Super Global Variable- PHPDark.com

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Super Global Variable

In php there eight variables. These eight variables are fixed, constant and can't be changed. This variable is started with $_. For several reasons, they are known as super global variables. Different variables have different duty to do. Some works with file, some works with request and some works to send data to sever. Let’s see the below table for better clearance.

Syntax	Usage
$_FILES	Works with File(Upload, Check Type)
$_GET	Receives Data
$_POST	Sends Data to Server
$_REQUEST	Responds to The Request
$_SESSION	Set Session for User Access
$_COOKIE	Set Cookie for User Identification
$_SERVER	Request Server and Get Server Info
$_ENV

$_ENV is used not so much but has usage also.