ElggRewriteTester::guessSubdirectory PHP Method

    public function guessSubdirectory($url)
    {
        $elements = parse_url($url);
        if (!$elements || !isset($elements['path'])) {
            return false;
        }
        $subdir = trim(dirname($elements['path']), '/');
        if (!$subdir) {
            return false;
        } else {
            return "/{$subdir}/";
        }
    }