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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