<?php

function url_domain()

{

    $curr = strpos($_SERVER['PHP_SELF'], '/') !== false ?

            preg_replace('/(.*)()(\/?)(.)*/i', '\1', dirname($_SERVER['PHP_SELF'])) :

            dirname($_SERVER['PHP_SELF']);

    $root = str_replace('\\', '/', $curr);

    if (substr($root, -1) != '/')

    {

        $root .= '/';

    }

    return $root;

}

echo(url_domain());exit();

?>