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Empty Null Invalid Inputs

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  - Syntax
    
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- Default Parameters
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  - Right Side Only
    
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  - Effect
    
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  - Syntax
    
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  - Example
    
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  - Usage
    
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    htmlspecialchars with Named
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  - PHP 8.0
    
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  - Syntax
    
    funcName variable
  - Example
    
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  - Syntax
    
    function without name
  - Example
    
    assign to variable
  - Closure
    
    use keyword for scope
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  - PHP 7.4 Syntax
    
    fn param expression
  - Example
    
    fn a b a plus b
    
    fn x y x plus y
  - Implicit Return
    
    No return Keyword
  - PHP 7.4
    
    Short Closure Syntax
  - Parent Scope
    
    Automatic Variable Binding
  - No Multi Statement
    
    Single Expression Only
  - No Return Keyword
    
    Implicit Return
- Function Scope
  - Local Variables
    
    Inside Function Only
  - Global Access
    
    global Keyword
  - global Keyword Usage
    
    global varName
  - Example
    
    global count increment
- GLOBALS Array
  - $GLOBALS Usage
    
    Access Any Global
  - Example
    
    GLOBALS count increment
- Static Variables
  - static Keyword
    
    static counter
  - Behavior
    
    Persists Between Calls
  - Example
    
    countVisits Function
- Recursion
  - Definition
    
    Function Calls Itself
  - Example
    
    factorial Function
  - Limit
    
    Stack Overflow Risk
- Callback Functions
  - Definition
    
    Function as Parameter
  - call_user_func
    
    Call Callback Function
  - call_user_func_array
    
    Call with Array Parameters
  - is_callable
    
    Check if Callable
  - Closure Example
    
    Anonymous Function as Callback
  - Array Map Example
    
    Apply Callback to Array
  - Array Filter Example
    
    Filter with Callback
  - usort Example
    
    Sort with Callback
- Closure
  - Closure Class
    
    Represent Anonymous Function
  - bind Method
    
    Clone Closure with New This
  - bindTo Method
    
    Bind Closure to Object
  - call Method
    
    Call Closure Bound to Object
  - fromCallable Method
    
    Convert Callable to Closure
  - Use Case
    
    Event Handlers
    
    Currying Functions
- Variadic Functions
  - Three Dots Syntax
    
    Variable Length Arguments
  - Type Declaration
    
    Variadic with Type Hints
  - Example
    
    Sum Function
  - Before PHP 5.6
    
    func_num_args Method
  - func_num_args
    
    Count Arguments
  - func_get_arg
    
    Get Single Argument
  - func_get_args
    
    Get All Arguments
PHP Arrays
- Indexed Array
  - Definition
    
    Numeric Keys Start 0
  - array Function
    
    array Create Array
  - Short Syntax
    
    Square Brackets
  - Example
    
    $colors array red blue
  - Access Element
    
    $array index
  - Modify Element
    
    $array index new value
  - Add Element
    
    $array new index value
  - Automatic Index
    
    Largest Index Plus One
- Associative Array
  - Definition
    
    String Keys
  - array Function
    
    array key value
  - Short Syntax
    
    key value brackets
  - Example
    
    $user name John
  - Access Element
    
    $array key
  - Modify Element
    
    $array key new value
  - Add Element
    
    $array new key value
- Multidimensional Array
  - Definition
    
    Array Inside Array
  - Two Dimensional
    
    Matrix Structure
  - Three Dimensional
    
    Cube Structure
  - Access Element
    
    $array index index
  - Example
    
    Student Grades Matrix
  - Iteration
    
    Nested foreach Loops
- Array Functions
  - count Function
    
    Get Array Length
  - sizeof Alias
    
    Count Alias Function
  - array_push
    
    Add Element to End
  - array_pop
    
    Remove Element from End
  - array_shift
    
    Remove Element from Start
  - array_unshift
    
    Add Element to Start
  - array_merge
    
    Merge Multiple Arrays
  - array_merge_recursive
    
    Merge Nested Arrays
  - array_combine
    
    Keys and Values to Array
  - array_keys
    
    Get All Keys
  - array_values
    
    Get All Values
  - array_key_exists
    
    Check Key Exists
  - in_array
    
    Check Value Exists
  - array_search
    
    Search Value Return Key
  - array_reverse
    
    Reverse Array Order
  - array_slice
    
    Extract Portion of Array
  - array_splice
    
    Remove Replace Portion
  - array_unique
    
    Remove Duplicate Values
  - array_map
    
    Apply Function to Elements
  - array_filter
    
    Filter Elements by Callback
  - array_reduce
    
    Reduce to Single Value
  - array_sum
    
    Sum of Values
  - array_product
    
    Product of Values
  - array_rand
    
    Random Key from Array
  - shuffle
    
    Randomize Array Order
  - range
    
    Create Array of Range
  - array_fill
    
    Fill Array with Values
  - array_fill_keys
    
    Fill with Keys
  - array_pad
    
    Pad Array to Size
  - array_chunk
    
    Split into Chunks
- Sorting Functions
  - sort
    
    Sort Ascending
  - rsort
    
    Sort Descending
  - asort
    
    Sort Ascending Keep Keys
  - arsort
    
    Sort Descending Keep Keys
  - ksort
    
    Sort by Keys Ascending
  - krsort
    
    Sort by Keys Descending
  - usort
    
    Sort by User Function
  - uasort
    
    Sort Values User Keep Keys
  - uksort
    
    Sort Keys User Function
  - natsort
    
    Natural Order Sort
  - natcasesort
    
    Case Insensitive Natural Sort
- Array Destructuring
  - list Function
    
    Assign Values to Variables
  - list Example
    
    $list a b c
  - Short Syntax
    
    Brackets Assignment
  - Short Example
    
    a b c equals array
  - Skip Values
    
    Comma Without Variable
  - Associative Array
    
    Square Brackets with Keys
  - Nested
    
    Destructure Nested Arrays
- Spread Operator
  - Array Unpacking
    
    Three Dots Unpack
  - Example
    
    array merge with spread
  - String Keys
    
    Works with String Keys PHP 8.1
  - Duplicate Keys
    
    Last Key Overwrites
PHP Strings
- String Creation
  - Single Quotes
    
    Literal String
  - Double Quotes
    
    Parses Variables
  - Heredoc Syntax
    
    Multi-line String
  - Nowdoc Syntax
    
    No Parsing Heredoc
- String Functions
  - strlen
    
    Get String Length
  - str_word_count
    
    Count Words
  - strrev
    
    Reverse String
  - strpos
    
    Find Substring Position
  - stripos
    
    Case Insensitive strpos
  - strrpos
    
    Find Last Position
  - strripos
    
    Case Insensitive Last
  - substr
    
    Extract Substring
  - substr_replace
    
    Replace Substring
  - str_replace
    
    Replace All Occurrences
  - str_ireplace
    
    Case Insensitive Replace
  - str_repeat
    
    Repeat String
  - str_pad
    
    Pad String to Length
  - trim
    
    Strip Whitespace Both Ends
  - ltrim
    
    Strip Left Whitespace
  - rtrim
    
    Strip Right Whitespace
  - explode
    
    Split String into Array
  - implode
    
    Join Array into String
  - join
    
    Alias of implode
  - strtolower
    
    Convert to Lowercase
  - strtoupper
    
    Convert to Uppercase
  - ucfirst
    
    Uppercase First Character
  - ucwords
    
    Uppercase Each Word First
  - lcfirst
    
    Lowercase First Character
  - htmlspecialchars
    
    Convert Special Chars to Entities
  - htmlspecialchars_decode
    
    Convert Entities to Chars
  - htmlentities
    
    Convert All to Entities
  - html_entity_decode
    
    Convert Entities to Chars
  - strip_tags
    
    Remove HTML PHP Tags
  - addslashes
    
    Quote String with Slashes
  - stripslashes
    
    Unquote Quoted String
  - md5
    
    Calculate MD5 Hash
  - sha1
    
    Calculate SHA1 Hash
  - hash
    
    Hash String with Algorithm
  - base64_encode
    
    Encode with Base64
  - base64_decode
    
    Decode Base64 String
  - urlencode
    
    URL Encode String
  - urldecode
    
    Decode URL Encoded String
  - rawurlencode
    
    URL Encode RFC 3986
  - rawurldecode
    
    Decode RFC 3986 URL
  - json_encode
    
    Convert to JSON String
  - json_decode
    
    Convert JSON to Variable
  - serialize
    
    Convert Value to String
  - unserialize
    
    Restore Serialized String
  - parse_str
    
    Parse Query String
  - http_build_query
    
    Build Query String
- printf Functions
  - printf
    
    Formatted Output
  - sprintf
    
    Return Formatted String
  - sscanf
    
    Parse Formatted Input
  - vprintf
    
    Output with Array Arguments
  - vsprintf
    
    Return with Array Arguments
- String Comparison
  - strcmp
    
    Binary Safe Compare
  - strcasecmp
    
    Case Insensitive Compare
  - strncmp
    
    Compare First N Characters
  - strncasecmp
    
    Case Insensitive N Compare
  - strnatcmp
    
    Natural Order Compare
  - strnatcasecmp
    
    Natural Case Insensitive
  - similar_text
    
    Calculate Similarity
  - levenshtein
    
    Calculate Levenshtein Distance
- String Search
  - strstr
    
    Find First Occurrence
  - stristr
    
    Case Insensitive strstr
  - strchr
    
    Alias of strstr
  - strrchr
    
    Find Last Occurrence
  - strpbrk
    
    Search for Any Character
- String Tokenization
  - strtok
    
    Tokenize String
  - Example
    
    strtok with Multiple Tokens
- Regular Expressions
  - preg_match
    
    Perform Regex Match
  - preg_match_all
    
    Perform Global Match
  - preg_replace
    
    Search Replace Regex
  - preg_split
    
    Split by Regex
  - preg_grep
    
    Filter Array by Regex
  - preg_quote
    
    Escape Regex Characters
PHP Superglobals
- $_GET
  - Definition
    
    HTTP GET Parameters
  - Usage
    
    Retrieve Query String
  - Example
    
    Get name from URL
  - Security
    
    Validate and Sanitize
- $_POST
  - Definition
    
    HTTP POST Parameters
  - Usage
    
    Retrieve Form Data
  - Example
    
    Get username from form
  - Security
    
    Validate and Sanitize
- $_POST vs GET
  - POST for Sensitive Data
    
    Hidden from URL
  - GET for Search
    
    Visible in URL
- $_REQUEST
  - Definition
    
    GET POST COOKIE Combined
  - Usage
    
    Request Data Any Method
  - Caution
    
    Prefer Specific Variables
- $_SERVER
  - Definition
    
    Server Environment Variables
  - HTTP_USER_AGENT
    
    Browser Information
  - REMOTE_ADDR
    
    Client IP Address
  - REQUEST_METHOD
    
    HTTP Method GET POST
  - REQUEST_URI
    
    Requested URL Path
  - QUERY_STRING
    
    Query String Part
  - SCRIPT_NAME
    
    Script Path
  - PHP_SELF
    
    Current Script Filename
  - SERVER_NAME
    
    Server Hostname
  - SERVER_ADDR
    
    Server IP Address
  - SERVER_PORT
    
    Server Port Number
  - HTTP_REFERER
    
    Previous Page URL
  - HTTPS
    
    Check if HTTPS Enabled
  - HTTP_HOST
    
    Host Header Value
  - DOCUMENT_ROOT
    
    Web Root Directory
- $_FILES
  - Definition
    
    Uploaded Files Array
  - name
    
    Original File Name
  - type
    
    File MIME Type
  - tmp_name
    
    Temporary File Path
  - error
    
    Upload Error Code
  - size
    
    File Size Bytes
- $_COOKIE
  - Definition
    
    HTTP Cookies Array
  - Usage
    
    Retrieve Cookie Values
  - Example
    
    Get user preference
- $_SESSION
  - Definition
    
    Session Variables Array
  - Usage
    
    Store User Data
  - Example
    
    Store user ID
  - Start Required
    
    session_start First
- $GLOBALS
  - Definition
    
    All Global Variables
  - Usage
    
    Access Anywhere
  - Example
    
    GLOBALS var name
- $_ENV
  - Definition
    
    Environment Variables
  - Usage
    
    Access System Environment
PHP Forms
- Form Handling
  - GET Method
    
    Send Data in URL
  - POST Method
    
    Send Data in Body
  - action Attribute
    
    Form Submission URL
  - name Attribute
    
    Input Field Identifier
  - method Attribute
    
    GET or POST
  - enctype Attribute
    
    Multipart for Files
- Form Validation
  - Required Field
    
    Check Not Empty
  - Email Validation
    
    Validate Format
  - Number Validation
    
    Check Numeric
  - String Length
    
    Min Max Characters
  - Pattern Matching
    
    Regex Validation
  - URL Validation
    
    Valid URL Format
  - Date Validation
    
    Check Valid Date
  - File Validation
    
    Check Type Size
  - Confirm Password
    
    Check Match
  - Checkbox Validation
    
    At Least One
  - Select Validation
    
    Option Selected
- Form Security
  - htmlspecialchars
    
    Prevent XSS Attacks
  - strip_tags
    
    Remove HTML Tags
  - filter_var
    
    Validate Sanitize Data
  - Prepared Statements
    
    Prevent SQL Injection
  - CSRF Token
    
    Prevent Cross Site Request
  - CSRF Generation
    
    Unique Token per Session
  - CSRF Validation
    
    Verify Token on Submit
  - CAPTCHA
    
    Prevent Bot Submissions
  - reCAPTCHA
    
    Google CAPTCHA Integration
  - Honeypot
    
    Hidden Field Trap Bots
  - Rate Limiting
    
    Prevent Brute Force
  - Input Sanitization
    
    Remove Dangerous Characters
  - Output Escaping
    
    Escape Before Display
- Sticky Forms
  - Remember Values
    
    Keep After Submission
  - Select Dropdown
    
    Preselect Saved Value
  - Checkbox
    
    Remember Checked State
  - Radio Button
    
    Preserve Selected Option
- File Upload
  - Form Enctype
    
    multipart form data Required
  - max_file_size
    
    Hidden Field Limit
  - Upload Directory
    
    Destination Permissions
  - move_uploaded_file
    
    Safe Move from Temp
  - is_uploaded_file
    
    Check Valid Upload
  - File Type Validation
    
    Check MIME Type
  - File Extension
    
    Check Extension Whitelist
  - Image Validation
    
    getimagesize Check
  - File Size Validation
    
    Check Max Size
  - Secure Filename
    
    Remove Special Characters
  - Unique Filename
    
    uniqid or Timestamp
  - Error UPLOAD_ERR_OK
    
    No Error
  - Error UPLOAD_ERR_INI_SIZE
    
    Exceeds Max Size
  - Error UPLOAD_ERR_FORM_SIZE
    
    Exceeds Form Limit
  - Error UPLOAD_ERR_PARTIAL
    
    Partial Upload
  - Error UPLOAD_ERR_NO_FILE
    
    No File Uploaded
  - Error UPLOAD_ERR_NO_TMP_DIR
    
    Missing Temp Folder
  - Error UPLOAD_ERR_CANT_WRITE
    
    Write Failed
  - Error UPLOAD_ERR_EXTENSION
    
    Extension Stopped Upload
  - Multiple File Upload
    
    Array Syntax for Files
  - Image Resize
    
    GD Library Thumbnail
  - File Download
    
    Force Download Headers
PHP Sessions
- Session Introduction
  - What is Session
    
    Server Side User Storage
  - Session vs Cookie
    
    Server vs Client Storage
  - Session Lifecycle
    
    Start Use Destroy
- Session Functions
  - session_start
    
    Initialize Session
  - session_id
    
    Get Set Session ID
  - session_name
    
    Get Set Session Name
  - session_destroy
    
    Delete All Session Data
  - session_unset
    
    Free Session Variables
  - session_regenerate_id
    
    Prevent Session Fixation
  - session_status
    
    Check Session State
  - session_save_path
    
    Get Set Storage Path
- Session Security
  - Session Hijacking
    
    Use HTTPS Only
  - Session Fixation
    
    Regenerate After Login
  - Session Timeout
    
    Implement Expiry
  - Secure Cookie Flag
    
    HTTPS Only Cookie
  - HttpOnly Cookie
    
    No JavaScript Access
  - SameSite Cookie
    
    CSRF Protection
- Session Storage
  - Store User ID
    
    Authentication State
  - Store Preferences
    
    Theme Language Settings
  - Store Shopping Cart
    
    Cart Items in Session
- Session Examples
  - Login System
    
    Set Session After Auth
  - Logout System
    
    Destroy Session on Logout
  - User Dashboard
    
    Check Session for Access
PHP Cookies
- Cookie Introduction
  - What is Cookie
    
    Client Side Storage
- Cookie Attributes
  - name
    
    Identifier
  - value
    
    Stored Data
  - expires
    
    Expiry Timestamp
  - path
    
    Available Path
  - domain
    
    Available Domain
  - secure
    
    HTTPS Only
  - httponly
    
    No JavaScript Access
  - samesite
    
    Strict Lax None
- Cookie Functions
  - setcookie
    
    Send Cookie to Browser
  - setrawcookie
    
    Send Without URL Encoding
  - header Cookie
    
    Alternative Set-Cookie
- Cookie Examples
  - Remember Me
    
    Long Term Login
  - User Preferences
    
    Store Theme Language
  - Analytics
    
    Track User Visits
- Cookie Security
  - Encrypt Cookie Data
    
    Sensitive Information
PHP File Handling
- File Open
  - fopen
    
    Open File or URL
- File Open Mode
- File Read
  - fread
    
    Read Bytes from File
  - fgets
    
    Read Line from File
  - fgetc
    
    Read Single Character
  - file
    
    Read Entire File to Array
  - file_get_contents
    
    Read File to String
- File Write
  - fwrite
    
    Write String to File
  - fputs
    
    Alias of fwrite
  - file_put_contents
    
    Write String to File
- File Close
  - fclose
    
    Close File Pointer
- File End
  - feof
    
    Check End of File
- File Pointer
  - rewind
    
    Reset File Pointer
  - ftell
    
    Get Pointer Position
  - fseek
    
    Move Pointer Position
- File Info
  - filesize
    
    Get File Size
  - file_exists
    
    Check File Exists
  - is_file
    
    Check Regular File
  - is_dir
    
    Check Directory
  - is_readable
    
    Check Read Permission
  - is_writable
    
    Check Write Permission
  - filemtime
    
    Last Modified Time
  - filectime
    
    Change Time
  - fileatime
    
    Last Access Time
  - pathinfo
    
    Return Path Information
  - basename
    
    Get Filename from Path
  - dirname
    
    Get Directory from Path
  - realpath
    
    Resolve Canonical Path
- File Operations
  - copy
    
    Copy File
  - rename
    
    Move or Rename
  - unlink
    
    Delete File
  - chmod
    
    Change Permissions
  - chown
    
    Change Owner
  - chgrp
    
    Change Group
- Directory Operations
  - mkdir
    
    Create Directory
  - rmdir
    
    Remove Directory
  - opendir
    
    Open Directory Handle
  - readdir
    
    Read Directory Entry
  - closedir
    
    Close Directory Handle
  - scandir
    
    List Files in Directory
  - glob
    
    Find Paths Matching Pattern
- CSV Handling
  - fgetcsv
    
    Read CSV Line
  - fputcsv
    
    Write CSV Line
  - str_getcsv
    
    Parse CSV String
- JSON File
  - json_encode file
    
    Write JSON to File
  - file_get_contents json_decode
    
    Read JSON from File
PHP Date & Time
- Date Functions
  - date
    
    Format Current Time
  - time
    
    Unix Timestamp
  - mktime
    
    Timestamp from Date
  - gmmktime
    
    GMT Timestamp
  - strtotime
    
    Parse English to Timestamp
  - getdate
    
    Get Date Array
  - gettimeofday
    
    Get Current Time
  - checkdate
    
    Validate Gregorian Date
- Date Format
  - d
    
    Day 01 to 31
    
    3 Letter Weekday
  - m
    
    Month 01 to 12
    
    3 Letter Month
  - Y
    
    Year 4 Digits
    
    Year 2 Digits
  - H
    
    Hour 00 to 23
    
    Hour 01 to 12
  - i
    
    Minutes 00 to 59
  - s
    
    Seconds 00 to 59
  - a
    
    am or pm
  - l
    
    Full Weekday Name
  - F
    
    Full Month Name
- DateTime Class
  - DateTime Object
    
    OOP Date Handling
  - __construct
    
    Create DateTime Object
  - format
    
    Format DateTime
  - modify
    
    Modify with String
  - add
    
    Add DateInterval
  - sub
    
    Subtract DateInterval
  - diff
    
    Calculate Difference
  - setTimezone
    
    Change Timezone
  - getTimezone
    
    Get Current Timezone
  - setDate
    
    Set Date Values
  - setTime
    
    Set Time Values
  - createFromFormat
    
    Parse Custom Format
  - getTimestamp
    
    Get Unix Timestamp
  - setTimestamp
    
    Set from Timestamp
- DateInterval
  - DateInterval Class
    
    Time Interval
  - format
    
    Format Interval
  - createFromDateString
    
    Create from String
- DatePeriod
  - DatePeriod Class
    
    Iterate Date Range
  - Constructor
    
    Start End Interval
  - Recurring Dates
    
    Generate Recurring Dates
- DateTimeZone
  - DateTimeZone Class
    
    Timezone Handling
  - listIdentifiers
    
    List All Timezones
  - getOffset
    
    Get Timezone Offset
- Timezone Setting
  - date_default_timezone_set
    
    Set Default Timezone
  - date_default_timezone_get
    
    Get Default Timezone
- Time Calculations
  - Age Calculator
    
    Diff from Birthdate
  - Days Between Dates
    
    Using diff Method
  - Add Days
    
    modify plus 1 day
PHP Regular Expressions
- PREG Functions
  - preg_match
    
    Perform Regex Match
  - preg_match_all
    
    Perform Global Match
  - preg_replace
    
    Search Replace Regex
  - preg_replace_callback
    
    Replace with Callback
  - preg_split
    
    Split String by Pattern
  - preg_grep
    
    Filter Array by Pattern
  - preg_quote
    
    Escape Regex Characters
  - preg_last_error
    
    Get Last Regex Error
- Pattern Delimiters
  - Forward Slash
    
    / Delimiter
  - Hash Symbol
    
    # Delimiter
  - Tilde
    
    ~ Delimiter
- Metacharacters
  - Dot
    
    Any Single Character
  - Caret
    
    Start of String
  - Dollar
    
    End of String
  - Asterisk
    
    Zero or More Times
  - Plus
    
    One or More Times
  - Question Mark
    
    Zero or One Time
  - Curly Braces
    
    Exact Number of Times
- Character Classes
  - Square Brackets
    
    Any Character in Set
  - Negated Class
    
    Caret Inside Brackets
  - Range Hyphen
    
    A to Z Range
- Shortcut Classes
  - Digits
    
    d Character
  - Non Digits
    
    D Character
  - Word Characters
    
    w Character
  - Non Word
    
    W Character
  - Whitespace
    
    s Character
  - Non Whitespace
    
    S Character
- Modifiers
  - i Modifier
    
    Case Insensitive
  - m Modifier
    
    Multiline Mode
  - s Modifier
    
    Dot Matches Newline
  - x Modifier
    
    Ignore Whitespace
  - u Modifier
    
    UTF-8 Mode
- Groups
  - Capturing Group
    
    Parentheses Capture
  - Non Capturing Group
    
    (?: Pattern)
  - Named Group
    
    P Name Pattern
  - Backreference
    
    Number Reference
- Alternation
  - Vertical Bar
    
    OR Operator
- Lookahead
  - Positive Lookahead
    
    (?= Pattern)
  - Negative Lookahead
    
    (?! Pattern)
- Lookbehind
  - Positive Lookbehind
    
    (?<= Pattern)
  - Negative Lookbehind
    
    (?<! Pattern)
- Email Validation
  - Email Regex Pattern
    
    Validate Email Format
- URL Validation
  - URL Regex Pattern
    
    Validate URL Format
- Phone Validation
  - Phone Regex Pattern
    
    Validate Phone Number
- IP Validation
  - IP Address Regex
    
    Validate IPv4 IPv6
- Username Validation
  - Username Regex
    
    Alphanumeric Underscore
- Password Validation
  - Password Strength Regex
    
    Complex Password Pattern
PHP OOP
- Classes
  - class Keyword
    
    Define Class Blueprint
  - Class Naming
    
    PascalCase Convention
  - Example Class
    
    User Class Definition
- Objects
  - new Keyword
    
    Create Object Instance
  - Object Variable
    
    $object = new Class
  - Multiple Objects
    
    Multiple Instances Possible
- Properties
  - Property Declaration
    
    public protected private
  - Property Types
    
    Type Declaration PHP 7.4
  - Property Initialization
    
    Default Values
  - Nullable Properties
    
    Question Mark Type
  - Property Access
    
    Arrow Operator
  - Property Assignment
    
    object property value
- Methods
  - Method Declaration
    
    public protected private
  - Method Return Type
    
    colon type Declaration
  - Method Parameters
    
    Pass Values to Methods
  - Method Call
    
    object method name
  - Method Chaining
    
    return this for Fluent
- $this Keyword
  - $this Variable
    
    Current Object Reference
- $this Usage
  - Access Properties
    
    $this property
  - Call Methods
    
    $this method
- Constructor
  - __construct Method
    
    Automatically Called
  - Constructor Parameters
    
    Pass Initial Values
  - Constructor Promotion
    
    PHP 8 Declare Properties
  - Parent Constructor
    
    parent construct Call
- Destructor
  - __destruct Method
    
    Automatically Called
  - Use Cases
    
    Close Database Connections
    
    Free Resources
- Inheritance
  - extends Keyword
    
    Child Extends Parent
  - Parent Class
    
    Base Class Definition
  - Child Class
    
    Derived Class Definition
  - Method Override
    
    Child Redefines Parent Method
  - parent Keyword
    
    Access Parent Method
  - final Keyword
    
    Prevent Method Override
  - final Class
    
    Prevent Class Extension
  - Multiple Inheritance
    
    Not Allowed in PHP
- Visibility
  - public Keyword
    
    Access from Anywhere
  - protected Keyword
    
    Access Inside Class and Child
  - private Keyword
    
    Access Only Inside Class
  - Property Best Practices
    
    Private by Default
- Getters and Setters
  - Getter Method
    
    Return Private Property
  - Setter Method
    
    Set Private Property
  - Validation in Setter
    
    Validate Before Set
  - Readonly Property
    
    Only Getter No Setter
- Abstract Classes
  - abstract Keyword
    
    Cannot Instantiate
  - Abstract Method
    
    No Implementation Only Declaration
  - Concrete Method
    
    Full Implementation Allowed
  - Child Implementation
    
    Child Must Implement Abstract Methods
- Interfaces
  - interface Keyword
    
    Define Contract
  - implements Keyword
    
    Class Implements Interface
  - Multiple Interfaces
    
    Implement Multiple Interfaces
  - Interface Inheritance
    
    Interface Extends Interface
  - Interface Constants
    
    Constants in Interface
  - Abstract vs Interface
    
    When to Use Which
- Traits
  - trait Keyword
    
    Code Reuse Mechanism
  - use Keyword
    
    Import Trait into Class
  - Multiple Traits
    
    Use Multiple Traits
  - Conflict Resolution
    
    insteadof Operator
  - Alias Method
    
    as Operator Change Visibility
  - Trait Composition
    
    Trait Can Use Trait
  - Properties in Traits
    
    Traits Can Declare Properties
  - Abstract Methods
    
    Traits Can Require Methods
- Static Methods
  - static Keyword
    
    Call on Class Not Object
    
    Late Binding
  - Method Call
    
    ClassName method
  - self Keyword
    
    Early Binding
  - parent Keyword
    
    Call Parent Static
- Static Properties
  - static Property
    
    Shared Across Instances
  - Access Syntax
    
    ClassName dollar property
  - self Access
    
    self dollar property
  - static Access
    
    static dollar property
- Late Static Binding
  - static Resolution
    
    Runtime Class Name
  - get_called_class
    
    Get Late Static Class
- Magic Methods
  - __construct
    
    Object Constructor
  - __destruct
    
    Object Destructor
  - __get
    
    Access Undefined Property
  - __set
    
    Set Undefined Property
  - __isset
    
    Check Undefined Property
  - __unset
    
    Unset Undefined Property
  - __call
    
    Call Undefined Method
  - __callStatic
    
    Call Undefined Static Method
  - __toString
    
    String Representation
  - __invoke
    
    Object as Function
  - __clone
    
    Called on Clone
  - __sleep
    
    Serialize Properties
  - __wakeup
    
    Unserialize Reinitialize
  - __serialize
    
    Custom Serialization PHP 7.4
  - __unserialize
    
    Custom Unserialize PHP 7.4
  - __debugInfo
    
    Var Dump Custom Output
  - __set_state
    
    Var Export Handler
- Object Cloning
  - clone Keyword
    
    Create Object Copy
  - Shallow Copy
    
    Default Clone Behavior
  - Deep Copy
    
    Manual Clone Nested Objects
  - __clone Method
    
    Customize Clone Behavior
- Object Comparison
  - Equal Operator
    
    Compare Property Values
  - Identical Operator
    
    Compare Object Identity
- Object Serialization
  - serialize Function
    
    Convert Object to String
  - unserialize Function
    
    Restore Object from String
  - Serializable Interface
    
    Deprecated in PHP 8
- Namespaces
  - namespace Keyword
    
    Define Namespace
  - use Keyword
    
    Import Namespace Class
  - as Keyword
    
    Namespace Alias
  - Fully Qualified Name
    
    Backslash Global Namespace
  - Subnamespaces
    
    Nested Namespace Structure
  - Multiple Namespaces
    
    Same File Multiple Namespaces
  - Bracketed Syntax
    
    Namespace with Braces
  - PSR-4
    
    Autoloading Standard
- Anonymous Classes
  - new class
    
    Create One Off Object
  - Constructor
    
    Can Have Constructor
  - Extend Class
    
    Can Extend Other Classes
  - Implement Interface
    
    Can Implement Interfaces
  - Use Cases
    
    Simple Mock Objects
- Iterators
  - Iterator Interface
    
    Implement Custom Iteration
  - IteratorAggregate
    
    Return External Iterator
  - ArrayIterator
    
    Iterate Over Arrays
  - ArrayObject
    
    Treat Array as Object
- Generators
  - yield Keyword
    
    Generate Values On Demand
  - yield from
    
    Delegate Generation
  - Generator Object
    
    Send Throw GetReturn
  - Memory Efficiency
    
    Generate Large Datasets
- Reflection
  - ReflectionClass
    
    Inspect Class Information
  - ReflectionMethod
    
    Inspect Method Information
  - ReflectionProperty
    
    Inspect Property Information
  - ReflectionParameter
    
    Inspect Parameter Information
  - ReflectionAttribute
    
    PHP 8 Attribute Reflection
  - Use Cases
    
    Dependency Injection Containers
- Attributes
  - Attribute Syntax
    
    Hash Attribute PHP 8
  - Attribute Class
    
    Create Custom Attribute
  - Attribute Target
    
    Class Method Property Constant
  - Attribute Flags
    
    Attribute TARGET ALL
  - Repeatable Attribute
    
    Allow Multiple Same Attribute
  - Read Attributes
    
    Reflection API Access
- Enums
  - enum Keyword
    
    PHP 8.1 Enumerations
  - Basic Enum
    
    Simple Case Values
  - Backed Enum
    
    String or Int Backed Values
  - Enum Methods
    
    Enums Can Have Methods
  - Enum Static Methods
    
    Enums Have Static Methods
  - Enum Constants
    
    Enums Have Constants
  - Enum in Switch
    
    Use Enum in Switch Cases
  - Enum vs Class
    
    When to Use Enums
PHP Database
- MySQLi Introduction
  - MySQLi Extension
    
    MySQL Improved Extension
- MySQLi Connection
  - Procedural Connect
    
    mysqli_connect Function
  - OOP Connect
    
    new mysqli Constructor
  - Connection Parameters
    
    Host Username Password Database
  - Error Check
    
    mysqli_connect_error
  - Set Charset
    
    mysqli_set_charset UTF-8
  - Close Connection
    
    mysqli_close
- MySQLi Query
  - Simple Query
    
    mysqli_query Function
  - SELECT Query
    
    Fetch Data from Database
  - INSERT Query
    
    Add New Records
  - UPDATE Query
    
    Modify Existing Records
  - DELETE Query
    
    Remove Records
- MySQLi Fetch
  - mysqli_fetch_assoc
    
    Associative Array Fetch
  - mysqli_fetch_object
    
    Object Fetch
  - mysqli_fetch_array
    
    Both Types Fetch
  - mysqli_fetch_all
    
    Fetch All Rows
  - mysqli_num_rows
    
    Get Row Count
  - mysqli_affected_rows
    
    Affected Row Count
  - mysqli_insert_id
    
    Last Insert ID
- MySQLi Prepared
  - Prepared Statement Benefits
    
    Prevent SQL Injection
  - prepare Method
    
    Prepare SQL Statement
  - bind_param
    
    Bind Parameters
  - Parameter Types
    
    s i d b Strings Integer Double Blob
  - execute Method
    
    Execute Statement
  - store_result
    
    Store Result Set
  - bind_result
    
    Bind Result Columns
  - fetch Method
    
    Fetch Result Row
  - get_result
    
    Get Result Set Object
  - INSERT with Prepared
    
    Secure Insert Operation
  - UPDATE with Prepared
    
    Secure Update Operation
  - DELETE with Prepared
    
    Secure Delete Operation
  - SELECT with Prepared
    
    Secure Select Operation
- MySQLi Multi Query
  - multi_query
    
    Execute Multiple Queries
  - next_result
    
    Move to Next Result Set
- MySQLi Transactions
  - autocommit
    
    Disable Auto Commit
  - begin_transaction
    
    Start Transaction
  - commit
    
    Save All Changes
  - rollback
    
    Revert All Changes
  - Example
    
    Bank Money Transfer
- MySQLi Error
  - mysqli_error
    
    Get Last Error Message
  - mysqli_errno
    
    Get Last Error Code
  - mysqli_sqlstate
    
    Get SQL State Error
- MySQLi Escape
  - mysqli_real_escape_string
    
    Escape Special Characters
- PDO Introduction
  - PDO Extension
    
    PHP Data Objects
- PDO Benefits
  - Multiple Databases
    
    Supports 12 Drivers
- PDO vs MySQLi
  - PDO More Databases
    
    MySQLi MySQL Only
- PDO Connection
  - PDO Constructor
    
    Create PDO Instance
  - DSN String
    
    Data Source Name Format
  - MySQL DSN
    
    mysql host dbname
  - Connection Options
    
    Set PDO Attributes
  - Error Mode
    
    ERRMODE EXCEPTION
  - Connection Check
    
    Try Catch for Errors
  - Close Connection
    
    Set PDO to null
- PDO Query
  - query Method
    
    Single Query Execution
  - exec Method
    
    Returns Affected Rows
- PDO Fetch
  - PDO FETCH_ASSOC
    
    Associative Array Fetch
  - PDO FETCH_OBJ
    
    Object Fetch
  - PDO FETCH_BOTH
    
    Both Associative Indexed
  - PDO FETCH_CLASS
    
    Fetch into Class Instance
  - fetch Method
    
    Get Single Row
  - fetchAll Method
    
    Get All Rows
  - fetchColumn
    
    Get Single Column
  - rowCount
    
    Get Number of Rows
- PDO Prepared
  - prepare Method
    
    Prepare SQL Statement
  - bindParam
    
    Bind by Reference
  - bindValue
    
    Bind by Value
  - execute Method
    
    Execute Statement
  - Named Placeholders
    
    Colon Name Parameter Style
  - Question Mark Placeholders
    
    Positional Parameters
  - INSERT Prepared
    
    Secure Insert with PDO
  - UPDATE Prepared
    
    Secure Update with PDO
  - DELETE Prepared
    
    Secure Delete with PDO
  - SELECT Prepared
    
    Secure Select with PDO
  - Reuse Statement
    
    Execute Multiple Times
- PDO Transactions
  - beginTransaction
    
    Start Transaction PDO
  - commit
    
    Commit Transaction PDO
  - rollBack
    
    Rollback Transaction PDO
  - inTransaction
    
    Check if Active
- PDO Error
  - errorInfo
    
    Get Error Information Array
  - errorCode
    
    Get Error Code
  - PDOException
    
    Catch PDO Exceptions
- PDO Attributes
  - setAttribute
    
    Set PDO Attribute
  - getAttribute
    
    Get PDO Attribute
  - ATTR ERRMODE
    
    Error Reporting Mode
  - ATTR DEFAULT FETCH MODE
    
    Default Fetch Style
  - ATTR EMULATE PREPARES
    
    Emulated Prepares
- PDO Last ID
  - lastInsertId
    
    Get Last Inserted ID
- PDO Metadata
  - getColumnMeta
    
    Get Column Metadata
- PDO Drivers
  - getAvailableDrivers
    
    List Available Drivers
PHP Error Handling
- Error Types
  - PHP Parse Error
    
    Syntax Error Script Won't Run
  - PHP Fatal Error
    
    Script Execution Stops
  - PHP Warning
    
    Continues but Warning Shown
  - PHP Notice
    
    Minor Issue Continues
  - PHP Deprecated
    
    Feature Will Be Removed
- Error Reporting
  - error_reporting
    
    Set Error Level
  - display_errors
    
    Show Errors in Browser
  - log_errors
    
    Log Errors to File
- Error Levels
  - E_ALL
    
    All Errors and Warnings
  - E_ERROR
    
    Fatal Runtime Errors
  - E_WARNING
    
    Runtime Warnings
  - E_PARSE
    
    Compile Time Parse Errors
  - E_NOTICE
    
    Runtime Notices
  - E_DEPRECATED
    
    Deprecated Code Warnings
  - E_STRICT
    
    Strict Standards
- Custom Handler
  - set_error_handler
    
    User Defined Error Handler
  - Handler Parameters
    
    errno errstr errfile errline
  - restore_error_handler
    
    Restore Previous Handler
- Exception Handling
  - try Block
    
    Code That May Throw Exception
  - catch Block
    
    Handle Exception
  - finally Block
    
    Always Executes
- Exception Class
  - Throwable Interface
    
    Base Exception Interface
  - Exception Class
    
    Base Exception Class
  - throw Keyword
    
    Throw Exception Manually
- Exception Methods
  - getMessage
    
    Get Exception Message
  - getCode
    
    Get Exception Code
  - getFile
    
    Get File Where Thrown
  - getLine
    
    Get Line Where Thrown
  - getTrace
    
    Get Stack Trace Array
  - getTraceAsString
    
    Get Stack Trace String
- Custom Exceptions
  - Extend Exception
    
    Create Custom Exception Types
  - Multiple Types
    
    Handle Different Exceptions
  - Exception Hierarchies
    
    Parent Child Exceptions
- Multiple Catch
  - Catch Multiple
    
    Different Exception Types
  - Catch All
    
    Catch Throwable Interface
- Rethrow
  - throw in catch
    
    Rethrow with Different Type
- Exception Chaining
  - Previous Exception
    
    Pass Previous to Constructor
- Global Handler
  - set_exception_handler
    
    Uncaught Exception Handler
  - restore_exception_handler
    
    Restore Previous Handler
- Error to Exception
  - ErrorException Class
    
    Convert Errors to Exceptions
  - Handler Throw
    
    Throw ErrorException in Handler
- Production Practices
  - Error Logging
    
    Log Don't Display
  - Custom Error Page
    
    User Friendly Messages
  - Error Monitoring
    
    Sentry Bugsnag Integration
PHP Security
- SQL Injection
  - Overview
    
    What is SQL Injection
  - Vulnerable Code
    
    Direct Variable in Query
  - Prevention Method
    
    Use Prepared Statements
  - PDO Prevention
    
    Use PDO with Prepares
  - MySQLi Prevention
    
    Use MySQLi Prepared
  - Escape Function
    
    mysqli_real_escape_string Usage
  - Validation Method
    
    Validate All User Inputs
  - Stored Procedure
    
    Safe Stored Procedure Usage
- XSS Prevention
  - Overview
    
    What is Cross Site Scripting
  - htmlspecialchars
    
    Convert Special Characters
  - ENT_QUOTES Flag
    
    Convert Both Quotes
  - strip_tags Function
    
    Remove HTML PHP Tags
  - filter_var Sanitize
    
    Sanitize String Filter
  - Output Escaping
    
    Escape Before Display
  - CSP Header
    
    Content Security Policy
  - Cookie Flag
    
    HttpOnly Cookie Prevention
- CSRF Prevention
  - Overview
    
    What is CSRF Attack
  - Token Generation
    
    bin2hex random_bytes
  - Store Token
    
    Store in Session
  - Form Field
    
    Add Hidden Input Field
  - Validate Token
    
    Compare with Session
  - hash_equals Function
    
    Timing Safe Comparison
  - SameSite Cookie
    
    Cookie SameSite Strict
  - Double Submit
    
    Alternative CSRF Protection
  - Referer Check
    
    Verify HTTP Referer Header
- Password Hashing
  - password_hash Function
    
    Create Secure Hash
  - password_verify Function
    
    Verify Password
  - password_needs_rehash
    
    Check Rehash Needed
  - password_get_info
    
    Get Hash Algorithm Info
  - PASSWORD_DEFAULT
    
    Default BCrypt Algorithm
  - PASSWORD_BCRYPT
    
    BCrypt Algorithm
  - PASSWORD_ARGON2I
    
    Argon2i Algorithm
  - PASSWORD_ARGON2ID
    
    Argon2id Algorithm
  - BCrypt Cost
    
    Set Cost Parameter
  - Argon2 Memory
    
    Memory Cost Parameter
  - Argon2 Time
    
    Time Cost Parameter
  - Argon2 Threads
    
    Threads Parameter
  - Hash Length
    
    BCrypt 60 Characters
  - Best Practice
    
    Always Hash Passwords
- Input Validation
  - filter_var Function
    
    Validate and Sanitize
  - FILTER_VALIDATE_EMAIL
    
    Validate Email Format
  - FILTER_VALIDATE_URL
    
    Validate URL Format
  - FILTER_VALIDATE_IP
    
    Validate IP Address
  - FILTER_VALIDATE_INT
    
    Validate Integer
  - FILTER_VALIDATE_BOOLEAN
    
    Validate Boolean
  - FILTER_VALIDATE_FLOAT
    
    Validate Float
  - FILTER_VALIDATE_REGEXP
    
    Validate with Regex
  - FILTER_SANITIZE_EMAIL
    
    Sanitize Email String
  - FILTER_SANITIZE_URL
    
    Sanitize URL String
  - FILTER_SANITIZE_NUMBER_INT
    
    Remove Non Numeric
  - FILTER_SANITIZE_NUMBER_FLOAT
    
    Remove Non Float
  - FILTER_SANITIZE_SPECIAL_CHARS
    
    HTML Encode String
  - filter_input Function
    
    Filter from Superglobal
  - filter_input_array
    
    Filter Multiple Inputs
  - Validation vs Sanitization
    
    Reject vs Clean
- File Upload Security
  - Type Validation
    
    Check MIME Type
  - finfo_file Function
    
    Get Real MIME Type
  - Extension Whitelist
    
    Allow Specific Extensions
  - Image Validation
    
    getimagesize Function
  - Size Limit
    
    Check Maximum File Size
  - Secure Filename
    
    preg_replace Dangerous Chars
  - Unique Name
    
    uniqid Generation
  - Storage Location
    
    Outside Webroot Directory
  - File Permissions
    
    chmod 644 for Files
  - Serve File
    
    Readfile for Access Control
  - Malware Scan
    
    ClamAV Integration
- Session Security
  - Session Hijacking
    
    Use HTTPS Only
  - Regenerate ID
    
    session_regenerate_id After Login
  - Session Timeout
    
    Implement Idle Timeout
  - Secure Cookie Flag
    
    Set Secure Flag
  - HttpOnly Cookie Flag
    
    Set HttpOnly Flag
  - SameSite Cookie Flag
    
    Set SameSite Flag
  - Disable Trans ID
    
    Prevent URL Session ID
  - Database Storage
    
    Use Database for Sessions
  - Validation Method
    
    Check User Agent IP
- HTTPS
  - Force HTTPS
    
    Redirect HTTP to HTTPS
  - HSTS Header
    
    Strict Transport Security
  - Secure Flag Cookies
    
    Set-Cookie Secure Flag
  - Proxy Support
    
    HTTP X Forwarded Proto
- HTTP Headers
  - X-Frame-Options
    
    Prevent Clickjacking
  - X-Content-Type-Options
    
    Prevent MIME Sniffing
  - Referrer-Policy
    
    Control Referrer Information
  - Permissions-Policy
    
    Browser Feature Restrictions
- CSP Header
  - Content-Security-Policy
    
    Whitelist Resource Sources
  - default-src
    
    Fallback Source Policy
  - script-src
    
    Allowed Script Sources
  - style-src
    
    Allowed Style Sources
  - img-src
    
    Allowed Image Sources
  - connect-src
    
    Allowed API Endpoints
  - report-uri
    
    Report Violations URL
- CORS
  - Overview
    
    Cross Origin Resource Sharing
  - Allow Origin
    
    Access-Control-Allow-Origin Header
  - Allow Methods
    
    Access-Control-Allow-Methods Header
  - Allow Headers
    
    Access-Control-Allow-Headers Header
  - Allow Credentials
    
    Access-Control-Allow-Credentials Header
  - Preflight Request
    
    OPTIONS Method Handling
- API Security
  - Rate Limiting
    
    Prevent Brute Force
  - JWT Authentication
    
    JSON Web Tokens
  - API Keys
    
    Generate and Validate Keys
  - OAuth 2.0
    
    Third Party Authentication
  - Input Validation
    
    Validate All API Inputs
  - Output Sanitization
    
    Sanitize JSON Responses
- Environment Security
  - .env Files
    
    Store Secrets Outside Code
  - getenv Function
    
    Access Environment Variables
  - putenv Function
    
    Set Environment Variable
- Production Security
  - display_errors Off
    
    Don't Show Errors to Users
  - log_errors On
    
    Log Errors to File
  - error_log Path
    
    Set Error Log Location
  - Custom Error Page
    
    User Friendly Error Display
- SSRF Prevention
  - What is SSRF
    
    Server Side Request Forgery
  - Allowlist URLs
    
    Trusted Domain List
  - Disable Redirects
    
    Prevent Location Spoofing
  - Validate IP Address
    
    Block Internal IPs
  - cURL Options
    
    CURLOPT_REDIR_PROTOCOLS
  - Practical Example
    
    Safe URL Fetcher
- XXE Prevention
  - What is XXE
    
    XML External Entity Attack
  - libxml_disable_entity_loader
    
    Disable External Entities
  - libxml_set_external_entity_loader
    
    Disable Loading
  - DOMParser Options
    
    Disable Entity Loading
  - SimpleXML Options
    
    Safe XML Parsing
  - Practical Example
    
    Safe XML Loader
- Path Traversal
  - What is Path Traversal
    
    Directory Traversal Attack
  - realpath Validation
    
    Resolve Canonical Path
  - basename Function
    
    Extract Safe Filename
  - Path Whitelist
    
    Allowed Directories Only
  - Practical Example
    
    Safe File Reader
- Log Forging
  - What is Log Forging
    
    Injection in Log Files
  - Remove Newlines
    
    Sanitize Log Input
  - JSON Encoding
    
    Encode Special Characters
  - Practical Example
    
    Safe Logger Function
- LDAP Injection
  - What is LDAP Injection
    
    LDAP Query Attack
  - ldap_escape Function
    
    Escape LDAP Special Chars
  - Input Validation
    
    Validate Before Query
  - Practical Example
    
    Safe LDAP Search
PHP JSON
- json_encode
  - Basic Usage
    
    Convert PHP to JSON
  - PRETTY PRINT
    
    JSON_PRETTY_PRINT Flag
  - UNESCAPED UNICODE
    
    JSON_UNESCAPED_UNICODE Flag
  - UNESCAPED SLASHES
    
    JSON_UNESCAPED_SLASHES Flag
  - NUMERIC CHECK
    
    JSON_NUMERIC_CHECK Flag
  - FORCE OBJECT
    
    JSON_FORCE_OBJECT Flag
  - THROW ERROR
    
    JSON_THROW_ON_ERROR Flag
- json_decode
  - Basic Usage
    
    Convert JSON to PHP
  - Associative True
    
    Return Array Not Object
  - Depth Limit
    
    Maximum Nesting Depth
  - BigInt String
    
    JSON_BIGINT_AS_STRING Flag
- Error Constants
  - JSON_ERROR_NONE
    
    No Error Occurred
  - JSON_ERROR_DEPTH
    
    Maximum Depth Exceeded
  - JSON_ERROR_STATE_MISMATCH
    
    Invalid JSON Format
  - JSON_ERROR_CTRL_CHAR
    
    Control Character Error
  - JSON_ERROR_SYNTAX
    
    Syntax Error
  - JSON_ERROR_UTF8
    
    Malformed UTF-8 Characters
- File Handling
  - Read JSON File
    
    file_get_contents with decode
  - Write JSON File
    
    encode with file_put_contents
  - Pretty Print File
    
    Human Readable JSON Storage
- Validation
  - Validate JSON String
    
    Check decode not null
- Nested JSON
  - Complex Structures
    
    Handle Nested JSON Data
- Object Serialization
  - Serialize Objects
    
    Convert Objects to JSON
- Array Handling
  - Numeric Arrays
    
    Indexed Arrays to JSON
  - Associative Arrays
    
    Key Value to JSON
PHP XML
- SimpleXML
  - Load from File
    
    simplexml_load_file Function
  - Load from String
    
    simplexml_load_string Function
  - Access Elements
    
    Object Property Access
  - Access Attributes
    
    Attribute Array Access
  - Iterate Elements
    
    foreach Loop on SimpleXML
  - XPath Query
    
    xpath Method Query
  - Modify Elements
    
    Assign New Values
  - Add Child Element
    
    addChild Method
  - Add Attribute
    
    addAttribute Method
  - Remove Element
    
    unset on SimpleXML
  - Convert to String
    
    asXML Method
  - Namespaces
    
    Handling XML Namespaces
  - Get Children
    
    children Method
  - Get Attributes
    
    attributes Method
- DOMDocument
  - Load XML String
    
    loadXML Method
  - Load HTML String
    
    loadHTML Method
  - Load HTML File
    
    loadHTMLFile Method
  - Save XML
    
    saveXML Method
  - Save HTML
    
    saveHTML Method
  - Create Element
    
    createElement Method
  - Create Text Node
    
    createTextNode Method
  - Create Attribute
    
    createAttribute Method
  - Append Child
    
    appendChild Method
  - Insert Before
    
    insertBefore Method
  - Remove Child
    
    removeChild Method
  - Get Element ID
    
    getElementById Method
  - Get Elements Tag
    
    getElementsByTagName Method
- DOMXPath
  - Create Query
    
    DOMXPath Constructor
  - Execute Query
    
    evaluate Method
- XMLReader
  - Open File
    
    xmlreader open Method
  - Read Node
    
    xmlreader read Method
  - Get Node Type
    
    nodeType Property
  - Get Node Name
    
    name Property
  - Get Node Value
    
    value Property
- XMLWriter
  - Open Memory
    
    openMemory Method
  - Start Document
    
    startDocument Method
  - Start Element
    
    startElement Method
  - Write Element
    
    writeElement Method
  - Write Attribute
    
    writeAttribute Method
  - Write Text
    
    text Method
  - End Element
    
    endElement Method
  - End Document
    
    endDocument Method
  - Get Output
    
    outputMemory Method
PHP cURL
- cURL
  - Introduction
    
    Client URL Library
  - Initialize
    
    curl_init Function
  - Set Option
    
    curl_setopt Function
  - Execute Request
    
    curl_exec Function
  - Close Session
    
    curl_close Function
  - Get Error
    
    curl_error Function
  - Get Error Number
    
    curl_errno Function
  - Get Info
    
    curl_getinfo Function
- Options
  - CURLOPT_URL
    
    Set Request URL
  - CURLOPT_RETURNTRANSFER
    
    Return as String
  - CURLOPT_HEADER
    
    Include Headers Output
  - CURLOPT_TIMEOUT
    
    Request Timeout Seconds
  - CURLOPT_FOLLOWLOCATION
    
    Follow Redirects
  - CURLOPT_MAXREDIRS
    
    Maximum Redirects
- HTTP Methods
  - GET Request
    
    Default cURL Method
  - POST Request
    
    CURLOPT_POST Set True
  - POST Fields
    
    CURLOPT_POSTFIELDS
  - POST Array
    
    HTTP POST Form Data
  - POST JSON
    
    JSON with Content-Type
  - PUT Request
    
    CURLOPT_CUSTOMREQUEST PUT
  - DELETE Request
    
    CURLOPT_CUSTOMREQUEST DELETE
- Headers
  - HTTP Headers
    
    CURLOPT_HTTPHEADER Array
  - Content-Type
    
    application/json Header
  - Authorization
    
    Bearer Token Header
  - User Agent
    
    CURLOPT_USERAGENT
- SSL
  - SSL Verification
    
    CURLOPT_SSL_VERIFYPEER
  - Disable SSL Verify
    
    Only for Development
- Authentication
  - HTTP Basic Auth
    
    CURLOPT_USERPWD
- Proxy
  - HTTP Proxy
    
    CURLOPT_PROXY
  - Proxy Authentication
    
    CURLOPT_PROXYUSERPWD
- Cookies
  - Save Cookies
    
    CURLOPT_COOKIEJAR
  - Read Cookies
    
    CURLOPT_COOKIEFILE
- File Upload
  - Upload File
    
    CURLFile Class
- Concurrent
  - Multi Init
    
    curl_multi_init
  - Add Handle
    
    curl_multi_add_handle
  - Execute Multi
    
    curl_multi_exec
  - Select Multi
    
    curl_multi_select
  - Get Content
    
    curl_multi_getcontent
  - Remove Handle
    
    curl_multi_remove_handle
  - Close Multi
    
    curl_multi_close
- REST API
  - GET Request
    
    Fetch Data from API
  - POST Request
    
    Create Resource via API
  - PUT Request
    
    Update Resource via API
  - DELETE Request
    
    Delete Resource via API
- API Authentication
  - Bearer Token
    
    Authorization Bearer Header
  - API Key
    
    X-API-Key Header
PHP API Development
- REST API
  - Definition
    
    Representational State Transfer
- REST Methods
  - HTTP Methods
    
    GET POST PUT PATCH DELETE
- API Endpoints
  - URL Structure
    
    Resource Based URLs
- API Response
  - JSON Format
    
    JSON Response Standard
- Status Codes
  - 200 OK
    
    Success Response
  - 201 Created
    
    Resource Created
  - 400 Bad Request
    
    Client Error
  - 401 Unauthorized
    
    Authentication Required
  - 403 Forbidden
    
    Access Denied
  - 404 Not Found
    
    Resource Missing
  - 422 Unprocessable
    
    Validation Failed
  - 500 Server Error
    
    Internal Server Error
- Response Structure
  - Success Field
    
    Indicate Success Status
  - Message Field
    
    Human Readable Message
  - Data Field
    
    Response Data
  - Errors Field
    
    Validation Errors
- API Versioning
  - URL Versioning
    
    /v1/api/resource
  - Header Versioning
    
    Accept Header Version
- API Authentication
  - API Keys
    
    Simple Token Authentication
  - JWT Tokens
    
    JSON Web Token Auth
- JWT
  - Create Token
    
    Generate JWT Token
  - Validate Token
    
    Verify Token Signature
  - PHP Library
    
    firebase/php-jwt Package
- Rate Limiting
  - Implementation
    
    Throttling Requests
  - Headers
    
    X-RateLimit-Limit Header
    
    X-RateLimit-Remaining Header
    
    X-RateLimit-Reset Header
- Pagination
  - Limit Offset
    
    limit offset Parameters
  - Page Parameter
    
    page per_page Parameters
  - Response Metadata
    
    total pages next previous
- Filtering
  - Filter Parameters
    
    Filter by Field Values
- Sorting
  - Sort Parameters
    
    sort_by sort_order
- Searching
  - Search Parameter
    
    q or search Parameter
- API Documentation
  - OpenAPI Specification
    
    Swagger Documentation
- API Testing
  - Postman Tool
    
    Test API Endpoints
- CORS Handling
  - Cross Origin
    
    Handle CORS Headers
- Error Handling
  - Consistent Format
    
    Standard Error Response
- Validation
  - Request Validation
    
    Validate Input Data
- Logging
  - API Logs
    
    Log Requests and Responses
PHP Email
- mail Function
  - Basic Usage
    
    Send Simple Email
  - Parameters
    
    To Subject Message Headers
  - Headers Format
    
    From CC BCC Reply-To
  - Return Value
    
    True if Accepted
  - Additional Headers
    
    Carriage Return Line Feed
  - Plain Text Email
    
    Simple Text Email Example
  - HTML Email
    
    Content-Type text/html Header
  - HTML Images
    
    Embed Images with CID
  - Limitations
    
    May Go to Spam Folder
  - SMTP Config
    
    php.ini SMTP Settings
- PHPMailer
  - Introduction
    
    PHP Email Library
  - Installation
    
    Composer require phpmailer
  - SMTP Setup
    
    isSMTP Method
  - SMTP Host
    
    Host Property
  - SMTP Auth
    
    SMTPAuth Property
  - SMTP Username
    
    Username Property
  - SMTP Password
    
    Password Property
  - SMTP Secure
    
    SMTPSecure Property TLS SSL
  - SMTP Port
    
    Port Property 587 or 465
  - Set From
    
    setFrom Method
  - Add Recipient
    
    addAddress Method
  - Add CC
    
    addCC Method
  - Add BCC
    
    addBCC Method
  - Reply To
    
    addReplyTo Method
  - Email Subject
    
    Subject Property
  - Email Body
    
    Body Property HTML
  - Alt Body
    
    AltBody Property Plain Text
  - Add Attachment
    
    addAttachment Method
  - HTML Format
    
    isHTML Method
  - Send Email
    
    send Method
  - Error Info
    
    ErrorInfo Property
  - Gmail Setup
    
    Gmail SMTP Configuration
  - Outlook Setup
    
    Outlook SMTP Settings
  - String Attachment
    
    addStringAttachment Method
  - Embed Image
    
    addEmbeddedImage Method
- Email Validation
  - Validate Format
    
    Validate Email Address
- Email Verification
  - Send Link
    
    Send Verification Link
- Email Templates
  - HTML Design
    
    HTML Email Template
- Email Queue
  - Database Queue
    
    Bulk Email Queue
- Rate Limiting
  - Prevent Spam
    
    Email Rate Limits
- SwiftMailer
  - Alternative Library
    
    SwiftMailer Package
PHP 8 Features
- Constructor Promotion
  - Property Promotion
    
    Declare Properties in Constructor
  - Syntax
    
    public __construct public name
  - Visibility
    
    public private protected
- Named Arguments
  - Parameter Names
    
    Call with Parameter Names
  - Example
    
    array_fill start_index 0
  - Any Order
    
    Parameters Any Order
- Attributes
  - Syntax
    
    Hash Attribute Name
  - Create Class
    
    Create Attribute Class
  - Target
    
    Attribute Target Flags
  - Repeatable
    
    Allow Multiple Attributes
- Match Expression
  - Match Syntax
    
    Switch Replacement Returns Value
  - Strict Comparison
    
    Triple Equal Match
  - Default Pattern
    
    Match Default Case
  - Multiple Conditions
    
    Comma Separated Conditions
- Nullsafe Operator
  - Nullsafe Syntax
    
    Question Mark Arrow
  - Chaining
    
    user address city Chaining
- Union Types
  - Union Syntax
    
    int string float
  - Nullable Union
    
    int null Type
  - Example
    
    int|string|float
- Weak Map
  - WeakMap Class
    
    Weak Reference Map
- Stringable
  - Stringable Interface
    
    toString Implementation
- String Functions
  - str_contains
    
    Check String Contains Substring
  - str_starts_with
    
    Check String Starts With
  - str_ends_with
    
    Check String Ends With
- Debug Functions
  - get_debug_type
    
    Get Better Type Name
  - get_resource_id
    
    Get Resource ID
- Throw Expression
  - Throw in Expression
    
    Throw Exception in One Line
PHP 8.1 Features
- Enums
  - Enum Keyword
    
    PHP 8.1 Enumerations
  - Pure Enum
    
    enum Suit case Hearts
  - Backed Enum
    
    enum Status string case Pending
  - Enum Methods
    
    Enums Can Have Methods
  - Enum Constants
    
    Enums Can Have Constants
  - Enum in Switch
    
    Use Enum in Switch Cases
  - From Method
    
    BackedEnum from Value
  - TryFrom Method
    
    Returns Null if Invalid
- Readonly Properties
  - Readonly Keyword
    
    Property Write Once
- Readonly Class
  - Readonly Class
    
    All Properties Readonly
- First Class Callable
  - Callable Syntax
    
    fnName Three Dots
- Array Unpacking
  - String Keys
    
    String Keys Support
- Never Type
  - Never Return Type
    
    Function Never Returns
- Fibers
  - Fiber Introduction
    
    Lightweight Concurrency
  - Fiber Start
    
    new Fiber start
  - Fiber Resume
    
    resume Method
  - Fiber Return
    
    getReturn Method
- Array Functions
  - array_is_list
    
    Check if List Array
- Final Constants
  - final Keyword
    
    Final Class Constants
- Intersection Types
  - Intersection Syntax
    
    Countable Traversable
PHP 8.2 Features
- Readonly Classes
  - Readonly Class
    
    All Properties Readonly
- DNF Types
  - Complex Types
    
    Union Intersection Combination
- Trait Constants
  - Constants in Traits
    
    Traits Can Have Constants
- Random Extension
  - Randomizer Class
    
    New Random Generator
PHP 8.3 Features
- Class Constant Typing
  - Constant Types
    
    Type Declaration for Constants
- Dynamic Constant Fetch
  - Class Constant Fetch
    
    Dynamic Class Constant Access
- json_validate
  - Validate JSON
    
    Check JSON Without Parsing
PHP 8.4 Features
- Property Hooks
  - Get Set Hooks
    
    get set Property Hooks
- Asymmetric Visibility
  - Public Get Private Set
    
    Different Read Write Visibility
- Array Functions
  - array_find
    
    Find Element by Callback
  - array_find_key
    
    Find Key by Callback
  - array_any
    
    Check Any Element Matches
  - array_all
    
    Check All Elements Match
PHP Composer
- Introduction
  - What is Composer
    
    Dependency Manager for PHP
  - Package Manager
    
    Manage PHP Libraries
  - Inspiration
    
    Inspired by npm and bundler
- Installation
  - Download Composer
    
    Get composer.phar File
  - Global Install
    
    Mov to usr local bin
  - Windows Installer
    
    Download Composer Setup Exe
  - Verify Install
    
    composer Command Check
- composer.json
  - Create File
    
    composer init Command
  - Name Field
    
    vendor project Format
  - Description Field
    
    Package Description Text
  - Type Field
    
    library project metapackage
  - License Field
    
    Open Source License Name
  - Authors Field
    
    Developer Information Array
  - Require Field
    
    Production Dependencies List
  - Require Dev Field
    
    Development Dependencies List
  - Autoload Field
    
    PSR-4 Namespace Mapping
  - Autoload Dev Field
    
    Development Autoload Rules
  - Scripts Field
    
    Composer Hooks Definition
  - Minimum Stability
    
    Allow dev beta rc stable
  - Prefer Stable
    
    Prefer Stable Packages Flag
- Version Constraints
  - Exact Version
    
    1.2.3 Exact Match
  - Caret Range
    
    ^1.0 Allows 1.x
  - Tilde Range
    
    ~1.2 Allows 1.2.x
  - Hyphen Range
    
    1.0 - 2.0 Range
  - Wildcard Version
    
    1.0.* Wildcard
  - Greater Than
    
    >=1.0 Minimum Version
  - Less Than
    
    <2.0 Maximum Version
  - Dev Versions
    
    dev-master Development
  - Stability Flags
    
    @dev @beta @rc
- Commands
  - composer install
    
    Install from Lock File
  - composer update
    
    Update to Latest Versions
  - composer require
    
    Add New Package
  - composer require dev
    
    Add Dev Package
  - composer remove
    
    Remove Package
  - composer show
    
    Show Package Information
  - composer outdated
    
    Show Outdated Packages
  - composer why
    
    Show Why Package Installed
  - composer validate
    
    Validate composer.json File
  - composer dump-autoload
    
    Regenerate Autoloader
  - composer clear-cache
    
    Clear Composer Cache
  - composer self-update
    
    Update Composer Version
- composer.lock
  - Lock File Purpose
    
    Pin Exact Package Versions
  - Commit Lock File
    
    Commit to Version Control
  - Version Control
    
    Ensure Same Versions Everywhere
- vendor Directory
  - Third Party Code
    
    All Dependencies Here
  - autoload.php
    
    Include for Autoloading
  - Do Not Commit
    
    Add to gitignore
- Autoloading
  - PSR-4 Standard
    
    Namespace to Directory Mapping
  - PSR-4 Config
    
    App Backslash App Directory
  - PSR-0 Standard
    
    Deprecated Autoload Standard
  - Classmap Autoload
    
    Legacy Libraries Support
  - Files Autoload
    
    Global Helper Functions
  - Dump Autoload
    
    Regenerate After Changes
- Packagist
  - Official Repository
    
    Packagist.org Website
  - Search Packages
    
    Find PHP Libraries
  - Submit Package
    
    Publish Your Library
- Custom Repository
  - VCS Repository
    
    Git GitHub Bitbucket
  - Path Repository
    
    Local Development Package
  - Pear Repository
    
    Legacy PEAR Packages
- Scripts
  - Pre Install Cmd
    
    Before Install Hook
  - Post Install Cmd
    
    After Install Hook
  - Pre Update Cmd
    
    Before Update Hook
  - Post Update Cmd
    
    After Update Hook
  - Pre Autoload Dump
    
    Before Autoload Generation
  - Post Autoload Dump
    
    After Autoload Generation
  - Pre Package Install
    
    Before Package Install
  - Post Package Install
    
    After Package Install
  - Execute PHP Script
    
    @php runner php
  - Execute Composer
    
    @composer command
- Creating Package
  - composer.json Requirements
    
    Name and Description Required
  - Add Version
    
    Version Field or Git Tag
  - Packagist Submission
    
    Submit to Packagist
  - Autoload Setup
    
    PSR-4 Configuration
- Optimization
  - Classmap Optimization
    
    #NAME?
  - APCu Autoloader
    
    apcu-autoloader Flag
  - Production Build
    
    Use Optimized Autoloader
PHP Unit Testing
- PHPUnit
  - Introduction
    
    Unit Testing Framework
  - Installation
    
    Composer require phpunit
  - Version
    
    PHPUnit 10 for PHP 8.1
  - Test Class
    
    Extend TestCase Class
  - Test Method
    
    public function testMethod
  - Test Naming
    
    test Prefix Convention
  - Test Annotation
    
    @test Annotation Alternative
- Assertions
  - assertEquals
    
    Expected vs Actual Value
  - assertSame
    
    Strict Type Comparison
  - assertTrue
    
    Check Condition True
  - assertFalse
    
    Check Condition False
  - assertNull
    
    Check Value is Null
  - assertNotNull
    
    Check Value Not Null
  - assertEmpty
    
    Check Value Empty
  - assertNotEmpty
    
    Check Value Not Empty
  - assertCount
    
    Check Array Length
  - assertContains
    
    Check Value in Array
  - assertNotContains
    
    Check Value Not in Array
  - assertStringContainsString
    
    Check Substring in String
  - assertStringNotContainsString
    
    Check Substring Absent
  - assertMatchesRegularExpression
    
    Check Regex Pattern
  - assertFileExists
    
    Check File Exists
  - assertFileEquals
    
    Check Files Identical
  - assertJson
    
    Check Valid JSON String
  - assertJsonStringEqualsJsonString
    
    Compare JSON Content
- Annotations
  - @dataProvider
    
    Test with Data Sets
  - @depends
    
    Dependent Test Method
  - @group
    
    Group Tests Together
  - @covers
    
    Specify Tested Class
  - @coversMethod
    
    Specify Tested Method
  - @large
    
    Slow Running Test Flag
- Fixtures
  - setUp
    
    Run Before Each Test
  - tearDown
    
    Run After Each Test
  - setUpBeforeClass
    
    Run Once Before Class
  - tearDownAfterClass
    
    Run Once After Class
- Exceptions
  - expectException
    
    Expect Exception Type
  - expectExceptionMessage
    
    Expect Exception Message
  - expectExceptionCode
    
    Expect Exception Code
- Test Doubles
  - createMock
    
    Create Mock Object
  - getMockBuilder
    
    Advanced Mock Creation
- Mock Methods
  - expects
    
    Set Method Expectation
  - willReturn
    
    Specify Return Value
  - willReturnCallback
    
    Return from Callback
  - willThrowException
    
    Throw Exception
  - with
    
    Parameter Constraints
- Mock Counts
  - once
    
    Expect One Call
  - never
    
    Expect No Calls
  - exactly
    
    Exact Number of Calls
  - any
    
    Any Number of Calls
- phpunit.xml
  - Configuration File
    
    Project Configuration
  - directory Suite
    
    Test Directory Path
  - file Suite
    
    Specific Test File
  - exclude
    
    Exclude Directory
- Command Line
  - #NAME?
    
    Run Specific Test
    
    Run Grouped Tests
    
    Exclude Test Groups
    
    Readable Output Format
    
    Enable Color Output
    
    Stop on First Failure
- Code Coverage
  - Xdebug Required
    
    Enable Code Coverage
  - #NAME?
    
    HTML Report Generation
    
    Clover XML Report
    
    Console Coverage Report
- Best Practices
  - One Assertion Per Test
    
    Keep Tests Focused
  - Test Names Clear
    
    Describe Test Purpose
  - Independent Tests
    
    Tests Should Not Depend
PHP Laravel
- Laravel Introduction
  - What is Laravel
    
    Popular PHP Framework
- Laravel Features
  - Eloquent ORM
    
    Active Record Implementation
  - Blade Templating
    
    Template Engine
  - Artisan CLI
    
    Command Line Tool
  - Routing System
    
    Clean Route Definitions
  - Migrations
    
    Database Version Control
- Installation
  - Composer Create
    
    composer create-project laravel
  - Laravel Installer
    
    laravel new project
  - Requirements
    
    PHP 8.1 or Higher
- Artisan Commands
  - php artisan make:model
    
    Create Model Class
  - php artisan make:controller
    
    Create Controller
  - php artisan make:migration
    
    Create Migration
  - php artisan migrate
    
    Run Migrations
  - php artisan tinker
    
    Interactive Shell
  - php artisan route:list
    
    List All Routes
  - php artisan cache:clear
    
    Clear Application Cache
- Routing
  - web.php File
    
    Web Routes Definition
  - api.php File
    
    API Routes Definition
  - Route Methods
    
    get post put delete
  - Route Parameters
    
    Route Parameter Binding
  - Named Routes
    
    Route Name Method
  - Route Groups
    
    Group Middleware Prefix
- Controllers
  - Make Controller
    
    php artisan make:controller
  - Resource Controller
    
    CRUD Methods Automatically
  - Invokable Controller
    
    Single Action Controller
- Views
  - Blade Files
    
    blade.php Extension
  - Blade Echo
    
    Double Brace Syntax
  - Blade Directives
    
    @if @foreach @section
  - Blade Components
    
    Reusable UI Components
- Eloquent
  - Model Creation
    
    php artisan make:model
  - Model Properties
    
    fillable guarded table
  - CRUD Operations
    
    create update delete find
  - Relationships
    
    hasMany belongsTo belongsToMany
- Migrations
  - Schema Builder
    
    Create and Modify Tables
  - Up Method
    
    Apply Migration Changes
  - Down Method
    
    Revert Migration Changes
- Validation
  - Request Validation
    
    validate Method
  - Form Request
    
    Custom Request Classes
  - Rules List
    
    required email unique
- Authentication
  - php artisan make:auth
    
    Generate Auth Scaffolding
  - Auth Facade
    
    Authentication Methods
  - Authentication Guards
    
    web api Guards
PHP Symfony
- Symfony Introduction
  - What is Symfony
    
    Modular PHP Framework
- Symfony Features
  - Reusable Components
    
    Standalone Libraries
- Symfony Installation
  - Composer Create
    
    composer create-project symfony
- Symfony Console
  - bin/console
    
    Command Line Tool
- Symfony Components
  - HttpFoundation
    
    Request Response Handling
  - Routing
    
    Advanced Routing System
  - Validator
    
    Validation Component
  - DependencyInjection
    
    Service Container
- Doctrine ORM
  - Doctrine Introduction
    
    Object Relational Mapping
  - Entities
    
    Database Mapped Classes
  - Repositories
    
    Database Query Methods
- Twig Templating
  - Twig Introduction
    
    Template Engine
- Twig Syntax
  - Double Brace Echo
    
    Curly Brace Syntax
- Routing Attributes
  - Routing Configuration
    
    PHP 8 Attributes
PHP CodeIgniter
- CodeIgniter Introduction
  - What is CodeIgniter
    
    Lightweight PHP Framework
- CodeIgniter Features
  - Small Footprint
    
    Minimal Configuration
- CodeIgniter Installation
  - Download and Extract
    
    Simple Setup
- MVC Pattern
  - Models
    
    Database Logic Layer
  - Views
    
    Presentation Layer
  - Controllers
    
    Request Handler Layer
- Configuration
  - Config Files
    
    Database Autoload Config
- Database Query Builder
  - Query Builder Class
    
    Fluent Interface for Queries
PHP WordPress
- WordPress Introduction
  - What is WordPress
    
    PHP CMS Platform
- WordPress Hooks
  - Actions
    
    do_action add_action
  - Filters
    
    apply_filters add_filter
- Plugin Development
  - Plugin Header
    
    Plugin Metadata Comment
  - Activation Hook
    
    register_activation_hook
  - Deactivation Hook
    
    register_deactivation_hook
- Theme Development
  - functions.php
    
    Theme Functions File
  - Template Files
    
    index php single php page php
  - Template Hierarchy
    
    WordPress File Naming
- Custom Post Types
  - register_post_type
    
    Create Custom Content Types
- WP_Query
  - Custom Queries
    
    Advanced Database Queries
PHP Caching
- OPcache
  - Introduction
    
    Opcode Caching
  - Enable Setting
    
    opcache.enable Directive
  - Memory Setting
    
    opcache.memory_consumption
  - Validation Setting
    
    opcache.validate_timestamps
  - Reset Function
    
    opcache_reset Function
- APCu
  - Introduction
    
    User Data Caching
  - Installation
    
    pecl install apcu
  - Store Data
    
    apcu_store Function
  - Fetch Data
    
    apcu_fetch Function
  - Delete Data
    
    apcu_delete Function
  - Check Exists
    
    apcu_exists Function
  - Clear Cache
    
    apcu_clear_cache Function
- Memcached
  - Introduction
    
    Distributed Memory Caching
  - Installation
    
    apt-get install memcached
  - PHP Extension
    
    pecl install memcached
  - Connect Server
    
    new Memcached addServer
  - Set Data
    
    memcached set Method
  - Get Data
    
    memcached get Method
  - Delete Data
    
    memcached delete Method
  - Increment Value
    
    memcached increment Method
  - Decrement Value
    
    memcached decrement Method
- Redis
  - Introduction
    
    Advanced Key Value Store
  - Installation
    
    apt-get install redis-server
  - PHP Extension
    
    pecl install redis
  - Connect Server
    
    new Redis connect
  - Set Value
    
    redis set Method
  - Get Value
    
    redis get Method
  - Set Expiry
    
    redis expire Method
  - Delete Key
    
    redis del Method
  - Increment Value
    
    redis incr Method
  - Hash Operations
    
    redis hSet hGet hDel
  - Pub Sub
    
    redis publish subscribe
- Page Caching
  - Output Buffering
    
    ob_start Function
  - Check Cache
    
    Verify Cache File Exists
  - Save Cache
    
    file_put_contents Cache
  - Serve Cache
    
    Read and Output Cache File
  - Cache Invalidation
    
    Delete on Content Update
- Query Caching
  - Cache Results
    
    Cache Database Query Results
- Cache Strategies
  - Cache Hit Ratio
    
    Monitor Effectiveness
  - Cache Stampede
    
    Prevent Multiple Writes
PHP Command Line
- CLI Basics
  - What is PHP CLI
    
    Command Line Interface
- CLI vs Web
  - No HTTP Headers
    
    Different php.ini File
- Running Scripts
  - Execute PHP File
    
    php script.php
- Interactive Shell
  - php -a
    
    Interactive PHP Shell
- Run Code Direct
  - php -r
    
    Execute One Liner
- Built-in Server
  - php -S
    
    Start Development Server
- Built-in Server Router
  - php -S router.php
    
    Router File for Server
- Command Arguments
  - $argv Array
    
    Arguments Passed to Script
- Argument Count
  - $argc Variable
    
    Number of Arguments
- Script Name
  - $argv 0
    
    Script File Name
- First Argument
  - $argv 1
    
    First User Argument
- STDIN Stream
  - php stdin
    
    Standard Input Stream
- STDOUT Stream
  - php stdout
    
    Standard Output Stream
- STDERR Stream
  - php stderr
    
    Standard Error Stream
- Read STDIN
  - fopen stdin
    
    Open Standard Input
- Read Line
  - fgets STDIN
    
    Read Single Line
- Write STDOUT
  - fwrite STDOUT
    
    Write to Output
- Write Error
  - fwrite STDERR
    
    Write to Error
- getopt Function
  - Parse Options
    
    Parse Command Line Options
- getopt Example
  - getopt a b
    
    Short Option Parsing
- getopt Long
  - getopt option
    
    Long Option Parsing
- Exit Codes
  - exit 0
    
    Success Exit Code
  - exit 1
    
    Failure Exit Code
- Environment Variables
  - getenv Function
    
    Get Environment Variable
  - putenv Function
    
    Set Environment Variable
- CLI Detection
  - PHP SAPI
    
    Check if CLI Mode
- Terminal Colors
  - ANSI Codes
    
    Color Output Codes
- Text Color
  - 033 32m
    
    Green Text Code
- Background Color
  - 033 41m
    
    Red Background Code
- Reset Color
  - 033 0m
    
    Reset to Default
- Progress Bar
  - CLI Progress
    
    Text Progress Indicator
- Table Output
  - Format Table
    
    Display Data as Table
- Spinner Animation
  - CLI Spinner
    
    Loading Animation
- Symfony Console
  - Console Component
    
    CLI Framework
- Symfony Command
  - Extend Command
    
    Create CLI Command
- Symfony Input
  - Input Interface
    
    Arguments and Options
- Symfony Output
  - Output Interface
    
    Styled Output
PHP Cron Jobs
- Cron Introduction
  - Cron Jobs
    
    Scheduled Tasks on Linux
PHP Design Patterns
- Singleton Pattern
  - Definition
    
    Single Instance Class
  - Private Constructor
    
    Prevent Direct Instantiation
  - Private Clone
    
    Prevent Cloning
  - getInstance Method
    
    Return Single Instance
  - Database Example
    
    Singleton DB Connection
- Factory Pattern
  - Definition
    
    Create Objects Without Specification
  - Simple Factory
    
    Static Method Creation
  - Factory Method
    
    Subclass Decides Type
  - Abstract Factory
    
    Family of Related Objects
  - Payment Example
    
    PayPal Stripe Factory
- Strategy Pattern
  - Definition
    
    Family of Algorithms
  - Strategy Interface
    
    Common Algorithm Interface
  - Context Class
    
    Maintains Strategy Reference
  - Payment Strategy
    
    Multiple Payment Methods
  - Dynamic Change
    
    Switch at Runtime
- Observer Pattern
  - Definition
    
    Subject Observer Relationship
  - SplSubject Interface
    
    Subject Interface
  - SplObserver Interface
    
    Observer Interface
  - attach Method
    
    Add Observer
  - detach Method
    
    Remove Observer
  - notify Method
    
    Notify All Observers
  - Event System
    
    Event Listeners Example
- Decorator Pattern
  - Definition
    
    Add Behavior Without Modifying
  - Component Interface
    
    Original Interface
  - Concrete Component
    
    Base Implementation
  - Decorator Class
    
    Wraps Component
  - Caching Example
    
    Add Cache to Repository
  - Logging Example
    
    Add Logging to Service
- Adapter Pattern
  - Definition
    
    Convert Interface to Another
  - Target Interface
    
    Expected Interface
  - Adaptee Class
    
    Existing Class
  - Adapter Class
    
    Bridges Target Adaptee
  - Payment Example
    
    Stripe to PayPal Adapter
- Repository Pattern
  - Definition
    
    Separate Data Logic
  - Repository Interface
    
    Data Access Contract
  - Concrete Repository
    
    Database Implementation
  - User Repository
    
    CRUD for User Entity
  - Repository Cache
    
    Decorator for Caching
- Dependency Injection
  - Definition
    
    Pass Dependencies via Constructor
  - Constructor Injection
    
    Most Common Method
  - Setter Injection
    
    Optional Dependencies
  - Interface Injection
    
    Contract Based
  - Service Container
    
    Autowiring Dependencies
  - Benefits
    
    Testability Flexibility
- MVC Pattern
  - Definition
    
    Model View Controller
  - Model
    
    Business Logic Layer
  - View
    
    Presentation Template Layer
  - Controller
    
    Request Handler Layer
  - Routing
    
    Map URLs to Controllers
  - Dispatcher
    
    Load Controller Execute
- Front Controller Pattern
  - Definition
    
    Single Entry Point
  - index.php
    
    Front Controller File
  - Routing Logic
    
    Determine Controller from URL
  - Bootstrap
    
    Initialize Application
PHP Projects
- Login System
  - User Registration
    
    Create New User Account
  - Password Hashing
    
    Store Secure Passwords
  - Login Validation
    
    Verify User Credentials
  - Session Creation
    
    Start User Session
  - Remember Me Feature
    
    Long Term Cookie Login
  - Password Reset
    
    Send Reset Email Link
  - Email Verification
    
    Verify User Email Address
  - Two Factor Authentication
    
    Extra Security Layer
  - Account Lockout
    
    Bad Attempts Limit
  - Logout Function
    
    Destroy User Session
- CRUD Application
  - Create Record
    
    Insert New Database Entry
  - Read Records
    
    Display Database Entries
  - Update Record
    
    Modify Existing Entry
  - Delete Record
    
    Remove Database Entry
  - Search Functionality
    
    Filter Records by Keyword
  - Pagination Feature
    
    Split Records Across Pages
  - Sort Records
    
    Order by Column
  - Export to CSV
    
    Download Records as CSV
  - Import from CSV
    
    Bulk Upload Records
  - AJAX CRUD
    
    Submit Without Page Reload
- REST API
  - User Endpoint
    
    List Create Users
    
    Register Login Profile
  - User Show Endpoint
    
    Get Single User
  - User Update Endpoint
    
    Modify User Data
  - User Delete Endpoint
    
    Remove User Record
  - API Authentication
    
    API Key Validation
  - JWT Implementation
    
    Generate and Verify Tokens
  - Rate Limiting
    
    Limit API Requests
  - API Versioning
    
    Support Multiple Versions
  - Error Handling
    
    Return Proper Status Codes
  - Response Formatting
    
    Consistent JSON Structure
  - JWT Authentication
    
    Generate and Verify Tokens
  - Product Endpoint
    
    CRUD for Products
  - Order Endpoint
    
    Create View Orders
  - API Documentation
    
    Swagger Integration
- File Manager
  - Upload Files
    
    Handle File Uploads
  - List Files
    
    Display Directory Contents
  - Preview Images
    
    Show Image Thumbnails
  - Download Files
    
    Force File Download
  - Delete Files
    
    Remove from Server
  - Rename Files
    
    Change File Names
  - Create Folders
    
    Make New Directories
  - Move Files
    
    Change File Location
  - Search Files
    
    Find by File Name
  - File Information
    
    Show Size Type Date
- Shopping Cart
  - Add to Cart
    
    Store Product in Cart
  - View Cart
    
    Display Cart Items
  - Update Quantity
    
    Change Item Count
  - Remove Item
    
    Delete from Cart
  - Coupon System
    
    Apply Discount Codes
  - Calculate Total
    
    Sum All Items
  - Checkout Process
    
    Collect User Details
  - Order Confirmation
    
    Save Order to Database
  - Email Receipt
    
    Send Order Summary
  - Payment Integration
    
    Stripe PayPal Gateway
- Blog System
  - Create Post
    
    Write New Blog Entry
    
    Add New Blog Post
  - Edit Post
    
    Modify Existing Content
    
    Modify Existing Post
  - Delete Post
    
    Remove Blog Entry
    
    Remove Post Permanently
  - Display Posts
    
    Show All Blog Entries
    
    Show All Posts List
  - Single Post View
    
    Show Full Article
    
    Show Full Post Content
  - Categories
    
    Group Related Posts
  - Tags
    
    Add Post Labels
  - Comments System
    
    User Feedback on Posts
  - Post Search
    
    Find by Title Content
  - Post Pagination
    
    Split Posts Across Pages
  - SEO Friendly URLs
    
    Clean URL Structure
  - Database Schema
    
    Posts Categories Comments Tables
  - Category Management
    
    Group Posts by Category
  - Tag System
    
    Label Posts with Tags
  - Comment System
    
    User Comments on Posts
  - Search Functionality
    
    Find Posts by Keyword
  - Pagination Feature
    
    Split Posts Across Pages
- Task Manager
  - Create Task
    
    Add New Task Item
  - Edit Task
    
    Modify Task Details
  - Delete Task
    
    Remove Task Permanently
  - Mark Complete
    
    Set Task Status Done
  - Due Dates
    
    Set Task Deadlines
  - Priority Levels
    
    High Medium Low
  - Filter Tasks
    
    Show by Status
  - Sort Tasks
    
    Order by Date Priority
  - Search Tasks
    
    Find by Title Description
  - Task Dashboard
    
    Summary Statistics
- Contact Form
  - Build Form
    
    Create HTML Contact Form
  - Validate Input
    
    Check Required Fields
  - Sanitize Data
    
    Remove Dangerous Characters
  - CSRF Protection
    
    Add Security Token
  - CAPTCHA Integration
    
    Prevent Bot Spam
  - Send Email
    
    Use PHPMailer
  - Auto Reply
    
    Send Confirmation Email
  - Save to Database
    
    Store Contact Messages
  - Admin Notification
    
    Alert New Message
  - Spam Filtering
    
    Block Suspicious Content
- Dashboard
  - Statistics Cards
    
    Show Key Metrics
  - Charts Integration
    
    Visual Data Display
  - Recent Activity
    
    Show Latest Actions
  - User Management
    
    List All Users
  - Role Management
    
    Assign User Permissions
  - Settings Page
    
    Update Application Config
  - Report Generation
    
    Create PDF Reports
  - Export Data
    
    Download as Excel CSV
  - Activity Logs
    
    Track User Actions
  - Notification System
    
    Alert Important Events
- WebSocket Chat
  - Server Setup
    
    Ratchet WebSocket Server
  - Client Connection
    
    JavaScript WebSocket API
  - Send Message
    
    Broadcast to All Users
  - Private Messages
    
    Direct User Chat
  - User Typing
    
    Show Typing Indicator
  - Online Status
    
    Show Active Users
  - Message History
    
    Store in Database
  - File Sharing
    
    Send Images Files
  - Emoji Support
    
    Add Reaction Icons
  - Notification Sounds
    
    Alert New Messages
- PDF Generator
  - HTML to PDF
    
    Use dompdf Library
  - Invoice Creation
    
    Generate Order Invoice
  - Report PDF
    
    Create Data Reports
  - Certificate Maker
    
    Generate Achievement PDF
  - Table Layout
    
    Display Data Tables
  - Header Footer
    
    Add Page Numbers
  - Watermark Add
    
    Protect PDF Document
  - Password Protection
    
    Secure PDF Files
  - Email PDF
    
    Send as Email Attachment
  - Batch Generation
    
    Create Multiple PDFs
- Excel Export
  - Export to XLSX
    
    Use PhpSpreadsheet
  - Multiple Sheets
    
    Create Workbook Tabs
  - Format Cells
    
    Set Colors Borders Fonts
  - Add Formulas
    
    Calculate in Excel
  - Export from Database
    
    Fetch and Write Data
  - Export with Headers
    
    Column Names First Row
  - CSV Export
    
    Simple Comma Separated
- Excel Import
  - Read Excel File
    
    Load and Parse Data
  - Validate Data
    
    Check Required Fields
  - Import to Database
    
    Bulk Insert Records
  - Error Reporting
    
    Show Failed Rows
- Image Gallery
  - Upload Images
    
    Store Image Files
  - Create Thumbnails
    
    Resize with GD
  - Display Gallery
    
    Show Image Grid
  - Lightbox View
    
    Popup Image Viewer
  - Image Categories
    
    Group by Album
  - Add Watermark
    
    Protect Image Copyright
  - Image Delete
    
    Remove from Server
  - Bulk Upload
    
    Multiple Files at Once
  - Search Images
    
    Find by Name Tag
  - Image Comments
    
    User Feedback on Images
- Newsletter System
  - Subscribe Form
    
    Collect Email Addresses
  - Double Opt-In
    
    Send Confirmation Email
  - Unsubscribe Link
    
    Remove from List
  - Manage Subscribers
    
    Admin Panel Control
  - Create Campaign
    
    Write Newsletter Content
  - Send Newsletter
    
    Bulk Email Sending
  - Queue System
    
    Process Large Batches
  - Open Tracking
    
    Know Who Read Email
  - Click Tracking
    
    Monitor Link Clicks
  - Analytics Dashboard
    
    Show Campaign Stats
- URL Shortener
  - Create Short URL
    
    Generate Unique Code
  - Redirect Logic
    
    Forward to Original URL
  - Custom Alias
    
    User Defined Short Codes
  - QR Code Generator
    
    Create QR for Short URL
  - Click Counter
    
    Track Visit Statistics
  - Analytics Page
    
    Show Referrer Device
  - API Support
    
    Programmatic URL Creation
  - Link Expiry
    
    Set Expiration Date
  - Password Protection
    
    Secure Shared Links
  - Bulk Shorten
    
    Multiple URLs at Once
- Poll System
  - Create Poll
    
    Question and Options
  - Display Poll
    
    Show Voting Interface
  - Submit Vote
    
    Save User Selection
  - Prevent Double Voting
    
    Restrict Duplicate Votes
  - Show Results
    
    Display Vote Counts
  - Results Chart
    
    Visual Data Representation
  - Multiple Polls
    
    Manage Different Topics
  - Poll Status
    
    Open Close Voting
  - Comments Section
    
    Discuss Poll Topic
  - Export Results
    
    Download Vote Data
- Quiz System
  - Create Quiz
    
    Questions and Answers
  - Display Question
    
    Show One by One
  - Submit Answer
    
    Save User Response
  - Calculate Score
    
    Count Correct Answers
  - Show Result
    
    Display Final Score
  - Leaderboard
    
    Top Scorers List
  - Time Limit
    
    Restrict Quiz Duration
  - Random Questions
    
    Shuffle Question Order
  - Multiple Attempts
    
    Allow Retake Quiz
  - Certificate Generation
    
    Award on Passing
- Expense Tracker
  - Add Expense
    
    Record New Transaction
  - Edit Expense
    
    Modify Existing Entry
  - Delete Expense
    
    Remove Transaction
  - Categories
    
    Group Expenses by Type
  - Dashboard
    
    Show Total Spending
  - Monthly Report
    
    View by Month
  - Yearly Report
    
    Annual Summary
  - Budget Setting
    
    Define Spending Limits
  - Chart Display
    
    Visual Expense Breakdown
  - Export Report
    
    Download PDF Excel
- Ecommerce Cart
  - Product Management
    
    Add Edit Delete Products
  - Add to Cart Function
    
    Store Product in Session
  - View Cart Page
    
    Display Cart Items
  - Update Quantity
    
    Change Item Count
  - Remove Item
    
    Delete from Cart
  - Coupon System
    
    Apply Discount Codes
  - Calculate Total
    
    Sum All Item Prices
  - Checkout Process
    
    Collect Customer Details
  - Order Confirmation
    
    Save Order to Database
  - Email Receipt
    
    Send Order Summary Email
  - Payment Integration
    
    Stripe PayPal Gateway
- Real-time Chat
  - Ratchet Server Setup
    
    WebSocket Server
  - Client Connection
    
    JavaScript WebSocket
  - Send Message
    
    Broadcast to All Users
  - Private Message
    
    Direct User Chat
  - User Typing
    
    Show Typing Indicator
  - Online Status
    
    Show Active Users
  - Message History
    
    Store in Database
  - File Sharing
    
    Send Images Files
  - Emoji Support
    
    Add Reaction Icons
  - Notification Sound
    
    Alert New Messages
- CRUD Generator
  - Database Connection
    
    PDO Configuration
  - Table Listing
    
    Show All Database Tables
  - Generate Create Form
    
    HTML Form Generator
  - Generate Read List
    
    Data Table Generator
  - Generate Update Form
    
    Edit Form Generator
  - Generate Delete Feature
    
    Safe Delete Code
  - Code Output Display
    
    Show Generated Code
  - Download Feature
    
    Save Generated Files
PHP Advanced Topics
- Web Scraping
  - cURL Requests
    
    Fetch External Pages
  - DOM Parsing
    
    Extract HTML Elements
  - XPath Queries
    
    Navigate XML HTML
  - Regular Expressions
    
    Extract Patterns
  - Crawl Multiple Pages
    
    Follow Pagination
  - Delay Requests
    
    Avoid Rate Limiting
  - User Agent Spoofing
    
    Identify as Browser
  - Handle JavaScript
    
    Use Headless Browser
  - Parse JSON APIs
    
    Extract JSON Data
  - Save Scraped Data
    
    Store in Database
- Queue Systems
  - Beanstalkd Setup
    
    Install Queue Server
  - Put Job in Queue
    
    Add Task to Queue
  - Process Queue
    
    Worker Script Execution
  - Retry Failed Jobs
    
    Handle Processing Errors
  - Delayed Jobs
    
    Schedule Future Processing
  - Priority Levels
    
    Process Important First
  - Queue Monitoring
    
    Track Job Status
  - RabbitMQ PHP
    
    AMQP Protocol Implementation
  - Redis Queue
    
    Use Redis for Queues
  - Database Queue
    
    Simple Table Based Queue
- Event Broadcasting
  - Event Class
    
    Define Event Object
  - Listener Class
    
    Handle Event Occurrence
  - Event Dispatcher
    
    Trigger Events
  - Async Events
    
    Queue for Performance
  - WebSocket Push
    
    Real Time Updates
  - Laravel Events
    
    Easy Event System
  - Logging Events
    
    Track System Activity
  - User Notifications
    
    Send on Events
  - Email on Event
    
    Trigger Email Alerts
- Middleware
  - What is Middleware
    
    Filter HTTP Requests
  - Before Middleware
    
    Process Before Controller
  - After Middleware
    
    Process After Controller
  - Authentication Middleware
    
    Check User Login
  - Admin Middleware
    
    Verify Admin Role
  - Rate Limit Middleware
    
    Throttle Requests
  - CORS Middleware
    
    Add Headers to Response
  - Logging Middleware
    
    Record All Requests
  - Custom Middleware
    
    Build Your Own
- Service Container
  - What is Container
    
    Dependency Management
  - Bind Interface
    
    Register Implementation
  - Resolve Class
    
    Auto Create Instance
  - Singleton Binding
    
    Single Instance Per Request
  - Contextual Binding
    
    Different Implementations
  - Service Providers
    
    Group Related Bindings
  - Deferred Provider
    
    Lazy Loading Service
  - Tagged Services
    
    Group Multiple Services
  - PSR-11 Container
    
    Standard Container Interface
  - Container Aware
    
    Services Knowing Container
- Database Migrations
  - Create Migration
    
    Define Schema Changes
  - Up Method
    
    Apply Database Changes
  - Down Method
    
    Revert Database Changes
  - Rollback Command
    
    Undo Last Migration
  - Migrate Refresh
    
    Rollback and Remigrate
  - Seed Database
    
    Insert Default Data
  - Faker Library
    
    Generate Fake Data
  - Data Types
    
    String Integer Timestamp
  - Table Indexes
    
    Improve Query Speed
  - Foreign Keys
    
    Define Relationships
- Database Seeding
  - Create Seeders
    
    Generate Test Data
  - Factory Pattern
    
    Bulk Data Generation
  - Relationships Seeding
    
    Create Related Data
  - Environment Specific
    
    Dev vs Production
  - Truncate First
    
    Clear Existing Data
  - Seed from CSV
    
    Import External Data
  - Seed with Images
    
    Generate Test Files
  - Database Refresh
    
    Run All Seeders
- API Documentation
  - OpenAPI Specification
    
    Standard API Docs
  - Swagger UI
    
    Interactive Documentation
  - Generate from Code
    
    Annotations to Docs
  - Postman Collection
    
    Export API Definition
  - Redoc Tool
    
    Clean Documentation Viewer
  - Versioning in Docs
    
    Multiple API Versions
  - Authentication Docs
    
    Show Auth Methods
  - Request Examples
    
    Show Sample Requests
  - Response Examples
    
    Show Expected Output
  - Error Documentation
    
    List Error Codes
- Code Profiling
  - Xdebug Profiler
    
    Analyze Performance
  - Blackfire io
    
    Performance Monitoring
  - Tideways Service
    
    Production Profiling
  - Memory Profiling
    
    Check Memory Usage
  - Time Profiling
    
    Find Slow Functions
  - Query Profiling
    
    Analyze Database Queries
  - Call Graph
    
    Visual Function Calls
  - Profile in Production
    
    Use Sampling
  - Compare Profiles
    
    Before After Changes
  - Continuous Profiling
    
    Always on Profiling
- Code Linting
  - PHP Linter
    
    Check Syntax Errors
  - PSR Standards
    
    Follow Coding Standards
  - Code Sniffer
    
    Detect Style Violations
  - Static Analysis
    
    Find Bugs Without Running
  - Psalm Tool
    
    Advanced Static Analysis
  - PhpStan Tool
    
    Catch Type Errors
  - IDE Integration
    
    Linting in Editor
  - Git Hooks
    
    Lint Before Commit
  - CI Integration
    
    Automated Code Checks
  - Fix Automatically
    
    Use PHPCBF
- GraphQL API
  - GraphQL Introduction
    
    Query Language for APIs
  - GraphQL Schema
    
    Define Types Queries Mutations
  - GraphQL Query
    
    Fetch Specific Data Fields
  - GraphQL Mutation
    
    Modify Server Data
  - GraphQL PHP Library
    
    webonyx graphql-php
  - Resolvers Functions
    
    Fetch Data for Fields
  - GraphQL vs REST
    
    Single Endpoint Advantage
  - GraphQL Client
    
    Apollo or URQL
  - GraphQL Playground
    
    Interactive Documentation Tool
  - Nested Queries
    
    Fetch Related Data
- Microservices Architecture
  - What is Microservices
    
    Small Independent Services
  - API Gateway
    
    Single Entry Point
  - Service Discovery
    
    Find Service Locations
  - Inter Service Communication
    
    HTTP or Message Queue
  - PHP Microservice
    
    Use Slim or Lumen
  - Docker Containers
    
    Isolate Each Service
  - Service Registry
    
    Store Service Addresses
  - Circuit Breaker
    
    Handle Service Failures
  - Distributed Tracing
    
    Monitor Request Flow
  - Centralized Logging
    
    Aggregate All Logs
- Message Brokers
  - RabbitMQ Introduction
    
    Message Queue System
  - RabbitMQ PHP Library
    
    php-amqplib Package
  - Producer Code
    
    Send Messages to Queue
  - Consumer Code
    
    Process Queue Messages
  - Exchange Types
    
    Direct Fanout Topic
  - Queue Binding
    
    Connect Exchange to Queue
  - Message Acknowledgment
    
    Confirm Processing
  - Dead Letter Queue
    
    Handle Failed Messages
  - Kafka Introduction
    
    High Throughput Streaming
  - Apache Kafka
    
    Publish Subscribe System
  - RDKafka PHP
    
    Apache Kafka Client
- Webhooks
  - What is Webhook
    
    HTTP Callback on Events
  - Create Webhook Endpoint
    
    Receive POST Requests
  - Verify Webhook Signature
    
    Authenticate Sender
  - Handle Retries
    
    Process Failed Deliveries
  - Idempotency Handling
    
    Prevent Duplicate Processing
  - Event Types List
    
    Payment User Order Events
  - Stripe Webhooks
    
    Payment Events Integration
  - GitHub Webhooks
    
    Code Push Events
  - Webhook Debugging
    
    Use Request Bin
  - Webhook Security
    
    Validate Incoming Requests
- Serverless PHP
  - Bref Introduction
    
    Run PHP on AWS Lambda
  - AWS Lambda
    
    Function as Service
  - Serverless Framework
    
    Deploy PHP Functions
  - API Gateway
    
    HTTP Triggers for Lambda
  - Environment Variables
    
    Configuration in Cloud
  - Cold Start
    
    First Request Delay
  - Database Connection
    
    Use RDS or DynamoDB
  - File Storage
    
    S3 Bucket Integration
  - Cost Optimization
    
    Pay per Execution
  - Local Development
    
    Use Bref Local
- Payment Gateway Integration
  - Stripe Setup
    
    Create Account Get Keys
  - Stripe Checkout
    
    Prebuilt Payment Page
  - Payment Intent API
    
    Create Payment Intent
  - Stripe Webhook
    
    Handle Events
  - Refund Process
    
    Cancel Payment
  - PayPal Setup
    
    REST API Credentials
  - PayPal Orders
    
    Create and Capture
  - Razorpay Setup
    
    Indian Payment Gateway
  - Subscription Billing
    
    Recurring Payments
  - Save Payment Method
    
    Future Charges
- SMS Integration
  - Twilio Setup
    
    Get Account SID Token
  - Send SMS Message
    
    Use Twilio API
  - Verify Phone Number
    
    Send OTP Code
  - Two Factor Authentication
    
    SMS Based Login
  - TextLocal API
    
    Indian SMS Provider
  - Africas Talking
    
    African SMS Gateway
  - Message Queues
    
    Async SMS Sending
  - Bulk SMS Sending
    
    Campaign Management
  - SMS Delivery Status
    
    Webhook for Reports
  - Opt Out Handling
    
    User Unsubscribe Management
- File Format Processing
  - PDF Extraction
    
    Read Text from PDF
  - PDF Creation
    
    Generate Fillable Forms
  - Word Document Processing
    
    Read DOCX Files
  - Excel Advanced Formulas
    
    Read Calculated Values
  - CSV Large Files
    
    Stream Processing
  - ZIP Archive Creation
    
    Compress Multiple Files
  - ZIP Extraction
    
    Unzip Uploaded Files
  - Image EXIF Data
    
    Read Camera Info
  - Barcode Generation
    
    Create QR Codes
  - Markdown Parsing
    
    Convert to HTML
- Data Encryption
  - OpenSSL Extension
    
    Encryption Functions
  - openssl_encrypt
    
    Encrypt Data String
  - openssl_decrypt
    
    Decrypt Encrypted Data
  - AES 256
    
    Strong Encryption Algorithm
  - Encryption Key
    
    Store in Environment
  - IV Initialization Vector
    
    Random Bytes Required
  - Sodium Extension
    
    Modern Cryptography Library
  - sodium_crypto_secretbox
    
    Authenticated Encryption
  - Password Based Encryption
    
    Derive Key from Password
  - Encrypt Database Fields
    
    Sensitive Data Protection
- Data Compression
  - gzcompress
    
    Compress String Data
  - gzuncompress
    
    Decompress String Data
  - gzencode
    
    Create Gzip Content
  - gzdecode
    
    Decode Gzip Data
  - ZipArchive Class
    
    Create ZIP Files
  - Compress Large Files
    
    Stream Compression
  - Compress API Response
    
    Reduce Bandwidth
  - Compress Database Backup
    
    Save Storage Space
  - Compression Level
    
    Balance Speed Size
  - Zstandard Extension
    
    Facebook Compression Algorithm
- Data Serialization
  - serialize Format
    
    PHP Native Serialization
  - unserialize Security
    
    Don't Trust User Input
  - JSON Serialization
    
    Cross Language Compatible
  - MessagePack
    
    Binary Serialization Format
  - Protocol Buffers
    
    Google Serialization
  - YAML Format
    
    Human Readable Serialization
  - Custom Serialization
    
    Implement __serialize
  - Object Graph
    
    Handle Circular References
  - Serialize Closure
    
    Use Opis Closure Library
  - Performance Comparison
    
    Pick Fastest Format
- Multilingual Support
  - Locale Setting
    
    setlocale Function
  - Gettext Implementation
    
    _() Function
  - PO File Creation
    
    Portable Object Format
  - MO File Compilation
    
    Gettext Machine Object
  - Language Detection
    
    Browser Accept Language
  - URL Based Language
    
    domain com en page
  - Session Based Language
    
    User Preference Storage
  - Database Translation
    
    Store in Tables
  - Array Translation
    
    Simple Key Value Arrays
  - Fallback Language
    
    Default When Missing
- Accessibility
  - WAI ARIA Attributes
    
    Screen Reader Support
  - Alt Text for Images
    
    Describe Image Content
  - Form Labels
    
    Associate with Inputs
  - Keyboard Navigation
    
    Tab Index Management
  - Color Contrast
    
    Readable Text Colors
  - Font Size Scaling
    
    Relative Units Usage
  - ARIA Landmarks
    
    Main Navigation Regions
  - Form Error Announcement
    
    Screen Reader Alerts
  - Focus Management
    
    Highlight Active Element
  - Accessible Tables
    
    Header Scope Attributes
- GDPR Compliance
  - Data Consent Form
    
    User Permission Collection
  - Right to Access
    
    Show User Data
  - Right to Deletion
    
    Delete User Information
  - Data Portability
    
    Export User Data
  - Cookie Consent
    
    Before Storing Cookies
  - Privacy Policy Page
    
    Explain Data Usage
  - Data Breach Notification
    
    Alert Users on Breach
  - Age Verification
    
    Check User Age
  - Anonymize Data
    
    Remove Personal Identifiers
  - Data Retention Policy
    
    Delete Old Data
PHP Best Practices
- Error Handling
  - Always Use Exceptions
    
    Don't Use Error Suppression
  - Log All Errors
    
    Use Monolog Library
  - Custom Error Pages
    
    Don't Show PHP Errors
  - Try Catch Appropriately
    
    Catch Specific Exceptions
  - Finally Block Cleanup
    
    Release Resources
  - Global Exception Handler
    
    Handle Uncaught Exceptions
  - Error Reporting Level
    
    E_ALL in Development
  - Display Errors Off
    
    Disable in Production
- Database
  - Always Use Prepared Statements
    
    Prevent SQL Injection
  - Use PDO or MySQLi
    
    Not Deprecated mysql
  - Close Connections
    
    Free Database Resources
  - Index Your Tables
    
    Optimize Query Performance
  - Limit Result Sets
    
    Use Limit Clause
  - Use Transactions
    
    Maintain Data Integrity
  - Don't Query in Loops
    
    Use Joins Instead
  - Escape Like Wildcards
    
    Handle Search Properly
  - Use Read Replicas
    
    Separate Read Write
- Security
  - Validate All Inputs
    
    Never Trust User Data
  - Sanitize All Outputs
    
    Use htmlspecialchars
  - Use CSRF Tokens
    
    Protect State Changing Requests
  - Implement Rate Limiting
    
    Prevent Brute Force
  - Hash All Passwords
    
    Use password_hash
  - Use HTTPS Everywhere
    
    Encrypt Data Transfer
  - Regenerate Session ID
    
    Prevent Fixation
  - Set Secure Cookies
    
    HttpOnly Secure SameSite
  - Use Content Security Policy
    
    Prevent XSS
  - File Upload Validation
    
    Check Type and Size
- Code Organization
  - Use PSR Standards
    
    Follow PHP Standards
  - Use Namespaces
    
    Prevent Name Collisions
  - Single Responsibility Principle
    
    One Job Per Class
  - Don't Repeat Yourself
    
    Extract Common Code
  - Use Dependency Injection
    
    Don't Use Singletons
  - Comment Your Code
    
    Explain Why Not What
  - Use Type Hints
    
    Catch Type Errors Early
  - Return Types
    
    Declare Return Types
  - Use Strict Types
    
    declare strict_types 1
  - Keep Functions Small
    
    Maximum 20 Lines
- Performance
  - Use OPcache
    
    Enable Opcode Caching
  - Use Single Quotes
    
    Faster Than Double
  - Unset Large Variables
    
    Free Memory Early
  - Cache Expensive Operations
    
    Use Redis Memcached
  - Limit Function Calls
    
    Avoid Inside Loops
  - Use isset Not array_key_exists
    
    Faster Array Check
  - Use foreach Not while
    
    Faster Iteration
  - Limit Object Creation
    
    Reuse Objects When Possible
  - Use Generators
    
    Save Memory for Large Data
  - Profile Your Code
    
    Find Real Bottlenecks
- Error Reporting
  - Production Settings
    
    display_errors Off
  - Development Settings
    
    display_errors On
  - Logging Setup
    
    log_errors On
- File Structure
  - Separate Concerns
    
    MVC Pattern
  - Configuration Files
    
    Outside Webroot
- Version Control
  - gitignore Rules
    
    vendor .env Uploads
  - Branch Strategy
    
    Main Develop Feature
- Documentation
  - PHPDoc Comments
    
    Function Class Documentation
  - README File
    
    Project Overview Setup
- Dependency Management
  - Update Regularly
    
    Composer Update Check
  - Lock File Commit
    
    composer.lock in Git
- Testing
  - Write Unit Tests
    
    PHPUnit Coverage
  - Test Edge Cases
    
    Empty Null Invalid Inputs
PHP Deployment
- Deployment Steps
  - Git Pull
    
    Get Latest Code
  - Composer Install
    
    Install Dependencies
  - Migrate Database
    
    Run Schema Updates
  - Clear Cache
    
    Remove Old Cache Files
  - Restart Queue
    
    Reload Worker Processes
  - Restart Webserver
    
    Apache or Nginx Reload
- Deployment Tools
  - Deployer PHP
    
    PHP Deployment Tool
  - Capistrano
    
    Ruby Tool for PHP
  - Envoy
    
    Laravel Deployment Tool
  - Rocketeer
    
    Standalone Deployer
  - Forge Server
    
    Laravel Forge Deployment
  - Envoyer
    
    Zero Downtime Deployment
- CI CD
  - GitHub Actions
    
    Automated Testing Deployment
  - GitLab CI
    
    Built-in CI/CD Pipeline
  - Jenkins Server
    
    Java Based CI Tool
  - Buddy CI
    
    PHP Focused CI/CD
  - Circle CI
    
    Cloud Based CI Service
  - Travis CI
    
    Popular PHP CI Service
  - Code Coverage
    
    Report Test Coverage
  - Automated Testing
    
    Run Tests on Push
  - Deploy on Pass
    
    Deploy Only if Tests Pass
- Environment Variables
  - Use env Files
    
    Store Config in .env
  - Production Values
    
    Override on Server
  - Secret Management
    
    Don't Commit Secrets
  - Vault Service
    
    HashiCorp Vault
  - CI CD Variables
    
    Set in Pipeline
  - Server Environment
    
    Apache SetEnv
  - Nginx Environment
    
    env Directive
  - php-fpm Environment
    
    Set in Pool Config
PHP Advanced Projects
- Real Estate Listing
  - Property Management System
    
    Add Property Listings
  - Property Search Form
    
    Filter by Location Price
  - Property Details Page
    
    Show Full Information
  - Image Gallery Slider
    
    Multiple Property Photos
  - Agent Contact Form
    
    Inquiry About Property
  - Favorite Properties
    
    Save User Selections
  - Compare Properties
    
    Side by Side View
  - Maps Integration
    
    Show Property Location
  - Mortgage Calculator
    
    Estimate Monthly Payment
  - Property Status Mark
    
    Available Sold Rented
- Job Portal
  - Job Posting Form
    
    Employer Create Jobs
  - Job Listings Page
    
    Search and Filter Jobs
  - Job Details View
    
    Full Job Description
  - Apply for Job
    
    Submit Resume and Details
  - Resume Upload
    
    Store Candidate Documents
  - Employer Dashboard
    
    Manage Job Postings
  - Candidate Dashboard
    
    Track Applications Status
  - Job Alerts Email
    
    Send Matching Jobs
  - Company Profiles
    
    Employer Information Page
  - Application Tracking System
    
    Review Candidates
- E-Learning Platform
  - Course Creation
    
    Instructor Add Course
  - Course Catalog
    
    Browse Available Courses
  - Video Lessons
    
    Stream Course Content
  - Quiz System
    
    Test Student Knowledge
  - Student Progress
    
    Track Course Completion
  - Certificate Generation
    
    PDF After Completion
  - Rating System
    
    Rate Course Quality
  - Discussion Forum
    
    Ask Questions
  - Payment Gateway
    
    Sell Paid Courses
  - Wishlist Feature
    
    Save Courses for Later
- Social Media Platform
  - User Profiles
    
    Edit Personal Information
  - Post Status
    
    Share Text and Images
  - News Feed
    
    Show Friend Activities
  - Like System
    
    React to Posts
  - Comment System
    
    Discuss on Posts
  - Friend Request
    
    Send Connect Request
  - Messaging System
    
    Private Chat Between Users
  - Notification System
    
    Alert User Activities
  - Hashtag Support
    
    Group Related Posts
  - Privacy Settings
    
    Control Post Visibility
- Hotel Booking System
  - Room Management
    
    Add Edit Room Types
  - Room Availability
    
    Check Date Range
  - Booking Form
    
    Collect Guest Details
  - Payment Integration
    
    Secure Online Payment
  - Booking Confirmation
    
    Email Receipt to Guest
  - Manage Bookings
    
    Admin Calendar View
  - Cancel Booking
    
    Process Refunds
  - Customer Reviews
    
    Rate Stay Experience
  - Special Offers
    
    Discount Codes Promotion
  - Room Features List
    
    Amenities and Services
- Doctor Appointment System
  - Doctor Profiles
    
    Specialization and Timings
  - Patient Registration
    
    Create User Account
  - Search Doctors
    
    Fillter by Speciality
  - Book Appointment
    
    Select Date Time
  - Available Slots
    
    Show Free Timings
  - Appointment Reminder
    
    SMS Email Notification
  - Patient Dashboard
    
    View Appointments History
  - Doctor Dashboard
    
    Manage Schedule
  - Prescription Upload
    
    Share Medical Reports
  - Feedback System
    
    Rate Doctor Service
- Inventory Management System
  - Product Management
    
    Add Update Delete Products
  - Stock Tracking
    
    Incoming Outgoing Quantity
  - Low Stock Alert
    
    Notification for Reorder
  - Supplier Management
    
    Vendor Information
  - Purchase Orders
    
    Create Product Requests
  - Barcode Generation
    
    Scan Product Labels
  - Category Management
    
    Group Similar Products
  - Report Generation
    
    Sales Stock Summary
  - Export Inventory
    
    Download Excel CSV
  - Multi Warehouse
    
    Manage Different Locations
- School Management System
  - Student Registration
    
    Add Student Information
  - Teacher Profiles
    
    Manage Staff Details
  - Class Management
    
    Create Grade Levels
  - Subject Allocation
    
    Assign Subjects to Classes
  - Exam Management
    
    Create Question Papers
  - Marks Entry
    
    Record Student Grades
  - Report Card Generate
    
    PDF Result Sheets
  - Attendance Tracking
    
    Daily Student Presence
  - Fees Collection
    
    Payment Management
  - Parent Portal
    
    View Child Progress
- Support Ticket System
  - Create Ticket
    
    Submit Support Request
  - Ticket Categories
    
    Department Classification
  - Priority Levels
    
    High Medium Low
  - Assign Agent
    
    Distribute Tickets
  - Add Reply
    
    Respond to Customer
  - Ticket Status
    
    Open In Progress Closed
  - Attach Files
    
    Upload Screenshots
  - Knowledge Base
    
    FAQ Articles
  - Email Notification
    
    Alert on Updates
  - Satisfaction Rating
    
    Survey After Resolution
- Multi Vendor Ecommerce
  - Vendor Registration
    
    Seller Account Signup
  - Vendor Dashboard
    
    Manage Own Products
  - Product Approval
    
    Admin Review Before Publish
  - Vendor Commission
    
    Percentage on Each Sale
  - Order Management
    
    Process Customer Orders
  - Vendor Payout
    
    Withdraw Earnings
  - Vendor Review
    
    Rating for Sellers
  - Coupon System
    
    Vendor Specific Discounts
  - Shipping Management
    
    Vendor Set Rates
  - Analytics Dashboard
    
    Vendor Sales Reports
PHP Debugging
- Debugging Techniques
  - var_dump Usage
    
    Print Variable Details
  - print_r Usage
    
    Human Readable Array Output
  - error_log Function
    
    Write to Log File
  - trigger_error Function
    
    Generate User Errors
  - assert Function
    
    Debug Only Checks
  - Xdebug Step Debugging
    
    Line by Line Execution
  - Xdebug Breakpoints
    
    Pause Code Execution
  - Xdebug Stack Trace
    
    See Function Call Path
  - Whoops Error Handler
    
    Beautiful Error Pages
  - Clockwork Extension
    
    Browser DevTools for PHP
- Logging Libraries
  - Monolog Introduction
    
    Popular Logging Library
  - Monolog Logger
    
    Create Logger Instance
  - Log Levels
    
    Debug Info Warning Error
  - Monolog Handlers
    
    File Stream Email Slack
  - Log Rotation
    
    Archive Old Log Files
  - Structured Logging
    
    JSON Format Logs
  - Context Information
    
    Add Extra Data Array
  - Monolog Processors
    
    Add Session IP UserAgent
  - Monolog Formatters
    
    Custom Log Format
  - PSR-3 Logger
    
    Standard Logger Interface
- Profiling Tools
  - Xdebug Profiler
    
    Analyze Performance Bottlenecks
  - Webgrind Tool
    
    Xdebug CacheGrind Viewer
  - PHPBench
    
    Performance Benchmarking
  - Blackfire Comparison
    
    Find Slow Functions
  - Tideways UI
    
    Visual Profiling Interface
  - Slow Log Analysis
    
    Find Database Issues
  - Memory Profiling
    
    Check Memory Leaks
  - Function Timing
    
    Measure Execution Time
  - Request Profiling
    
    Analyze Full Request
  - Production Profiling
    
    Use Sampling Method
PHP Optimization
- Code Optimization
  - Use Single Quotes
    
    Better Performance
  - Use isset Function
    
    Faster Array Key Check
  - Use foreach Loop
    
    Faster than while
  - Full Strict Comparison
    
    Faster Type Check
  - Avoid Function in Loop
    
    Calculate Outside
  - Use Static Methods
    
    Slightly Faster
  - Unset Large Variables
    
    Free Memory Early
  - Use Increment Operator
    
    $i++ Faster than $i+=1
  - Use Built-in Functions
    
    Often Faster than Custom
  - Use strpos Over Regex
    
    Simple String Search
- Database Optimization
  - Use Database Indexes
    
    Speed Up Queries
  - Select Only Needed
    
    Don't Use Select Star
  - Limit Result Sets
    
    Use Limit Clause
  - Avoid Select in Loops
    
    Use Joins Instead
  - Use Query Cache
    
    Cache Frequent Queries
  - Optimize Joins
    
    Index Join Columns
  - Use EXPLAIN Command
    
    Analyze Query Plan
  - Batch Insertions
    
    Multiple Rows at Once
  - Use Connection Pooling
    
    Reduce Handshake Time
  - Read Replicas
    
    Separate Read Write
- Caching Strategies
  - Full Page Cache
    
    Save HTML Output
  - Fragment Caching
    
    Cache Page Parts
  - Opcode Caching
    
    OPcache Enabled
  - Object Caching
    
    APCu Redis Memcached
  - Cache Invalidation
    
    Clear on Data Update
  - Cache Warming
    
    Preload Popular Data
  - Cache Stampede Prevention
    
    Lock Keys
  - CDN Usage
    
    Cache Static Assets
  - Browser Caching
    
    Set Cache Headers
  - HTTP Caching
    
    ETag Last Modified
- Opcode Optimization
  - OPcache Settings
    
    memory_consumption Value
  - OPcache Interned Strings
    
    Saves Memory
  - OPcache Max Files
    
    accelerated_files Limit
  - OPcache Validate Timestamps
    
    Development Only
  - OPcache Revalidate Freq
    
    Check Frequency
  - Preload Scripts
    
    Load Classes at Startup
  - Preload File
    
    opcache.preload Directive
  - JIT Compilation
    
    PHP 8 Just In Time
  - JIT Buffer Size
    
    opcache.jit_buffer_size
  - JIT Tracing Mode
    
    Optimize Loops
  - OPcache Dashboard
    
    Monitor Hit Rate
PHP 8.4
- Property Hooks
  - Get Hook
    
    Get Brace Syntax
  - Set Hook
    
    Set Brace Syntax
  - Virtual Property
    
    No Backing Value
  - Backed Property
    
    Has Default Value
  - Readonly Hook
    
    Only Get Allowed
  - Writeonce Hook
    
    Set Once Then Readonly
  - Get Hook Syntax
    
    Get Brace Syntax
  - Set Hook Syntax
    
    Set Brace Syntax
  - Example Usage
    
    User Class Property
- Asymmetric Visibility
  - Public Get Private Set
    
    Read Public Write Private
  - Protected Get Private Set
    
    R estricted Access
    
    Restricted Access
  - Public Get Protected Set
    
    Internal Write Only
  - Syntax Example
    
    public private set name
  - Example Usage
    
    Product Price Field
- Array Functions
  - array_find Function
    
    Find First Match
  - array_find_key Function
    
    Find Key by Match
  - array_any Function
    
    Check Any Match
  - array_all Function
    
    Check All Match
- HTML5 DOM
  - HTML5 Parsing
    
    Modern HTML Tags
  - DOMDocument HTML5
    
    Improved Parsing
  - HTML5 Serialization
    
    Saving HTML5 Content
- mbstring Functions
  - mb_trim Function
    
    Trim Multibyte Strings
  - mb_ltrim Function
    
    Left Trim Multibyte
  - mb_rtrim Function
    
    Right Trim Multibyte
  - mb_ucfirst Function
    
    Uppercase First Multibyte
  - mb_lcfirst Function
    
    Lowercase First Multibyte
- New Array Functions
  - array_find Function
    
    Find First Match
  - array_find_key Function
    
    Find Key by Match
  - array_any Function
    
    Check Any Match
  - array_all Function
    
    Check All Match
  - Practical Example
    
    Find User by Age
- HTML5 DOM Support
  - HTML5 Parsing
    
    Modern HTML Tags
  - DOMDocument HTML5
    
    Improved Parsing
  - HTML5 Serialization
    
    Saving HTML5 Content
  - Practical Example
    
    Parse Modern HTML
- New mbstring Functions
  - mb_trim Function
    
    Trim Multibyte Strings
  - mb_ltrim Function
    
    Left Trim Multibyte
  - mb_rtrim Function
    
    Right Trim Multibyte
  - mb_ucfirst Function
    
    Uppercase First Multibyte
  - mb_lcfirst Function
    
    Lowercase First Multibyte
  - Example Usage
    
    Clean User Input
PHP 8.5
- RFCs Overview
  - Property Types
    
    Type Hints for Properties
  - Class Expressions
    
    Dynamic Class Creation
  - Pattern Matching
    
    Advanced Switch Statement
  - Asynchronous Functions
    
    Built-in Async Support
  - Module System
    
    Built-in Modules Support
- Upcoming RFCs
  - Property Types
    
    Type Hints for Properties
  - Class Expressions
    
    Dynamic Class Creation
  - Pattern Matching
    
    Advanced Switch Statement
  - Asynchronous Functions
    
    Built-in Async Support
  - Module System
    
    Built-in Modules Support
  - Enum Improvements
    
    Backed Enum Methods
WordPress
- Plugin Header
  - Plugin Name
    
    Plugin Display Name
  - Plugin URI
    
    Plugin Homepage Link
  - Description Field
    
    Plugin Purpose Text
  - Version Field
    
    Plugin Version Number
  - Author Field
    
    Creator Name
  - License Field
    
    GPL MIT Apache
- Actions System
  - do_action Function
    
    Trigger Action Hook
  - add_action Function
    
    Register Action Hook
  - remove_action Function
    
    Unregister Action Hook
  - has_action Function
    
    Check Action Exists
  - did_action Function
    
    Check Action Fired
  - current_action Function
    
    Get Current Action
  - Action Priority
    
    Execution Order Number
  - Action Arguments
    
    Pass Multiple Parameters
- Filters System
  - apply_filters Function
    
    Apply Filter Hook
  - add_filter Function
    
    Register Filter Hook
  - remove_filter Function
    
    Unregister Filter Hook
  - has_filter Function
    
    Check Filter Exists
  - current_filter Function
    
    Get Current Filter
  - Filter Priority
    
    Execution Sequence
  - Filter Arguments
    
    Modify Data Values
- Shortcodes
  - add_shortcode Function
    
    Create Shortcode Handler
  - remove_shortcode Function
    
    Delete Shortcode
  - shortcode_atts Function
    
    Parse Default Attributes
  - do_shortcode Function
    
    Execute Shortcodes
  - Nested Shortcodes
    
    Shortcodes Inside Shortcodes
  - Example Shortcode
    
    Gallery Button Form
- Custom Post Types
  - register_post_type Function
    
    Create Custom Content
  - Labels Parameter
    
    Admin Display Names
  - Public Parameter
    
    Visible on Frontend
  - Show UI Parameter
    
    Admin Menu Display
  - Supports Parameter
    
    Title Editor Thumbnail
  - Menu Position
    
    Navigation Order Number
  - Menu Icon
    
    Dashicon Identifier
  - Has Archive
    
    Enable Archive Page
  - Rewrite Slug
    
    Permalink Structure
- Post Meta
  - add_post_meta Function
    
    Add Custom Field
  - get_post_meta Function
    
    Retrieve Custom Field
  - update_post_meta Function
    
    Modify Custom Field
  - delete_post_meta Function
    
    Remove Custom Field
  - Meta Boxes
    
    Custom Input Fields
  - Save Meta Box
    
    Store User Input
  - Validation Rules
    
    Check Input Values
  - Sanitization Process
    
    Clean User Data
- WP_Query Class
  - Query Arguments
    
    Category Tag Date Author
  - WP_Query Object
    
    Custom Database Query
  - The Loop
    
    Display Query Results
  - have_posts Method
    
    Check Posts Exist
  - the_post Method
    
    Setup Post Data
  - get_posts Method
    
    Return Posts Array
  - wp_reset_query Function
    
    Reset Global Query
  - Meta Query
    
    Filter by Custom Fields
  - Taxonomy Query
    
    Filter by Categories Tags
- Theme Development
  - Template Hierarchy
    
    File Loading Order
  - index.php
    
    Fallback Template File
  - front-page.php
    
    Homepage Template
  - single.php
    
    Post Single View
  - page.php
    
    Page Template File
  - archive.php
    
    Archive Listing Page
  - category.php
    
    Category Template
  - tag.php
    
    Tag Template File
  - author.php
    
    Author Archive Page
  - date.php
    
    Date Archive Page
  - search.php
    
    Search Results Page
  - 404.php
    
    Not Found Page
  - functions.php
    
    Theme Configuration File
  - style.css
    
    Theme Stylesheet File
  - screenshot.png
    
    Theme Thumbnail Image
  - Theme Header Comment
    
    Theme Metadata Block
- Theme Functions
  - get_header Function
    
    Load Header Template
  - get_footer Function
    
    Load Footer Template
  - get_sidebar Function
    
    Load Sidebar Template
  - wp_head Hook
    
    Header Injected Code
  - wp_footer Hook
    
    Footer Injected Code
  - body_class Function
    
    Add Body CSS Classes
- Theme Tags
  - the_post_thumbnail Function
    
    Display Post Thumbnail
  - the_title Function
    
    Display Post Title
  - the_content Function
    
    Display Post Content
  - the_excerpt Function
    
    Display Post Excerpt
  - the_permalink Function
    
    Display Post URL
  - the_author Function
    
    Display Post Author
  - the_date Function
    
    Display Post Date
  - comments_template Function
    
    Load Comments Template
  - paginate_links Function
    
    Display Pagination Links
- Block Editor
  - Register Block
    
    Register Block Type
  - Block Attributes
    
    Block Settings Data
  - Block Render
    
    Output HTML Function
  - Block Category
    
    Editor Grouping
  - Dynamic Blocks
    
    Server Rendered Content
  - Block Styles
    
    Custom Block Styling
Laravel
- Eloquent Relationships
  - One To One
    
    HasOne HasMany Relation
  - One To Many
    
    Parent Child Relation
  - Many To Many
    
    Pivot Table Relation
  - Has Many Through
    
    Indirect Relation
  - Polymorphic Relations
    
    Multiple Model Types
- Eloquent Eager Loading
  - N Plus 1 Problem
    
    Solved with With Method
  - Constraints on Load
    
    Filter Related Data
  - Lazy Eager Loading
    
    Load After Query
- Eloquent Scopes
  - Local Scope
    
    Reusable Query Constraints
  - Global Scope
    
    Apply to All Queries
  - Anonymous Scope
    
    Closure Based Scope
- Eloquent Events
  - Retrieved Event
    
    After Fetching Model
PHPStan
- Introduction
  - Static Analysis Tool
    
    Find Bugs Without Running
- Installation
  - Composer Command
    
    require phpstan/phpstan
- Level System
  - Level 0
    
    Basic Type Checking
  - Level 1
    
    Dead Code Detection
  - Level 2
    
    Generic Type Checks
  - Level 3
    
    Array Type Checks
  - Level 4
    
    Callable Type Checks
  - Level 5
    
    Method Signature Checks
  - Level 6
    
    Report Missing Types
  - Level 7
    
    Strict Type Checking
  - Level 8
    
    Maximum Strictness
  - Level 9
    
    Complete Type Coverage
- Configuration
  - phpstan.neon File
    
    Configuration Settings
  - Ignore Errors
    
    Exclude Specific Lines
  - Baseline File
    
    Existing Errors Ignore
Psalm
- Introduction
  - Advanced Static Analysis
    
    Find Complex Bugs
- Installation
  - Composer Command
    
    require vimeo/psalm
- Initialization
  - psalm --init
    
    Create Configuration File
- Level System
  - Levels 1 to 8
    
    Increasing Strictness
- Annotations
  - @psalm-return
    
    Specify Return Type
  - @psalm-param
    
    Specify Parameter Type
  - @psalm-var
    
    Specify Variable Type
- Taint Analysis
  - Prevent Security Issues
    
    Find XSS SQL Injection
- Plugins
  - Extended Functionality
    
    Community Packages
Phan
- Introduction
  - Static Analyzer
    
    Microsoft Tool
- Installation
  - Composer Command
    
    require phan/phan
- Configuration
  - .phan/config.php
    
    Configuration Array
PHP-CS-Fixer
- Introduction
  - Coding Standards Fixer
    
    Automatic Code Style Fix
- Installation
  - Composer Command
    
    require friendsofphp/php-cs-fixer
- Rules
  - PSR-12 Standard
    
    Symfony Rules Set
- Dry Run
  - See Changes Only
    
    No File Modification
- Apply Command
  - Fix Code Automatically
    
    Apply All Rules
PHP_CodeSniffer
- Introduction
  - Detect Coding Violations
    
    Find Style Issues
- Installation
  - Composer Command
    
    require squizlabs/php_codesniffer
- Standards
  - PSR1 PSR12
    
    PEAR Zend Standards
- Report Command
  - Show Violation Details
    
    Console Output
- PHPCBF Tool
  - Auto Fix Violations
    
    Fix Simple Issues
Rector
- Introduction
  - Automated Code Refactoring
    
    Upgrade PHP Version
- Installation
  - Composer Command
    
    require rector/rector
- Rules Sets
  - Upgrade PHP Rules
    
    Level Set Lists
- Process Command
  - Apply Refactoring
    
    Modify Code Files
- Dry Run Option
  - Preview Changes Only
    
    No File Modification
PHPMD
- Introduction
  - Mess Detector Tool
    
    Find Code Issues
- Installation
  - Composer Command
    
    require phpmd/phpmd
- Rules Sets
  - Clean Code Rules
    
    Code Size Naming Unused
- Report Formats
  - HTML XML Text
    
    Output Format Selection
PHP GraphQL
- Library Setup
  - webonyx graphql-php
    
    GraphQL PHP Library
- Schema Definition
  - ObjectType Class
    
    Root Schema Configuration
- Query Type
  - Root Query Object
    
    Entry Point Definition
- Mutation Type
  - Data Modification Root
    
    Change Operations
- Resolver Functions
  - Field Value Providers
    
    Fetch Data Logic
- Type System
  - Scalar Types
    
    String Int Float Boolean
- Custom Scalar Types
  - DateTime JSON Type
    
    Custom Validation
- Validation Rules
  - Query Syntax Checking
    
    GraphQL Validators
- Error Handling
  - User Friendly Messages
    
    Exception Formatting
- Context Object
  - Shared Data Across Resolvers
    
    Authentication Data
- GraphQLite Framework
  - Annotation Based GraphQL
    
    Simplified Syntax
- Lighthouse PHP
  - GraphQL for Laravel
    
    Easy Integration
ReactPHP
- Introduction
  - Event Driven PHP
    
    Non Blocking I/O
- Installation
  - Composer Command
    
    require reactphp/react
- Event Loop
  - Main Execution Manager
    
    Handle Async Tasks
- Timer Function
  - Schedule Delayed Execution
    
    setTimeout Equivalent
- Stream Component
  - Asynchronous Data Flow
    
    Read Write Streams
- HTTP Server
  - Non Blocking Web Server
    
    Handle Concurrent Requests
- Database Driver
  - Async MySQL Queries
    
    Non Blocking Queries
- DNS Component
  - Async DNS Resolution
    
    Non Blocking Lookups
- Promise Interface
  - Deferred Result Handling
    
    Future Value Container
Amp Framework
- Introduction
  - Concurrency Framework
    
    Async PHP Library
- Installation
  - Composer Command
    
    require amphp/amp
- Promise System
  - Future Result Container
    
    Then Catch Methods
- Parallel Processing
  - Multi Processing Support
    
    CPU Bound Tasks
- HTTP Client
  - Async HTTP Requests
    
    Concurrent API Calls
- WebSocket Support
  - Real Time Communication
    
    Bidirectional Messaging
Swoole
- Introduction
  - High Performance Server
    
    Async PHP Extension
- Installation
  - PECL Command
    
    pecl install swoole
- HTTP Server
  - Async PHP Server
    
    High Concurrency Support
- Coroutines
  - Lightweight Threads
    
    Async Code Writing
- WebSocket Server
  - Real Time Features
    
    Push Notifications
OpenSwoole
- Introduction
  - Fork of Swoole
    
    Community Maintained
Async Comparison
- ReactPHP vs Amp
  - Use Cases Comparison
    
    Choose Best Fit
PHP gRPC
- Introduction
  - RPC Framework
    
    Google Remote Procedure Call
- Protocol Buffers
  - Interface Definition Language
    
    Binary Serialization
- proto3 Syntax
  - Latest Protocol Version
    
    Modern Features
- Protoc Compiler
  - Generate PHP Code
    
    Compile Proto Files
- Service Definition
  - RPC Methods Names
    
    Request Response Types
- Unary RPC
  - Single Request Response
    
    Simple RPC Call
- Server Streaming
  - Multiple Response Messages
    
    Stream from Server
- Client Streaming
  - Multiple Request Messages
    
    Stream from Client
- Bidirectional Streaming
  - Both Sides Stream
    
    Full Duplex Communication
- grpc Library
  - PHP gRPC Extension
    
    Core Implementation
- Server Implementation
  - Extend Generated Class
    
    Implement Methods
- Client Implementation
  - Call Remote Methods
    
    RPC Invocation
- Authentication Methods
  - TLS SSL Token
    
    Secure Communication
- Deadlines Setting
  - Request Timeout
    
    Cancel Slow Requests
- Error Handling
  - Status Codes
    
    Standard Error Propagation
- Metadata Exchange
  - Custom Headers
    
    Send Additional Data
- Use Cases
  - Microservices Communication
    
    Internal APIs
PHP Event Sourcing
- Event Store
  - Event Database
    
    Store State Changes
- Event Sourcing Pattern
  - Store State as Events
    
    Rebuild State Later
- Aggregate Root
  - Entity with Rules
    
    Business Logic Container
- Event Recording
  - Save Events First
    
    Then Apply Changes
- Event Replay
  - Rebuild State
    
    Play Events in Order
- Sourcing Repository
  - Load from Stream
    
    Event Loading Logic
- Event Versioning
  - Handle Schema Changes
    
    Upgrade Events
- Projection Building
  - Build Read Models
    
    Query Optimized Views
- Eventual Consistency
  - Read Models Lag
    
    Write Read Separation
- Prooph Library
  - Event Store Implementation
    
    PHP Package
- Broadway Library
  - Event Sourcing PHP
    
    CQRS Support
- Snapshots
  - Performance Optimization
    
    Save Current State
PHP CQRS
- Pattern Introduction
  - Command Query Separation
    
    Read Write Split
- Command Side
  - Write Operations
    
    State Changing Actions
- Query Side
  - Read Operations
    
    Data Fetching Only
- Command Object
  - Data Transfer Object
    
    Write Request Data
- Query Object
  - Data Transfer Object
    
    Read Request Data
- Command Handler
  - Process Command Logic
    
    Execute Write Operations
- Query Handler
  - Process Query Logic
    
    Execute Read Operations
- Command Bus
  - Route Commands
    
    Find Correct Handler
- Query Bus
  - Route Queries
    
    Find Query Handler
- Separate Models
  - Write vs Read Models
    
    Different Optimizations
- SimpleBus Library
  - Command Query Bus
    
    PHP Implementation
- Ecotone Framework
  - CQRS Support
    
    Complete Implementation
PHP DDD
- Domain Driven Design
  - Strategic Design
    
    Business Focused
- Entity Definition
  - Object with Identity
    
    Unique Identifier
- Value Object
  - Immutable Object
    
    No Identity
- Aggregate Definition
  - Consistency Boundary
    
    Group of Objects
- Aggregate Root
  - Entry Point
    
    Access Through Root
- Repository Pattern
  - Data Access
    
    Abstraction Layer
- Domain Service
  - Stateless Logic
    
    Business Operations
- Domain Event
  - Important Occurrence
    
    State Change Notification
- Bounded Context
  - Model Boundary
    
    Separate Domain Areas
- Ubiquitous Language
  - Common Vocabulary
    
    Team Communication
- Application Service
  - Orchestrate Use Cases
    
    Coordinate Domain
- Infrastructure Layer
  - Technical Implementation
    
    Database File System
- Hexagonal Architecture
  - Ports and Adapters
    
    Clean Architecture
- Value Object Examples
  - Email Address
    
    Money Amount
- Entity Examples
  - User Account
    
    Product Item
- Repository Example
  - Interface Contract
    
    Domain Layer Only
PHP Docker
- Introduction
  - What is Docker
    
    Container Platform Overview
- Installation
  - Docker Desktop
    
    Download and Install
  - Docker Engine
    
    Linux Installation Steps
- Basic Commands
  - docker pull
    
    Download PHP Image
  - docker run
    
    Start PHP Container
  - docker ps
    
    List Running Containers
  - docker stop
    
    Stop Running Container
  - docker rm
    
    Remove Stopped Container
  - docker images
    
    List Downloaded Images
- Dockerfile
  - FROM Directive
    
    Base Image Selection
  - RUN Directive
    
    Execute Commands
  - COPY Directive
    
    Copy Files to Container
  - WORKDIR Directive
    
    Set Working Directory
  - EXPOSE Directive
    
    Document Port Number
  - CMD Directive
    
    Default Command
  - ENTRYPOINT Directive
    
    Main Command
- PHP Dockerfile
  - Official PHP Image
    
    php apache or php fpm
  - Install Extensions
    
    docker-php-ext-install
  - Enable Extensions
    
    docker-php-ext-enable
  - PECL Install
    
    pecl install Command
  - Composer Install
    
    Install Composer in Container
  - User Permission
    
    www-data User Setup
- Docker Compose
  - Introduction
    
    Multi Container Setup
  - compose.yml
    
    Configuration File
  - Service Definition
    
    Container Configuration
  - Image Field
    
    Which Docker Image
  - Ports Field
    
    Map Container Ports
  - Volumes Field
    
    Mount Local Directories
  - Environment Field
    
    Set Environment Variables
  - Depends On Field
    
    Service Startup Order
  - docker-compose up
    
    Start All Services
  - docker-compose down
    
    Stop All Services
  - PHP MySQL Setup
    
    Web and Database Containers
  - PHP Nginx Setup
    
    Separate Web Server
  - Redis Container
    
    Caching Service Setup
- Multi Stage Build
  - Build Stage
    
    Compile Dependencies
  - Runtime Stage
    
    Smaller Final Image
  - Artifact Copy
    
    Copy from Build Stage
- Image Optimization
  - Alpine Linux
    
    Smaller Base Image
  - Layer Caching
    
    Order Dockerfile Commands
  - Cleanup Temp Files
    
    Remove apt-get Cache
  - .dockerignore
    
    Exclude Unnecessary Files
- Development Setup
  - Volume Mounting
    
    Code Sync Without Rebuild
  - Xdebug Setup
    
    Remote Debugging Configuration
  - Hot Reload
    
    File Change Detection
- Production Setup
  - Image Tagging
    
    Version Tags
  - Registry Push
    
    Docker Hub Upload
  - Deployment
    
    Container Orchestration
PHP Kubernetes
- Introduction
  - K8s Overview
    
    Container Orchestration Platform
- Basic Concepts
  - Pods
    
    Smallest Deployable Unit
  - Nodes
    
    Worker Machines
  - Cluster
    
    Node Collection
  - Deployment
    
    Pod Management Controller
  - Service
    
    Network Access Endpoint
  - ConfigMap
    
    Configuration Storage
  - Secrets
    
    Sensitive Data Storage
- PHP Deployment
  - Deployment YAML
    
    PHP Application Definition
  - Container Image
    
    Use Docker Image
  - Port Configuration
    
    Container Port Expose
  - Resource Limits
    
    CPU Memory Constraints
  - Health Checks
    
    Liveness Readiness Probes
- Service Exposure
  - ClusterIP
    
    Internal Only Access
  - NodePort
    
    External Access on Port
  - LoadBalancer
    
    Cloud Load Balancer
  - Ingress
    
    HTTP HTTPS Routing
- Config Management
  - Environment Variables
    
    Set in Deployment
  - ConfigMap Volume
    
    Mount as Files
  - Secret Volume
    
    Secure File Mount
- Scaling
  - Horizontal Scaling
    
    Increase Replica Count
  - Auto Scaling
    
    CPU Based Autoscaling
- Updates
  - Rolling Update
    
    Zero Downtime Deployment
  - Rollback
    
    Revert to Previous Version
PHP CI/CD
- Introduction
  - CI CD Meaning
    
    Continuous Integration Delivery
- GitHub Actions
  - YAML Workflow
    
    Configuration File
  - On Trigger
    
    Push Pull Request Events
  - Jobs Definition
    
    Parallel Execution Units
  - Steps Sequence
    
    Commands to Run
  - Setup PHP Action
    
    Configure PHP Version
  - Install Dependencies
    
    Composer Install
  - Run Tests
    
    PHPUnit Execution
  - Cache Dependencies
    
    Composer Cache Speed
  - Deploy Step
    
    Upload to Server
- GitLab CI
  - .gitlab-ci.yml
    
    Configuration File
  - Stages Definition
    
    Build Test Deploy
  - Job Script
    
    Commands to Execute
  - Artifacts
    
    Files Between Jobs
  - Cache Directive
    
    Speed Up Pipelines
- Jenkins
  - Introduction
    
    Java Based CI Tool
  - Pipeline as Code
    
    Jenkinsfile Definition
  - Blue Ocean
    
    Modern UI Interface
  - Plugins
    
    PHPUnit Composer Plugins
- Deployment Strategies
  - FTP Upload
    
    Simple File Transfer
  - RSYNC
    
    Sync File Changes
  - SSH Deploy
    
    Run Remote Commands
  - Docker Deploy
    
    Build and Push
  - Kubernetes Deploy
    
    Apply YAML Files
- Best Practices
  - Test Before Deploy
    
    Always Run Tests
  - Use Environment Variables
    
    Secrets Management
  - Parallel Jobs
    
    Faster Pipeline Execution
PHP Monitoring
- New Relic
  - Introduction
    
    APM Monitoring Tool
  - Installation
    
    PHP Agent Setup
  - Application Name
    
    Configure App Name
  - License Key
    
    Account Authentication
  - Transaction Traces
    
    Slow Request Details
  - Error Tracking
    
    Exception Monitoring
  - External Services
    
    Database API Calls
- Datadog
  - Introduction
    
    Monitoring Platform
  - Installation
    
    PHP Library Setup
  - Tracing Configuration
    
    Enable Distributed Tracing
  - Profiling
    
    Performance Analysis
  - Log Management
    
    Centralized Logging
- Prometheus
  - Introduction
    
    Open Source Monitoring
  - Metrics Export
    
    prometheus_client_php
  - Counter Metric
    
    Increasing Values
  - Gauge Metric
    
    Up Down Values
  - Histogram Metric
    
    Distribution Data
- Grafana
  - Dashboard
    
    Visualize Metrics
- Error Tracking
  - Sentry Setup
    
    Error Monitoring Tool
  - Sentry PHP SDK
    
    Installation Package
  - Capture Exception
    
    Sentry Capture Method
  - Release Tracking
    
    Deployment Version
  - Bugsnag Setup
    
    Alternative Error Tracker
PHP Interview
- Basics Questions
  - What is PHP
    
    PHP Definition Answer
  - PHP Full Form
    
    Hypertext Preprocessor
  - PHP vs JavaScript
    
    Server Side vs Client Side
- Variables Questions
  - Variable Scope Types
    
    Local Global Static
  - Superglobals List
    
    GET POST SESSION SERVER
- Data Types Questions
  - Type Juggling Example
    
    Automatic Type Conversion
- Operators Questions
  - == vs === Difference
    
    Value vs Type Comparison
  - Null Coalescing Operator
    
    Question Mark Question Mark
- Control Structure
  - switch vs match
    
    Difference Explanation
- Functions Questions
  - Pass by Reference
    
    Ampersand Parameter Usage
  - Anonymous Function Example
    
    Closure Use Case
- Arrays Questions
  - array_map vs foreach
    
    Functional vs Iterative
  - array_merge vs + Operator
    
    Difference Behavior
- Strings Questions
  - strpos vs preg_match
    
    When to Use Which
- OOP Questions
  - Abstract vs Interface
    
    When to Use Each
  - Traits Purpose
    
    Code Reuse Solution
  - Final Keyword Usage
    
    Prevent Inheritance Override
  - Magic Methods List
    
    Construct Destruct Get Set Call
- Database Questions
  - MySQLi vs PDO
    
    Which to Choose
  - Prepared Statement Benefit
    
    SQL Injection Prevention
- Security Questions
  - XSS Prevention Method
    
    htmlspecialchars Function
  - CSRF Protection Token
    
    Session Token Validation
  - Password Hashing Function
    
    password_hash Usage
  - SQL Injection Prevention
    
    Prepared Statements
- Session Questions
  - Session vs Cookie
    
    Server vs Client Storage
  - session_regenerate_id Purpose
    
    Prevent Session Fixation
- File Handling
  - move_uploaded_file Purpose
    
    Safe File Upload
- Error Handling
  - try catch finally
    
    Exception Handling Flow
- Performance
  - OPcache Purpose
    
    Opcode Caching
  - Static Method Advantage
    
    Faster Execution
- PHP 8 Features
  - Constructor Promotion Benefit
    
    Less Boilerplate Code
  - Match Expression Advantage
    
    No Fallthrough Returns Value
PHP Coding Challenges
- Challenge 1
  - Palindrome Check
    
    Reverse String Compare
- Challenge 2
  - FizzBuzz Problem
    
    Multiples of 3 5
- Challenge 3
  - Factorial Function
    
    Recursion vs Loop
- Challenge 4
  - Fibonacci Series
    
    Sequence Generation
- Challenge 5
  - Prime Number Check
    
    Divisibility Test
- Challenge 6
  - Reverse String
    
    Without Built-in Function
- Challenge 7
  - Array Sorting
    
    Manual Sort Implementation
- Challenge 8
  - Remove Duplicates
    
    From Array
- Challenge 9
  - Find Largest Number
    
    From Array
- Challenge 10
  - Anagram Check
    
    Two Strings Comparison
- Challenge 11
  - Count Vowels
    
    In String
- Challenge 12
  - Capitalize Words
    
    Uppercase First Letter
- Challenge 13
  - Binary Search
    
    Search in Sorted Array
- Challenge 14
  - Bubble Sort
    
    Sorting Algorithm
- Challenge 15
  - Two Sum Problem
    
    Find Pair Adding to Target
- Challenge 16
  - Array Rotation
    
    Shift Elements Position
- Challenge 17
  - Longest Word
    
    Find in String
- Challenge 18
  - URL Slugify
    
    Convert String to Slug
- Challenge 19
  - CSV Parser
    
    Parse Without Built-in
- Challenge 20
  - JSON Formatter
    
    Pretty Print JSON
PHP PSR Standards
- PSR-1
  - Basic Coding Standard
    
    Class Naming Rules
  - File Requirements
    
    Only PHP Tags UTF-8
  - Side Effects
    
    No Output or Logic Mixing
- PSR-12
  - Extended Coding Style
    
    Complete Style Guide
  - Indentation Rule
    
    4 Spaces No Tabs
  - Line Length
    
    Soft Limit 120 Characters
  - Visibility Keyword
    
    All Properties Methods Must Declare
  - Control Structure Spaces
    
    Spaces Before After
  - Namespace Declaration
    
    One Blank Line After
  - Use Declarations
    
    Grouped by Type
- PSR-4
  - Autoloading Standard
    
    Namespace to Path Mapping
  - Class Naming
    
    Case Sensitive Match
  - File Location
    
    Subdirectory Matching Namespace
- PSR-7
  - HTTP Message Interface
    
    Request Response Objects
  - Stream Interface
    
    Body Abstraction
  - URI Interface
    
    URL Manipulation
- PSR-11
  - Container Interface
    
    Dependency Injection
  - Container Methods
    
    get has Methods
- PSR-14
  - Event Dispatcher
    
    Event System Standard
- PSR-15
  - Request Handler
    
    Middleware Standard
- PSR-16
  - Simple Cache
    
    Key Value Storage
- PSR-18
  - HTTP Client
    
    HTTP Request Client
PHP Troubleshooting
- Common Errors
  - Parse Error
    
    Syntax Check Solution
  - Fatal Error
    
    Class Not Found Fix
  - Headers Already Sent
    
    Output Before Header
  - Maximum Execution Time
    
    set_time_limit Solution
  - Memory Limit Error
    
    memory_limit Increase
  - White Screen of Death
    
    Error Logging Enable
  - Connection Refused
    
    Database Service Check
  - Access Denied
    
    Permission File Fix
- Debugging Tips
  - Log to File
    
    error_log Function
  - Print Debug
    
    var_dump exit Method
  - Xdebug Step Debugging
    
    Line by Line Execution
PHP Resources
- Official Documentation
  - PHP Manual
    
    php.net Reference
- News Sources
  - PHP Watch
    
    Community News Site
- Podcasts
  - PHP Town Hall
    
    Weekly PHP Podcast
- Youtube Channels
  - Program With Gio
    
    PHP Tutorials
  - The Codeholic
    
    Advanced PHP Content
- Blogs
  - Stitcher io
    
    PHP Performance Blog
  - Brent Roose
    
    Modern PHP Articles
- Community
  - Laravel News
    
    Laravel Ecosystem
  - Reddit PHP
    
    PHP Subreddit
- Discord Servers
  - PHP Chat
    
    Community Help
- Slack Communities
  - PHP Town Hall
    
    Discussion Group
PHP Conclusion
- Learning Path
  - Beginner Level
    
    Syntax Basics Functions
  - Intermediate Level
    
    OOP Database Forms
  - Advanced Level
    
    Security Testing Patterns
  - Expert Level
    
    Architecture Performance
- Career Opportunities
  - PHP Developer Role
    
    Web Development Jobs
  - Laravel Developer
    
    Framework Specialization
  - WordPress Developer
    
    CMS Expert Role
  - Full Stack Developer
    
    PHP JavaScript Combined
- Market Demand
  - Enterprise Companies
    
    Still Using PHP
  - Startups Choice
    
    Rapid Development Need
  - Remote Jobs
    
    Work from Home Opportunities
- Salary Expectations
  - Entry Level
    
    Junior Developer Range
  - Mid Level
    
    2-5 Years Experience
  - Senior Level
    
    5+ Years Experience
- Future of PHP
  - PHP 8 Progress
    
    Performance Improvements
  - JIT Compilation
    
    Speed Enhancements
  - Static Analysis
    
    Type System Evolution
  - Community Growth
    
    Continued Framework Support
- Final Advice
  - Keep Learning
    
    Stay Updated with PHP
  - Build Projects
    
    Practice Portfolio Development
  - Join Community
    
    Network with Developers
  - Contribute Open Source
    
    Give Back to Community
- Final Summary
  - PHP Learning Path
    
    Complete Roadmap
  - Resources List
    
    Best Learning Materials
  - Community Links
    
    Docs Blogs Forums
  - Career Advice
    
    PHP Developer Tips
- Final Congratulations
  - Complete Encyclopedia
    
    All Topics Covered
PHP Extensions
- GD Library
  - imagecreatefromstring
    
    Create from Binary
  - imageflip Function
    
    Flip Image Horizontally
  - imagecropauto Function
    
    Automatic Crop
  - imagefilter Grayscale
    
    Convert to Grayscale
  - imagefilter Brightness
    
    Adjust Brightness Level
  - imagefilter Contrast
    
    Adjust Contrast Level
  - imagefilter Colorize
    
    Tint Image Color
  - imagefilter Edgedetect
    
    Edge Detection Effect
  - imagefilter Emboss
    
    Emboss Effect Filter
  - imagefilter Blur
    
    Gaussian Blur Effect
  - imagefilter Pixelate
    
    Pixelate Image Effect
  - imagettfbbox
    
    Get Text Bounding Box
  - imagettftext
    
    Write TrueType Text
  - imagecopymerge
    
    Watermark Image Merge
  - Practical Example
    
    Create Thumbnail
    
    Add Watermark Text
    
    Resize Proportionally
    
    Crop Image Center
    
    Create Captcha Image
- Imagick
  - new Imagick Object
    
    Create Imagick Instance
  - readImage Method
    
    Load Image File
  - resizeImage Method
    
    Resize with Filter
  - cropImage Method
    
    Crop Image Area
  - rotateImage Method
    
    Rotate by Degrees
  - flipImage Method
    
    Flip Vertically
  - flopImage Method
    
    Flip Horizontally
  - sharpenImage Method
    
    Sharpen Blurry Image
  - blurImage Method
    
    Apply Gaussian Blur
  - negateImage Method
    
    Negate Colors
  - sepiaToneImage Method
    
    Apply Sepia Effect
  - oilPaintImage Method
    
    Oil Paint Effect
  - roundCorners Method
    
    Rounded Corners
  - mergeImageLayers Method
    
    Merge Layers
  - getImageBlob Method
    
    Get Image Binary
  - Practical Example
    
    Create PDF Thumbnail
    
    Convert Image Format
    
    Create Image Strip
- Intl Extension
  - Locale Class
    
    Locale Handling
  - Locale lookup
    
    Find Best Matching Locale
  - NumberFormatter Class
    
    Format Numbers
  - NumberFormatter Currency
    
    Format Money
  - NumberFormatter Percent
    
    Format Percentages
  - NumberFormatter Spellout
    
    Number to Words
  - DateFormatter Class
    
    Format Dates
  - DateFormatter Parse
    
    Parse Date Strings
  - Collator Class
    
    String Comparison
  - Collator Compare
    
    Sort Strings Correctly
  - MessageFormatter Class
    
    Format Messages
  - Transliterator Class
    
    Script Conversion
  - Practical Example
    
    Multi Language Site
- Zip Archive
  - ZipArchive Class
    
    Create Zip Files
  - open Method
    
    Open Zip File
  - addFile Method
    
    Add File to Zip
  - addEmptyDir Method
    
    Add Empty Directory
  - addFromString Method
    
    Add String as File
  - extractTo Method
    
    Extract Zip File
  - deleteName Method
    
    Delete File from Zip
  - renameName Method
    
    Rename File in Zip
  - setPassword Method
    
    Password Protect Zip
  - getFromName Method
    
    Get File Content
  - Practical Example
    
    Create Backup Zip
    
    Extract Uploaded Zip
- FTP
  - ftp_connect Function
    
    Connect to FTP Server
  - ftp_login Function
    
    Login with Credentials
  - ftp_pasv Function
    
    Set Passive Mode
  - ftp_chdir Function
    
    Change Directory
  - ftp_nlist Function
    
    List Files Directory
  - ftp_get Function
    
    Download File
  - ftp_put Function
    
    Upload File
  - ftp_delete Function
    
    Delete File
  - ftp_mkdir Function
    
    Create Directory
  - ftp_rmdir Function
    
    Remove Directory
  - ftp_chmod Function
    
    Set File Permissions
  - Practical Example
    
    Backup to Remote Server
- SSH2
  - ssh2_connect Function
    
    Connect to SSH Server
  - ssh2_auth_password Function
    
    Password Authentication
  - ssh2_auth_pubkey_file Function
    
    Public Key Authentication
  - ssh2_exec Function
    
    Execute Remote Command
  - ssh2_scp_recv Function
    
    Download via SCP
  - ssh2_scp_send Function
    
    Upload via SCP
  - ssh2_sftp Function
    
    SFTP Resource
  - Practical Example
    
    Remote Server Backup
- SOAP
  - SoapClient Class
    
    SOAP Client
  - SoapServer Class
    
    SOAP Server
  - __call Method
    
    Call SOAP Method
  - __getFunctions Method
    
    Get Available Functions
  - __getTypes Method
    
    Get Data Types
  - SoapFault Exception
    
    SOAP Error Handling
  - WSDL Mode
    
    Web Service Description
  - Non WSDL Mode
    
    Manual Configuration
  - SoapHeader Class
    
    Add SOAP Headers
  - Practical Example
    
    Consume Weather API
- LDAP
  - ldap_connect Function
    
    Connect to LDAP Server
  - ldap_bind Function
    
    Authenticate User
  - ldap_search Function
    
    Search Directory
  - ldap_get_entries Function
    
    Get Search Results
  - ldap_add Function
    
    Add New Entry
  - ldap_modify Function
    
    Modify Entry
  - ldap_delete Function
    
    Delete Entry
  - ldap_compare Function
    
    Compare Attribute Value
  - ldap_first_entry Function
    
    Get First Entry
  - ldap_next_entry Function
    
    Get Next Entry
  - Practical Example
    
    Active Directory Auth
PHP Error Solutions
- Parse Error
  - Unexpected T_VARIABLE
    
    Missing Semicolon Fix
  - Unexpected T_STRING
    
    Missing Quote Fix
  - Unexpected T_IF
    
    Misplaced Curly Brace
  - Unexpected T_EOF
    
    Unclosed Bracket Fix
- Fatal Error
  - Class Not Found
    
    Check Autoloader Path
  - Call to Undefined Function
    
    Function Name Spelling
  - Call to Member Function
    
    Object Not Created
  - Cannot Redeclare Function
    
    Use include_once
  - Allowed Memory Exhausted
    
    Increase memory_limit
  - Maximum Execution Time
    
    set_time_limit Increase
- Warning
  - Headers Already Sent
    
    No Output Before Header
  - Cannot Modify Header
    
    Output Buffering Solution
  - Division by Zero
    
    Check Divisor Before Division
  - Invalid Argument Supplied
    
    Check Array Before Foreach
  - file_get_contents Failed
    
    Check File Path Permissions
  - mysqli_fetch_assoc Error
    
    Check Query Result Empty
- Notice
  - Undefined Variable
    
    Initialize Variables Before Use
  - Undefined Index
    
    Check Array Key Exists
  - Undefined Offset
    
    Check Array Length
  - Trying to Get Property
    
    Check Object Exists
- Deprecated
  - Function Deprecated
    
    Use Modern Alternative
  - Curly Brace String Access
    
    Use Square Brackets
  - create_function Deprecated
    
    Use Anonymous Functions
  - mysql_* Functions
    
    Use MySQLi or PDO
- Database Error
  - Connection Refused
    
    Check Database Service
  - Access Denied
    
    Check Username Password
  - Unknown Database
    
    Create Database First
  - Table Doesn't Exist
    
    Run Migrations First
  - Duplicate Entry
    
    Check Unique Constraint
  - Syntax Error
    
    Check SQL Query Syntax
  - Deadlock Found
    
    Retry Transaction Logic
- Session Error
  - session_start Failed
    
    Check Output Before Session
  - Cannot Start Session
    
    Check Session Save Path
- Upload Error
  - UPLOAD_ERR_INI_SIZE
    
    Increase upload_max_filesize
  - UPLOAD_ERR_PARTIAL
    
    Retry File Upload
  - UPLOAD_ERR_NO_FILE
    
    Check Form Enctype
  - UPLOAD_ERR_CANT_WRITE
    
    Check Folder Permissions
- JSON Error
  - JSON_ERROR_SYNTAX
    
    Validate JSON String
  - JSON_ERROR_UTF8
    
    Check Character Encoding
  - JSON_ERROR_DEPTH
    
    Reduce Nesting Level
- cURL Error
  - SSL Certificate Error
    
    Disable Verify Only Dev
  - Connection Timeout
    
    Increase Timeout Value
  - HTTP Code 404
    
    Check Request URL
  - HTTP Code 403
    
    Check Authentication
- Composer Error
  - Class Not Found
    
    Run dump-autoload
  - Memory Limit
    
    Increase Composer Memory
  - Version Conflict
    
    Update Dependencies Carefully
  - Authentication Failed
    
    Check Packagist Token
  - Rate Limit Exceeded
    
    Wait Before Retry
  - SSL Certificate
    
    Update CA Certificates
PHP php.ini
- Core Directives
  - error_reporting Setting
    
    Error Level Configuration
  - display_errors Setting
    
    Show Errors in Browser
  - log_errors Setting
    
    Log Errors to File
  - error_log Setting
    
    Error Log File Path
  - memory_limit Setting
    
    Maximum Memory per Script
  - max_execution_time
    
    Maximum Script Run Time
  - max_input_time
    
    Maximum Input Parsing Time
  - post_max_size
    
    Maximum POST Data Size
  - upload_max_filesize
    
    Maximum Upload File Size
  - max_file_uploads
    
    Maximum Files per Upload
  - date.timezone Setting
    
    Default Timezone
- Session Directives
  - session.save_handler
    
    Session Storage Handler
  - session.save_path
    
    Session File Path
  - session.name
    
    Session Cookie Name
  - session.gc_maxlifetime
    
    Session Lifetime
  - session.cookie_secure
    
    HTTPS Only Cookie
  - session.cookie_httponly
    
    No JavaScript Access
  - session.cookie_samesite
    
    CSRF Protection
- OPcache Directives
  - opcache.enable
    
    Enable Opcode Caching
  - opcache.memory_consumption
    
    OPcache Memory Size
  - opcache.max_accelerated_files
    
    Max Cached Files
  - opcache.revalidate_freq
    
    Check File Changes
  - opcache.validate_timestamps
    
    Development Only
  - opcache.jit
    
    JIT Compilation Enable
  - opcache.jit_buffer_size
    
    JIT Buffer Size
- Upload Directives
  - file_uploads
    
    Enable File Uploads
  - upload_tmp_dir
    
    Temporary Upload Directory
  - upload_max_filesize
    
    Maximum File Size
  - post_max_size
    
    Maximum POST Size
  - max_file_uploads
    
    Maximum Files Count
- Extension Directives
  - extension_dir
    
    Extension Directory Path
  - extension=php
    
    Enable Specific Extension
  - zend_extension
    
    Zend Extension Load
PHP WebSockets
- Ratchet Installation
  - Composer Command
    
    require cboden/ratchet
- Ratchet Server
  - MessageComponentInterface
    
    Server Interface
- Ratchet Methods
  - onOpen Method
    
    New Connection Handler
  - onMessage Method
    
    Receive Message Handler
  - onClose Method
    
    Connection Close Handler
  - onError Method
    
    Error Handler
- Ratchet Server Script
  - Server PHP File
    
    Running the Server
- Ratchet Client
  - JavaScript WebSocket
    
    Client Side Code
- Ratchet Events
  - Connection Event
    
    Client Connected
  - Message Event
    
    Data Received
  - Close Event
    
    Client Disconnected
- BeyondCode WebSocket
  - Installation Command
    
    Composer Require
  - Pusher Integration
    
    Real time Events
  - WebSocket Routes
    
    Channel Definitions
  - Event Broadcasting
    
    Server Sent Events
  - Laravel Integration
    
    Framework Support
- Practical Example
  - Chat Application Setup
    
    Complete Chat System
  - Notification System
    
    Real time Alerts
  - Live Dashboard
    
    Real time Stats
- WebSocket vs AJAX
  - Persistent Connection
    
    One Time Request
- WebSocket vs SSE
  - Bidirectional
    
    Server to Client Only
- Use Cases
  - Real time Games
    
    Multiplayer Gaming
  - Trading Platform
    
    Live Price Updates
  - Collaborative Editing
    
    Multiple User Docs
PHP Machine Learning
- PHP-ML Library
  - Installation Command
    
    Composer Require
- Classification
  - Classification Overview
    
    Predict Categories
  - SVC Classifier
    
    Support Vector Classification
  - kNearestNeighbors
    
    KNN Algorithm
  - NaiveBayes Classifier
    
    Bayes Theorem Based
  - DecisionTree
    
    Tree Based Classification
  - RandomForest
    
    Ensemble Learning Method
- Regression
  - Regression Overview
    
    Predict Continuous Values
  - LinearRegression
    
    Simple Linear Regression
  - MultipleRegression
    
    Multiple Variables Regression
  - LeastSquares
    
    Minimize Error Squares
- Clustering
  - Clustering Overview
    
    Group Similar Data
  - KMeans
    
    K Means Algorithm
  - DBSCAN
    
    Density Based Clustering
- Association
  - Association Rule Learning
    
    Find Relationships
  - Apriori Algorithm
    
    Frequent Itemset Mining
  - Eclat Algorithm
    
    Equivalence Class Transformation
- Feature Extraction
  - Tokenization
    
    Split Text into Tokens
  - Stop Words Removal
    
    Remove Common Words
  - Stemming
    
    Reduce Words to Root
  - TfIdf Calculator
    
    Term Frequency Inverse Document
- Model Evaluation
  - Confusion Matrix
    
    Accuracy Precision Recall
  - Cross Validation
    
    Model Testing Strategy
  - Training Test Split
    
    Data Separation
- Practical Example
  - Spam Detection
    
    Email Classification
  - Sentiment Analysis
    
    Text Emotion Detection
  - Product Recommendation
    
    User Preferences
  - Price Prediction
    
    House Price Forecast
  - Weather Prediction
    
    Temperature Forecast
  - Stock Prediction
    
    Price Trend Forecast
  - Image Classification
    
    Simple Image Recognition
- Datasets
  - Dataset CSV Loading
    
    Import External Data
  - Dataset Array Conversion
    
    Prepare for Training
  - Dataset Splitting
    
    Train Test Split
- Model Persistence
  - Save Model
    
    Serialize Model Object
  - Load Model
    
    Unserialize Saved Model
  - PHP Serialization
    
    Store in File
  - Save Model File
    
    Store Trained Model
  - Load Model File
    
    Restore Saved Model
  - Pickle Alternative
    
    PHP Serialization
- Limitations
  - PHP Not for Deep Learning
    
    Use Python Instead
  - Large Dataset Performance
    
    Memory Constraints
  - PHP Memory Issues
    
    Large Dataset Problems
  - Training Speed
    
    Slower than Python
  - Algorithm Availability
    
    Limited Algorithms
- Use Cases
  - Small Scale ML Projects
    
    PHP Applications
- Pipeline
  - Create Pipeline
    
    Chain Multiple Transformers
  - Add Transformer
    
    Append Processing Step
  - Add Estimator
    
    Append Model Step
  - Fit Pipeline
    
    Train All Steps
  - Predict Pipeline
    
    Process and Predict
- Cross Validation
  - Stratified Split
    
    Maintain Class Balance
  - KFold Split
    
    K Fold Cross Validation
  - Random Split
    
    Shuffle Before Split
- Metrics
  - Accuracy Score
    
    Correct Predictions Ratio
  - Precision Score
    
    Positive Prediction Quality
  - Recall Score
    
    Actual Positive Detection
  - F1 Score
    
    Precision Recall Harmonic Mean
  - Confusion Matrix Display
    
    Actual vs Predicted
- Data Preprocessing
  - Normalization
    
    Scale to Unit Range
  - Standardization
    
    Zero Mean Unit Variance
  - Missing Values
    
    Handle Null Data
  - Label Encoding
    
    Convert Categories to Numbers
  - One Hot Encoding
    
    Binary Column Encoding
- Alternatives
  - TensorFlow PHP
    
    Google TensorFlow Binding
  - ONNX Runtime
    
    Cross Platform ML
PHP Blockchain
- Web3 PHP Library
  - Installation Command
    
    Composer Require Web3
- Web3 PHP
  - Web3 Class
    
    Main Entry Point
  - Eth Module
    
    Ethereum Methods
  - Net Module
    
    Network Methods
  - Personal Module
    
    Account Methods
  - Shh Module
    
    Whisper Protocol
- Blockchain Basics
  - What is Blockchain
    
    Distributed Ledger
  - Blocks Structure
    
    Data Hash Previous Hash
  - Proof of Work
    
    Mining Validation
  - Consensus Algorithm
    
    Network Agreement
- Cryptocurrency
  - Bitcoin Basics
    
    First Cryptocurrency
  - Ethereum Basics
    
    Smart Contract Platform
- Smart Contracts
  - Contract Deployment
    
    Deploy to Blockchain
  - Contract Call
    
    Execute Contract Methods
  - Contract Events
    
    Listen to Events
- Wallet Management
  - Create Wallet
    
    Generate Key Pair
  - Private Key Storage
    
    Secure Key Handling
  - Public Key Derivation
    
    Generate Address
- Transactions
  - Send Transaction
    
    Transfer Cryptocurrency
  - Check Balance
    
    Query Account Balance
  - Transaction Status
    
    Check Confirmation
- Token Management
  - Create Token
    
    Deploy ERC20 Token
  - Token Transfer
    
    Send Tokens
  - Token Balance
    
    Check Token Amount
- API Integration
  - Infura API
    
    Connect to Ethereum
  - Alchemy API
    
    Blockchain Node Service
  - Web3 Provider
    
    HTTP WebSocket IPC
- Practical Example
  - Create Wallet App
    
    Generate Ethereum Wallet
  - Check Balance Tool
    
    Query Address Balance
  - Send ETH Script
    
    Transfer Ethereum
  - Smart Contract Interaction
    
    Call Contract Methods
  - Crypto Payment Gateway
    
    Accept Crypto Payments
PHP Desktop Apps
- NativePHP
  - Introduction
    
    Desktop Apps with PHP
  - Installation Command
    
    NPM Install NativePHP
  - Create Project
    
    Initialize NativePHP App
  - Run App
    
    Start Desktop Application
  - Window Management
    
    Create Multiple Windows
  - Menu System
    
    Add Application Menu
  - Tray Icon
    
    System Tray Integration
  - File Dialog
    
    Open Save Files
  - Database Storage
    
    SQLite Integration
  - Settings Storage
    
    User Preferences Save
  - Keyboard Shortcuts
    
    Hotkey Support
  - Notifications
    
    System Notification Display
- Electron PHP
  - PHP Backend
    
    Electron Frontend
  - ExpressPHP Integration
    
    HTTP Server in PHP
- PHP GTK
  - Introduction
    
    GTK Bindings for PHP
  - Installation
    
    PECL Install PHP GTK
  - Window Creation
    
    GtkWindow Class
  - Widgets Usage
    
    Buttons Labels Inputs
  - Event Handling
    
    Signal Connections
  - CSS Styling
    
    Widget Appearance
- PHP Desktop
  - Introduction
    
    Chrome Embedded PHP
- Use Cases
  - Point of Sale System
    
    Retail Application
  - Inventory Management
    
    Stock Control App
  - School Management
    
    Student Information System
  - Hotel Management
    
    Booking Application
PHP Desktop
- PHP Desktop
  - Installation
    
    Download Package
  - Configuration
    
    Settings JSON File
  - Run Application
    
    EXE File Generation
PHP Mobile Backend
- API Design
  - RESTful Endpoints
    
    Resource Based URLs
  - JSON Response Format
    
    Mobile Friendly Data
  - HTTP Status Codes
    
    Proper Error Responses
  - Versioning Strategy
    
    Maintain Compatibility
- Authentication
  - JWT Implementation
    
    Token Based Auth
  - OAuth2 Server
    
    Security Standard
  - API Keys
    
    Simple Token Auth
  - Social Login
    
    Google Facebook Login
- Push Notifications
  - FCM Integration
    
    Firebase Cloud Messaging
  - APNS Integration
    
    Apple Push Service
  - OneSignal API
    
    Multi Platform Push
  - WebPush Library
    
    Browser Notifications
- File Uploads
  - Image Upload API
    
    Accept Base64 or Multipart
  - Image Processing
    
    Resize Optimize
  - Cloud Storage
    
    Upload to S3
- Database
  - Optimize for Mobile
    
    Send Only Needed Data
  - Pagination Support
    
    Limit Offset Parameters
  - Filters and Sorting
    
    Query Parameters
- Real-time Features
  - WebSocket Server
    
    Live Updates
  - Long Polling
    
    Alternative to WebSocket
  - Server Sent Events
    
    One Way Updates
- Offline Support
  - Data Sync Strategy
    
    Conflict Resolution
  - Last Sync Timestamp
    
    Incremental Updates
- Performance
  - Caching Strategy
    
    Redis Memcached
  - Gzip Compression
    
    Smaller Responses
  - API Gateway
    
    Rate Limit Caching
- Security
  - SSL Certificate
    
    HTTPS Required
  - Input Validation
    
    Protect from Malicious Data
  - Rate Limiting
    
    Prevent Abuse
- Practical Example
  - User Registration API
    
    Sign Up Endpoint
  - User Login API
    
    Authentication Endpoint
  - Profile Management API
    
    Get Update Profile
  - Image Upload API
    
    Profile Picture Upload
  - Push Notification API
    
    Send Push Alert
PHP Legacy Migration
- PHP 5.x to 7.x
  - Minimum PHP Version
    
    Check Current Version
  - Deprecated Features
    
    Remove Old Functions
  - Constructor Change
    
    Parent construct Call
  - Reserved Keywords
    
    Avoid New Keywords
  - Error Handling
    
    Throwable Interface
  - MySQL to MySQLi
    
    Replace mysql Functions
  - Register Globals
    
    No Longer Supported
  - Magic Quotes
    
    Remove addslashes Calls
  - Safe Mode
    
    Safe Mode Removed
- PHP 7.x to 8.x
  - Minimum PHP Version
    
    Check PHP 7 Compatibility
  - Named Arguments
    
    Backward Compatibility
  - Union Types
    
    Type Declaration Changes
  - Attributes
    
    Annotation Syntax Change
  - Match Expression
    
    Switch Replacement
  - Stringable Interface
    
    __toString Implementation
  - Constructor Promotion
    
    Property Declaration Change
  - Fatal Errors
    
    Type Error Exceptions
  - Deprecated Functions
    
    Remove or Replace
  - JSON Extension
    
    JSON Exception Throwing
- Extension Changes
  - MySQL Extension Removed
    
    Use MySQLi PDO
  - Mcrypt Removed
    
    Use OpenSSL
  - EREG Functions Removed
    
    Use PCRE
  - Magic Quotes Removed
    
    Manual Escape
- Code Analysis
  - Static Analysis Tool
    
    PHPStan Level Check
  - Deprecated Detection
    
    Rector Tool
  - Composer Check
    
    composer validate Command
- Testing
  - Unit Tests Before Migration
    
    Ensure Functionality
  - Regression Testing
    
    No Breaking Changes
- Staged Migration
  - Small Steps First
    
    Gradual Upgrade
  - Feature Toggle
    
    Rollback Capability
- Server Configuration
  - PHP Version Update
    
    Update php.ini
  - Extension Installation
    
    Enable New Extensions
- Stuck Projects
  - No Longer Maintained
    
    Isolate Upgrade
  - Container Wrapper
    
    Legacy Container
  - Gradual Rewrite
    
    New Code New Version
  - API Layer
    
    Migration Over Time
  - Parallel Running
    
    Both Versions Together
PHP Advanced Queues
- RabbitMQ Setup
  - Install RabbitMQ
    
    Ubuntu Installation
- RabbitMQ PHP
  - php-amqplib Package
    
    Composer Require
  - Connection Setup
    
    Create Connection Channel
  - Queue Declaration
    
    Declare Queue
  - Producer Code
    
    Send Message to Queue
  - Consumer Code
    
    Receive Process Messages
  - Exchange Types
    
    Direct Fanout Topic
  - Queue Binding
    
    Connect Exchange to Queue
  - Message Acknowledgment
    
    Confirm Processing
  - Dead Letter Queue
    
    Handle Failed Messages
  - Delayed Messages
    
    Schedule Future Processing
  - RPC Pattern
    
    Remote Procedure Call
- Kafka Setup
  - Install Kafka
    
    Download and Extract
- Kafka PHP
  - RdKafka Library
    
    PECL Install RdKafka
  - Producer Configuration
    
    Broker List Setup
  - Producer Send
    
    Publish Message to Topic
  - Consumer Configuration
    
    Group ID Assignment
  - Consumer Subscribe
    
    Subscribe to Topics
  - Consumer Consume
    
    Read and Process Messages
  - Consumer Commit
    
    Offset Management
  - Partition Assignment
    
    Manual or Automatic
  - Avro Serialization
    
    Schema Registry
- Redis Pub Sub
  - Subscribe Pattern
    
    Listen to Channels
  - Publish Message
    
    Send to Channel
- Queue Comparison
  - RabbitMQ vs Kafka
    
    Use Cases Comparison
  - Redis Pub Sub vs Queues
    
    Message Persistence
- Queue Use Cases
  - Email Sending Queue
    
    Async Email Processing
  - Image Processing Queue
    
    Resize Optimize Offline
  - Report Generation Queue
    
    Long Running Tasks
  - Webhook Delivery Queue
    
    Retry on Failure
  - Data Sync Queue
    
    Database Synchronization
- Queue Monitoring
  - Queue Length Monitoring
    
    Alert on Buildup
  - Failed Message Tracking
    
    Dead Letter Monitoring
  - Processing Time Tracking
    
    Performance Metrics
PHP Advanced Monitoring
- Prometheus Setup
  - Install Prometheus
    
    Download and Run
- Prometheus Configuration
  - prometheus.yml File
    
    Target Configuration
- PHP Metrics
  - prometheus_client_php
    
    Composer Require
  - Counter Metric
    
    Track Request Count
  - Gauge Metric
    
    Track Active Connections
  - Histogram Metric
    
    Request Duration
  - Summary Metric
    
    Quantile Tracking
  - Expose Endpoint
    
    metrics.php Route
- Grafana Setup
  - Install Grafana
    
    Download and Start
- Grafana Dashboard
  - Add Prometheus Source
    
    Data Connection
  - Create Dashboard
    
    Visualization Panels
  - Alert Rules
    
    Threshold Notifications
  - Variable Support
    
    Dynamic Dashboards
- Custom Metrics
  - Database Query Count
    
    Monitor Performance
  - Cache Hit Ratio
    
    Optimize Caching
  - API Response Time
    
    SLI Tracking
  - Error Rate Tracking
    
    SLO Monitoring
  - Business Metrics
    
    Order Count Revenue
- Log Aggregation
  - ELK Stack Setup
    
    Elasticsearch Logstash Kibana
  - Monolog to Elasticsearch
    
    Log Shipping
  - Log Analysis
    
    Dashboard Creation
- Alerting
  - Prometheus Alertmanager
    
    Notification Routing
  - Email Alerts
    
    Send on Threshold
  - Slack Integration
    
    Team Notifications
  - PagerDuty Integration
    
    On Call Alerts
- Tracing
  - OpenTelemetry PHP
    
    Distributed Tracing
  - Jaeger Setup
    
    Trace Visualization
  - Trace Propagation
    
    Cross Service Tracking
PHP Advanced CI CD
- CI Pipeline Example
  - GitHub Actions Full
    
    Complete Workflow
  - GitLab CI Full
    
    Complete Pipeline
  - Jenkins Pipeline
    
    Jenkinsfile Setup
  - Circle CI Config
    
    CircleCI YAML
  - Travis CI Config
    
    travis.yml File
- Testing in CI
  - PHPUnit Execution
    
    Automated Test Run
  - Code Coverage Report
    
    Upload to Codecov
  - Static Analysis Run
    
    PHPStan Psalm Check
  - Linting Run
    
    PHPCS or PHP CS Fixer
- Deployment Strategies
  - FTP Deployment
    
    Upload to Server
  - RSYNC Deployment
    
    Sync File Changes
  - SSH Deployment
    
    Run Remote Commands
  - Docker Build
    
    Build and Push Image
  - Kubernetes Apply
    
    Deploy to K8s
  - Blue Green Deployment
    
    Zero Downtime
  - Canary Deployment
    
    Gradual Rollout
- Secrets Management
  - Environment Secrets
    
    CI Variables
  - Vault Integration
    
    HashiCorp Vault
  - AWS Secrets Manager
    
    Cloud Secrets
- Caching Strategy
  - Composer Cache
    
    Speeding Up Builds
  - NPM Cache
    
    Frontend Dependencies
  - Docker Layer Cache
    
    Faster Image Builds
- Parallel Jobs
  - Matrix Builds
    
    Multiple PHP Versions
  - Parallel Test Execution
    
    Faster Pipeline
- Notifications
  - CI Status Notifications
    
    Slack Email Teams
  - Deployment Notifications
    
    Success Failure Alerts
- Real World Example
  - Laravel Deployment
    
    Complete Pipeline
  - WordPress Deployment
    
    CI CD Setup
  - API Project Pipeline
    
    Testing Deployment
PHP Checklist
- Code Review Checklist
  - Before Commit
    
    Check Syntax Errors
    
    Remove Debug Code
    
    Add Proper Comments
  - Code Quality
    
    Follow PSR Standards
    
    No Hardcoded Values
    
    Use Type Declarations
  - Security Check
    
    No SQL Injection Risk
    
    No XSS Vulnerability
    
    Password Properly Hashed
    
    CSRF Token Implemented
    
    File Uploads Validated
    
    Sensitive Data Encrypted
  - Performance Check
    
    No Queries in Loops
    
    Use Indexed Columns
    
    Cache Expensive Data
  - Error Handling
    
    Try Catch Implemented
    
    Proper Error Messages
    
    Log Errors Not Display
- Deployment Checklist
  - Before Deploy
    
    Running Tests Passed
    
    Composer Install Optimized
    
    Environment Variables Set
    
    Cache Cleared
    
    Database Migrations Ready
    
    File Permissions Correct
    
    Backup Database Created
  - After Deploy
    
    Check Error Logs Empty
    
    Verify Critical Features
    
    Monitor Performance Spikes
- Security Checklist
  - Authentication
    
    Use Strong Password Policy
    
    Implement Two Factor Auth
    
    Lock After Failed Attempts
  - Authorization
    
    Check Permissions on Every Request
    
    Use Role Based Access Control
  - Session Management
    
    Regenerate ID After Login
    
    Set Cookie Secure Flags
    
    Implement Session Timeout
  - Data Validation
    
    Validate All Inputs
    
    Sanitize All Outputs
    
    Use Whitelist Not Blacklist
  - File Security
    
    Store Files Outside Webroot
    
    Scan Uploaded Files for Malware
  - API Security
    
    Implement Rate Limiting
    
    Use API Keys or JWT
    
    Validate Content Type
  - Dependency Security
    
    Update Composer Regularly
    
    Scan for Vulnerabilities
  - Server Security
    
    Use HTTPS Only
    
    Hide PHP Version
    
    Set Proper Directory Permissions
- Performance Checklist
  - Code Optimization
    
    Avoid Functions in Loops
    
    Use Single Quotes
    
    Use isset Over array_key_exists
    
    Unset Large Variables
  - Caching Strategy
    
    Enable OPcache
    
    Use Redis for Sessions
    
    Cache Database Queries
    
    Implement Page Cache
  - Database Optimization
    
    Add Proper Indexes
    
    Use Explain Command
    
    Select Only Needed Columns
    
    Use Limit Clause
  - Asset Optimization
    
    Minify CSS JS Files
    
    Use CDN for Static Assets
    
    Compress Images
PHP Cheatsheet
- Basic Syntax
  - Variables
    
    $var = value
  - Constants
    
    define NAME value
  - Data Types
    
    string int float bool array
  - Comments
    
    // or / / or #
- Control Structures
  - if else
    
    if condition else
  - switch
    
    switch value case break
  - match
    
    match value default
- Loops
  - for Loop
    
    for init condition increment
  - while Loop
    
    while condition
  - foreach Loop
    
    foreach array as key value
- Functions
  - Define Function
    
    function name params
  - Return Type
    
    function name type
  - Arrow Function
    
    fn param expression
  - Anonymous Function
    
    function use vars
- Arrays
  - Create Array
    
    array or brackets
  - Add Element
    
    array key value
  - Remove Element
    
    unset array key
  - Check Exists
    
    isset array key
  - Array Functions
    
    count push pop shift
- Strings
  - Create String
    
    single or double quotes
  - String Functions
    
    strlen strpos substr
    
    str_replace explode implode
    
    trim strtolower strtoupper
- Superglobals
  - GET Data
    
    $_GET key
  - POST Data
    
    $_POST key
  - Session Data
    
    $_SESSION key
  - Cookie Data
    
    $_COOKIE key
  - Server Data
    
    $_SERVER key
  - Files Data
    
    $_FILES key
- Database
  - MySQLi Connect
    
    mysqli_connect
  - PDO Connect
    
    new PDO dsn
  - Query Execute
    
    mysqli_query or PDO query
  - Fetch Data
    
    mysqli_fetch_assoc or PDO fetch
  - Prepared Statement
    
    bind_param or bindValue
  - Last Insert ID
    
    lastInsertId or insert_id
- Session
  - Session Start
    
    session_start
  - Set Variable
    
    $_SESSION key value
  - Destroy Session
    
    session_destroy
  - Regenerate ID
    
    session_regenerate_id
- Cookie
  - Set Cookie
    
    setcookie name value
  - Get Cookie
    
    $_COOKIE name
  - Delete Cookie
    
    setcookie name past expiry
- File Handling
  - Read File
    
    file_get_contents
  - Write File
    
    file_put_contents
  - Delete File
    
    unlink
  - Check Exists
    
    file_exists
  - Get Size
    
    filesize
- File Upload
  - Check Upload
    
    is_uploaded_file
  - Move File
    
    move_uploaded_file
  - Get Error
    
    $_FILES error
- OOP
  - Class Definition
    
    class ClassName
  - Object Creation
    
    new ClassName
  - Properties
    
    public private protected
  - Methods
    
    public function method
  - Constructor
    
    __construct
  - Destructor
    
    __destruct
  - Inheritance
    
    extends Keyword
  - Abstract Class
    
    abstract class
  - Interface
    
    interface implements
  - Trait
    
    trait use
  - Static
    
    static method property
  - Magic Methods
    
    __get __set __call
- Security
  - Password Hash
    
    password_hash
  - Password Verify
    
    password_verify
  - Prevent XSS
    
    htmlspecialchars
  - CSRF Token
    
    bin2hex random_bytes
  - SQL Prevention
    
    Prepared Statements
  - Input Filter
    
    filter_var
  - Session Secure
    
    session_regenerate_id
  - Cookie Secure
    
    httponly secure flags
- JSON
  - Encode JSON
    
    json_encode
  - Decode JSON
    
    json_decode
  - Last Error
    
    json_last_error
  - Error Message
    
    json_last_error_msg
- cURL
  - Initialize
    
    curl_init
  - Set Options
    
    curl_setopt
  - Execute
    
    curl_exec
  - Close
    
    curl_close
  - Get Error
    
    curl_error
  - Get Info
    
    curl_getinfo
- Date Time
  - Current Timestamp
    
    time
  - Format Date
    
    date format timestamp
  - Parse Date
    
    strtotime
  - Create DateTime
    
    new DateTime
  - DateTime Format
    
    datetime format
  - DateInterval
    
    new DateInterval
  - Timezone
    
    new DateTimeZone
- Regular Expressions
  - preg_match
    
    Match Pattern
  - preg_match_all
    
    All Matches
  - preg_replace
    
    Replace Pattern
  - preg_split
    
    Split by Pattern
  - preg_quote
    
    Escape Pattern
PHP Interview Prep
- Basic Questions
  - What is PHP Answer
    
    PHP Hypertext Preprocessor
  - PHP Full Form
    
    Personal Home Page to PHP
  - PHP vs JavaScript
    
    Side Differences
  - PHP vs Python
    
    Use Case Differences
- Variables Scope
  - Local vs Global
    
    Inside Outside Function
  - Static Variable
    
    Persistence Between Calls
- Data Types
  - Type Juggling
    
    Automatic Type Conversion
- Operators
  - == vs ===
    
    Value vs Type Comparison
  - ?? Operator
    
    Null Coalescing Usage
    
    Spaceship Return Values
- Control Structures
  - switch vs match
    
    Strict vs Loose
- Functions
  - Pass by Reference
    
    Ampersand Parameter
  - Anonymous Function
    
    Closure Example
  - Arrow Function
    
    fn Syntax Shortcut
- Arrays
  - array_map vs foreach
    
    Functional vs Iterative
  - array_merge vs +
    
    Difference Behavior
- Strings
  - strpos vs preg_match
    
    Simple vs Complex
- OOP
  - Abstract vs Interface
    
    When to Use Which
  - Trait Purpose
    
    Code Reuse Solution
  - final Keyword
    
    Prevent Inheritance
  - Magic Methods List
    
    Construct Destruct Get Set
- Database
  - MySQLi vs PDO
    
    Which to Choose
  - Prepared Statement Benefit
    
    SQL Injection Prevention
- Security
  - XSS Prevention
    
    htmlspecialchars
  - CSRF Prevention
    
    Token Method
  - Password Hashing
    
    password_hash
  - SQL Prevention
    
    Prepared Statements
- Session
  - Session vs Cookie
    
    Server vs Client
  - session_regenerate_id
    
    Prevent Fixation
- File Upload
  - move_uploaded_file
    
    Safe Move Purpose
- Error Handling
  - try catch finally
    
    Exception Flow
- Performance
  - OPcache Purpose
    
    Opcode Caching
  - Static Method Advantage
    
    Faster Execution
- PHP 8
  - Constructor Promotion
    
    Less Boilerplate
  - Match Expression
    
    No Fallthrough Benefit
  - Nullsafe Operator
    
    ?-> Chaining Safe
  - Union Types
    
    Multiple Type Support
  - Attributes
    
    Annotation Syntax
  - Enums
    
    Type Safe Constants
  - Readonly Properties
    
    Write Once Only
- Composer
  - Autoloading
    
    PSR-4 Standard
  - Version Constraints
    
    Caret Tilde Wildcard
- Testing
  - PHPUnit Purpose
    
    Unit Testing
  - Assertions Types
    
    Common Assert Methods