* Superglobals — Superglobals are built-in variables that are always available in all scopes
* $GLOBALS — References all variables available in global scope
* $_SERVER — Server and execution environment information
* $_GET — HTTP GET variables
* $_POST — HTTP POST variables
* $_FILES — HTTP File Upload variables
* $_REQUEST — HTTP Request variables
* $_SESSION — Session variables
* $_ENV — Environment variables
* $_COOKIE — HTTP Cookies
* $php_errormsg — The previous error message
* $HTTP_RAW_POST_DATA — Raw POST data
* $http_response_header — HTTP response headers
* $argc — The number of arguments passed to script
* $argv — Array of arguments passed to script
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