Language Reference

• Basic syntax
  • Escaping from HTML
  • Instruction separation
  • Comments
• Types
  • Introduction
  • Booleans
  • Integers
  • Floating point numbers
  • Strings
  • Arrays
  • Objects
  • Resources
  • NULL
  • Pseudo-types and variables used in this documentation
  • Type Juggling
• Variables
  • Basics
  • Predefined Variables
  • Variable scope
  • Variable variables
  • Variables From External Sources
• Constants
  • Syntax
  • Magic constants
• Expressions
• Operators
  • Operator Precedence
  • Arithmetic Operators
  • Assignment Operators
  • Bitwise Operators
  • Comparison Operators
  • Error Control Operators
  • Execution Operators
  • Incrementing/Decrementing Operators
  • Logical Operators
  • String Operators
  • Array Operators
  • Type Operators
• Control Structures
  • Introduction
  • if
  • else
  • elseif/else if
  • Alternative syntax for control structures
  • while
  • do-while
  • for
  • foreach
  • break
  • continue
  • switch
  • declare
  • return
  • require
  • Scope Resolution Operator (::)
  • parent
  • Serializing objects - objects in sessions
  • The magic functions __sleep and __wakeup
  • References inside the constructor
  • Comparing objects
• Classes and Objects (PHP 5)
  • Introduction
  • The Basics
  • Autoloading Objects
  • Constructors and Destructors
  • Visibility
  • Scope Resolution Operator (::)
  • Static Keyword
  • Class Constants
  • Class Abstraction
  • Object Interfaces
  • Overloading
  • Object Iteration
  • Patterns
  • Magic Methods
  • Final Keyword
  • Object cloning
  • Comparing objects
  • Reflection
  • Type Hinting
  • Late Static Bindings
  • Objects and references
• Namespaces
  • Namespaces overview
  • Defining namespaces
  • Declaring sub-namespaces
  • Defining multiple namespaces in the same file
  • Using namespaces: Basics
  • Namespaces and dynamic language features
  • namespace keyword and __NAMESPACE__ constant
  • Using namespaces: Aliasing/Importing
  • Global space
  • Using namespaces: fallback to global function/constant
  • Name resolution rules
  • FAQ: things you need to know about namespaces
• Exceptions
  • Extending Exceptions
• References Explained
  • What References Are
  • What References Do
  • What References Are Not
  • Passing by Reference
  • Returning References
  • Unsetting References
  • Spotting References
• $_ENV — Environment variables
• $_COOKIE — HTTP Cookies
• $php_errormsg — The previous error message
• $HTTP_RAW_POST_DATA — Raw POST data
• $http_response_header — HTTP response headers
• $argc — The number of arguments passed to script
• $argv — Array of arguments passed to script

Predefined Exceptions

• Exception
• ErrorException

Predefined Interfaces

• Traversable — The Traversable interface
• Iterator — The Iterator interface
• IteratorAggregate — The IteratorAggregate interface
• ArrayAccess — The ArrayAccess interface
• Serializable — The Serializable interface

Context options and parameters

• Socket context options — Socket context option listing
• HTTP context options — HTTP context option listing
• FTP context options — FTP context option listing
• SSL context options — SSL context option listing
• CURL context options — CURL context option listing
• Phar context options — Phar context option listing
• Context parameters — Context parameter listing