What are superglobals in PHP?

Superglobals are built-in variables that PHP creates by itself. They are available in every place of your script (inside functions and classes also), and you do not need the global keyword to use them.

Superglobal	Use
$_GET	Data sent in the URL
$_POST	Data sent by a form using the POST method
$_REQUEST	Data of GET, POST and cookies together
$_SESSION	Session data of the current user
$_COOKIE	Cookies sent by the browser
$_FILES	Details of uploaded files
$_SERVER	Server and request information, like the method and IP address
$_ENV	Environment variables
$GLOBALS	Access to the global variables

<?php
echo $_SERVER["REQUEST_METHOD"];
?>

Output:

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