PHP

$_SERVER["DOCUMENT_ROOT"]  
$_SERVER["PHP_SELF"]  
$_SERVER["REMOTE_ADDR"]  
$_SERVER["HTTP_USER_AGENT"]  
$_SERVER["HTTP_REFERER"]  
$_SERVER["HTTP_ACCEPT_LANGUAGE"]  
$_SERVER['HTTP_HOST']  
$_SERVER['PATH_INFO']  
$_SERVER['PATH_TRANSLATED']  
$_SERVER['REQUEST_URI']  
$_SERVER['REMOTE_PORT']  
$_SERVER['QUERY_STRING']  
$_SERVER['SERVER_ADDR']  
$_SERVER['SERVER_ADMIN']  
$_SERVER['SERVER_NAME']  
$_SERVER['SERVER_SIGNATURE']  
$_SERVER['REQUEST_METHOD']  
$_SERVER["UNIQUE_ID"]  
$_SERVER["HTTP_REFERER"]  
$_SERVER["SERVER_SOFTWARE"]  
$_SERVER["SERVER_PORT"]  
$_SERVER["REMOTE_HOST"]