Super Globals - PHP Tutorials

PHP - Hypertext Preprocessor

PHP	Hypertext Preprocessor
Developer	Rasmus Ledorf
Year	1994

PHP - Super Globals

Super Globals are built in variable that are always available in all scope. in other words Super Globals are pre-defined variable which means that they are always accessible, regardless of scope - and you can access them from any function, class or file without having to do anything special.
These Super Globals are introduced in the PHP version 4.1.The Super Globals which makes PHP as super attractive and effective, The each super global has some different features which can be access from the anywhere of the site, some super Globals are $_GET, $_POST, $COOKIE, $_REQUEST, $_SERVER, $_SESSION are key elements to the website and website builder. The features of each super globals are described below.

Super Globals	Description
$_GET	Data sent to the PHP Script in URL
$_POST	Data sent to PHP Script via HTTP POST. This is normaly a form with method of POST.
$_COOKIE	Data available to the PHP Script via HTTP Cookies.
$_REQUEST	Combination of $_GET, $_POST and $_COOKIE
$_SESSION	Data available to PHP Script that has previously been stored in a Session.
$_SERVER	Data available to PHP Script from the web server itself.
$_ENV	Data available to PHP Script for the environment in which PHP is wroking
$_FILES	Data available to a PHP Scripts from HTTP POST file uploads
$GLOBALS	Store every variable with global scope

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