Obter url atual com o PHP

//Função
function selfURL(){
list($prot)    = explode('/',strtolower($_SERVER['SERVER_PROTOCOL']));
$s        = $_SERVER['HTTPS'] == 'on' ? 's' : '';
$port        = $_SERVER['SERVER_PORT'] == '80' ? '' : ':'.$_SERVER['SERVER_PORT'];
return $prot.$s.'://'.$_SERVER['SERVER_NAME'].$port.$_SERVER['REQUEST_URI'];
}

//Faz o print da url
echo selfURL();