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Predefined Variables

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PHP provides predefined variables that represent external variables, built-in environment variables, and other information about the execution environment, such as the number and values of the arguments passed to the script in the CLI environment.

Superglobals Globals Server Get Post Files Request Session Env Cookie Phperrormsg Httpresponseheader Argc Argv

In this section

$GLOBALS

References all variables available in global scope

$_COOKIE

HTTP Cookies

$_ENV

Environment variables

$_FILES

HTTP File Upload variables

$_GET

Query string variables

$_POST

Form data from HTTP POST requests

$_REQUEST

HTTP Request variables

$_SERVER

Server and execution environment information

$_SESSION

Session variables

$argc

The number of arguments passed to script

$argv

Array of arguments passed to script

$http_response_header

HTTP response headers

$php_errormsg

The previous error message

Superglobals

Built-in variables that are always available in all scopes

Source: language/predefined/variables.xml · from the official PHP manual (php/doc-en)