xpressengine / xe-core

            $parsed = parse_url($input);

            if (isset($parsed['host'])) {

                $arr = explode('.', $parsed['host']);

                foreach ($arr as $k => $v) {

                    $conv = $this->_decode($v);

                    if ($conv) {

                        $arr[$k] = $conv;

                    }

                }

                $parsed['host'] = join('.', $arr);

                $return = (empty($parsed['scheme']) ? '' : $parsed['scheme'] . (strtolower($parsed['scheme']) == 'mailto' ? ':' : '://')).

                        (empty($parsed['user']) ? '' : $parsed['user'] . (empty($parsed['pass']) ? '' : ':' . $parsed['pass']) . '@').

                        (empty($parsed['fragment']) ? '' : '#' . $parsed['fragment']);

            } else { // parse_url seems to have failed, try without it

                $arr = explode('.', $input);

                foreach ($arr as $k => $v) {

                    $conv = $this->_decode($v);

                    $arr[$k] = ($conv) ? $conv : $v;

                }

                $return = join('.', $arr);

            }

        } else { // Otherwise we consider it being a pure domain name string