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    • PHP Manual
    • Appendices


    • History of PHP and Related Projects
      • History of PHP
      • History of PHP related projects
      • Books about PHP
      • Publications about PHP
    • Migrating from PHP 7.4.x to PHP 8.0.x
      • New Features
      • Backward Incompatible Changes
      • Deprecated Features
      • Other Changes
    • Migrating from PHP 7.3.x to PHP 7.4.x
      • New Features
      • New Classes and Interfaces
      • New Functions
      • New Global Constants
      • Backward Incompatible Changes
      • Deprecated Features
      • Removed Extensions
      • Other Changes
      • Windows Support
    • Migrating from PHP 7.2.x to PHP 7.3.x
      • New Features
      • New Functions
      • New Global Constants
      • Backward Incompatible Changes
      • Deprecated Features
      • Other Changes
      • Windows Support
    • Migrating from PHP 7.1.x to PHP 7.2.x
      • New features
      • New functions
      • New global constants
      • Backward incompatible changes
      • Deprecated features in PHP 7.2.x
      • Other changes
    • Migrating from PHP 7.0.x to PHP 7.1.x
      • New features
      • New functions
      • New global constants
      • Backward incompatible changes
      • Deprecated features in PHP 7.1.x
      • Changed functions
      • Other changes
      • Windows Support
    • Migrating from PHP 5.6.x to PHP 7.0.x
      • Backward incompatible changes
      • New features
      • Deprecated features in PHP 7.0.x
      • Changed functions
      • New functions
      • New Classes and Interfaces
      • New Global Constants
      • Changes in SAPI Modules
      • Removed Extensions and SAPIs
      • Other Changes
    • Migrating from PHP 5.5.x to PHP 5.6.x
      • Backward incompatible changes
      • New features
      • Deprecated features in PHP 5.6.x
      • Changed functions
      • New functions
      • OpenSSL changes in PHP 5.6.x
      • Other changes to extensions
      • New global constants
    • Migrating from PHP 5.4.x to PHP 5.5.x
      • What has changed in PHP 5.5.x
      • Backward Incompatible Changes
      • New features
      • Deprecated features in PHP 5.5.x
      • Changed Functions
      • New Functions
      • New Classes and Interfaces
      • New Methods
      • Other changes to extensions
      • New Global Constants
      • Changes to INI file handling
      • Changes to PHP Internals
    • Migrating from PHP 5.3.x to PHP 5.4.x
      • What has changed in PHP 5.4.x
      • Backward Incompatible Changes
      • New features
      • Changes in SAPI modules
      • Deprecated features in PHP 5.4.x
      • Changed Functions
      • New Functions
      • New Classes and Interfaces
      • New Methods
      • Removed Extensions
      • Other changes to extensions
      • New Global Constants
      • Changes to INI file handling
      • Other changes
    • Migrating from PHP 5.2.x to PHP 5.3.x
      • What has changed in PHP 5.3.x
      • Backward Incompatible Changes
      • New features
      • Changes made to Windows support
      • Changes in SAPI modules
      • Deprecated features in PHP 5.3.x
      • Undeprecated features in PHP 5.3.x
      • New Parameters
      • New Functions
      • New stream wrappers
      • New stream filters
      • New Class Constants
      • New Methods
      • New Extensions
      • Removed Extensions
      • Other changes to extensions
      • New Classes
      • New Global Constants
      • Changes to INI file handling
      • Other changes
    • Migrating from PHP 5.1.x to PHP 5.2.x
      • What has changed in PHP 5.2.x
      • Backward Incompatible Changes
      • New Error Messages
      • Changes in PHP datetime support
      • New Parameters
      • New Functions
      • New Methods
      • Removed Extensions
      • New Extensions
      • New Classes
      • New Global Constants
      • New Class Constants
      • New INI Configuration Directives
      • Error Reporting
      • Other Enhancements
    • Migrating from PHP 5.0.x to PHP 5.1.x
      • Key PHP 5.1.x features
      • Changes in reference handling
      • Reading []
      • Integer values in function parameters
      • Class and object changes
      • Extensions
      • Date/time support
      • Changes in database support
      • Checking for E_STRICT
    • Migrating from PHP 4 to PHP 5.0.x
      • What has changed in PHP 5.0.x
      • Backward Incompatible Changes
      • CLI and CGI
      • Migrating Configuration Files
      • New Functions
      • New Directives
      • Databases
      • New Object Model
      • Error Reporting
    • Debugging in PHP
      • About debugging in PHP
    • Configure options
      • List of core configure options
    • php.ini directives
      • List of php.ini directives
      • List of php.ini sections
      • Description of core php.ini directives
    • Extension List/Categorization
      • Alphabetical
      • Membership
      • State
    • List of Function Aliases
    • List of Reserved Words
      • List of Keywords
      • Predefined Classes
      • Predefined Constants
      • List of other reserved words
    • List of Resource Types
    • List of Available Filters
      • String Filters
      • Conversion Filters
      • Compression Filters
      • Encryption Filters
    • List of Supported Socket Transports
      • Internet Domain: TCP, UDP, SSL, and TLS
      • Unix Domain: Unix and UDG
    • PHP type comparison tables
    • List of Parser Tokens
    • Userland Naming Guide
      • Global Namespace
      • Rules
      • Tips
    • About the manual
      • Formats
      • About user notes
      • How to read a function definition (prototype)
      • PHP versions documented in this manual
      • How to find more information about PHP
      • How to help improve the documentation
      • How we generate the formats
      • Translations
    • Creative Commons Attribution 3.0
    • Index listing
      • Function and Method listing
      • Example listing
    • Changelog


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