Finde mappen hvor index er placeret?

echo $_SERVER['SERVER_NAME'] . $_SERVER['PHP_SELF'];

    function site_url( $postfix = "" )
    {
        $protocol = (!empty($_SERVER['HTTPS'])) ? "https://" : "http://";
        $port = ($_SERVER["SERVER_PORT"] == "80" || $_SERVER["SERVER_PORT"] == "443") ? "" : (":".$_SERVER["SERVER_PORT"]);
        
        if(!empty($postfix) && substr($postfix, 0, 1) != "/")
            $postfix = "/".$postfix;
            
        $host = $_SERVER["HTTP_HOST"];
        
        $postfix = str_replace( $protocol . $host, '', $postfix);
    
        return $protocol . $host . $port . $postfix;
    }

echo site_url(str_replace(basename($_SERVER["PHP_SELF"]), "", $_SERVER["PHP_SELF"]));