PHP Super Global Variables
PHP super globals are predefined array variables that provide important information about the php running environments and the information of the running php script.
$GLOBALS contains all the global variables. All of the following global variables are elements of $GLOBALS.
$_SERVER contains information about the web server information.
$_REQUEST contains information from user inputs, $_GET, $_POST, $_COOKIE are elements inside it.
$_GET contains information of GET requests from a form submission.
$_POST contains information of POST requests from a form submission.
$_COOKIE contains HTTP cookie information.
$_FILES contains information from POST file uploads.
$_ENV contains information about the script environment.
$_SESSION contains information of any variables registered in a session.
To see all the global variables:
<?php echo "<pre>"; echo var_dump($GLOBALS); echo "</pre>";
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