- var_dump: documentation ( source)
<?php
var_dump($_FILES);
var_dump($GLOBALS);# — References all variables available in global scope
var_dump($_SERVER);# — Server and execution environment information
var_dump($_GET);# — HTTP GET variables
var_dump($_POST);# — HTTP POST variables
var_dump($_FILES);# — HTTP File Upload variables
var_dump($_REQUEST);# — HTTP Request variables
var_dump($_SESSION);# — Session variables
var_dump($_ENV);# — Environment variables
var_dump($_COOKIE);# — HTTP Cookies
var_dump($php_errormsg);# — The previous error message
var_dump($HTTP_RAW_POST_DATA);#— Raw POST data
var_dump($http_response_header);# — HTTP response headers
var_dump($argc);# — The number of arguments passed to script
var_dump($argv);# — Array of arguments passed to script