List of super global variables

$GLOBALS array of global variables (just like the global keyword, which allows a function to access the globally variable internally)
$_server Server environment variable array
$_request array of variables entered by all users, including input from $_get, $_post, $_cookie
$_post array of variables passed to the script via the POST method
$_get An array of variables passed to the script by the GET method
$_files array of variables related to file uploads
$_ENV environment variable Array
$_cookie array of COOKIE variables
$_session Session Variable Array

List of super global variables