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Predefined Variables

Predefined Variables

PHP provides a large number of predefined variables to all scripts. The variables represent everything from external variables to built-in environment variables, last error messages to last retrieved headers.

See also the FAQ titled "How does register_globals affect me?"

Superglobals — Superglobals are built-in variables that are always available in all scopes
$GLOBALS — References all variables available in global scope
$_SERVER — Server and execution environment information
$_GET — HTTP GET variables
$_POST — HTTP POST variables
$_FILES — HTTP File Upload variables
$_REQUEST — HTTP Request variables
$_SESSION — Session variables
$_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

Related Code Examples

	Is_serialized() before passing variables to unserialize() Categories : PHP, Serialize
	Accessing GET and PUT variables with HTTP_GET_VARS on Win2K. Categories : PHP, Windows 2000, Variables
	set file ini class - Provides a simple ini-type settings file interface. Great for saving and reading variables quick between executions. Categories : PHP, PHP Classes, Filesystem

	Check parameters validity. Paranoia was designed to check the validity of the parameters that a php page will receive after a form submission. It can be used to check the variables sent by POST or GET Categories : Algorithms, HTML and PHP, PHP, Variables
	Using the Return() function to return multiple variables. Categories : PHP
	Functions to read a template file and fill in PHP variables. It will also fill in array variables, displaying parts of the template multiple times. Categories : PHP, Variables, Filesystem
	STR - a Perl-like string manipulator class - The str class provides 4 perl-like methods for manipulating strings and other scalar variables. Categories : PHP, PHP Classes, Perl, Strings
	PHP Dump in html format the contents of one array variable with a recursive list of the nested array variables inside. Categories : PHP, Arrays, Variables
	Include a file inside of a function and have the included variables be global. Categories : PHP, Variables, Global Variables
	How to display a PHP variable value from a selectbox without reloading the page by merging PHP and Javascript variables. Categories : PHP, Java Script, Variables
	Script to check values being submitted by POST or GET method from a form. This script may help diagnose what variables are being supplied by a browser to other php scripts. Categories : HTML, Variables, Debugging, PHP, HTTP
	Initialize global variables for every field in a table. This is the generic version. It does not require phplib. Categories : Global Variables, MySQL, PHP, Variables
	IdealMySQL Database Class - Connect and Query a mysql database including INSERT \| DELETE \| UPDATE \| REPLACE \| DROP \| SELECT \| SHOW \| DESCRIBE \| EXPLAIN, Catch errors and email them,Check variables to make sure they only contain particular characters. Categories : PHP, PHP Classes, Databases, MySQL
	Passing Variables By Reference Categories : PHP, Beginner Guides, Variables

Predefined Variables

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