Superglobal variables in PHP

PHP has a list of built-in variables, which are known as superglobal variables. It provide information about the PHP script’s environment.

The variables are always available in all parts of the script. The following table shows the list of PHP superglobal variables:

Superglobal Variables	Meaning
$GLOBALS	Returns an array that contains global variables. The variable names are used to select which part of the array to access.
$_SERVER	Returns data about the webserver environment.
$_GET	Return data from `GET` requests.
$_POST	Return data from `POST` requests.
$_COOKIE	Return data from HTTP cookies
$_FILES	Return data from POST file uploads.
$_ENV	Return information about the script’s environment.
$_REQUEST	Return data from the HTTP request
$_SESSION	Return variables registered in a session

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