PHP/Superglobals

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Beginning with PHP version 4.1, a set of global predefined arrays are available to provide access to server information. These arrays, plus one which provides a reference to all globals, are commonly referred to as "superglobals". There is no mechanism in PHP for user-defined superglobals.

Superglobals are always in scope without using the PHP/global keyword.

$GLOBALS

Contains a reference to every variable which is currently available within the global scope of the script. The keys of this array are the names of the variables.

$_SERVER

Variables set by the web server or otherwise directly related to the execution environment of the current script.

$_GET

Variables provided to the script via the requested URL query string.

$_POST

Variables provided to the script via HTTP POST.

$_COOKIE

Variables provided to the script via HTTP cookies.

$_FILES

Variables provided to the script via HTTP post file uploads.

$_ENV

Server environment variables available to the script. These are typically determined by the web server and the user space it executes within.

$_REQUEST

Variables provided to the script via the GET, POST, and COOKIE input mechanisms. These shouldn't automatically be trusted.