$_SERVER

$_SERVER['PHP_SELF']

$_SERVER['GATEWAY_INTERFACE']

$_SERVER['SERVER_ADDR']

$_SERVER['SERVER_NAME']

$_SERVER['SERVER_SOFTWARE']

$_SERVER['SERVER_PROTOCOL']

$_SERVER['REQUEST_METHOD']

$_SERVER['REQUEST_TIME']

$_SERVER['QUERY_STRING']

$_SERVER['DOCUMENT_ROOT']

$_SERVER['HTTP_ACCEPT']

$_SERVER['HTTP_ACCEPT_CHARSET']

$_SERVER['HTTP_ACCEPT_ENCODING']

$_SERVER['HTTP_ACCEPT_LANGUAGE']

$_SERVER['HTTP_CONNECTION']

$_SERVER['HTTP_HOST']

$_SERVER['HTTP_REFERER']

$_SERVER['HTTP_USER_AGENT']

$_SERVER['HTTPS']

$_SERVER['REMOTE_ADDR']

$_SERVER['REMOTE_HOST']

$_SERVER['REMOTE_PORT']

$_SERVER['REMOTE_USER']

$_SERVER['REDIRECT_REMOTE_USER']

$_SERVER['SCRIPT_FILENAME']

$_SERVER['SERVER_ADMIN']

$_SERVER['SERVER_PORT']

$_SERVER['SERVER_SIGNATURE']

$_SERVER['PATH_TRANSLATED']

$_SERVER['SCRIPT_NAME']

$_SERVER['REQUEST_URI']

$_SERVER['PHP_AUTH_DIGEST']

$_SERVER['PHP_AUTH_USER']

$_SERVER['PHP_AUTH_PW']

$_SERVER['AUTH_TYPE']

$_SERVER['PATH_INFO']

$_SERVER['ORIG_PATH_INFO']

$_SERVER['HTTP_COOKIE']