url.php
protected function chompHost(&$url)
    {
        if (preg_match('!^(//)(.*?)(/.*|\?.*|#.*|$)!', $url, $matches)) {
            $url = $matches[3];

            return $matches[2];
        }
        if (preg_match('!(.*?)(\.\./|\./|/|\?|#|$)(.*)!', $url, $matches)) {
            $tlds = self::getAllTopLevelDomains();
            if (preg_match('/[a-z0-9\-]+\.(' . $tlds . ')/i', $matches[1])) {
                $url = $matches[2] . $matches[3];

                return $matches[1];
            } elseif (preg_match('/[a-z0-9\-]+\.[a-z0-9\-]+\.[a-z0-9\-]+/i', $matches[1])) {
                $url = $matches[2] . $matches[3];

                return $matches[1];
            }
        }

        return false;
    }
protected function chompHost(&$url)
    {
        if (preg_match('!^(//)(.*?)(/.*|\?.*|#.*|$)!', $url, $matches)) {
            $url = $matches[3];

            return $matches[2];
        }
        if (preg_match('!(.*?)(\.\./|\./|/|\?|#|$)(.*)!', $url, $matches)) {
            $tlds = self::getAllTopLevelDomains();
            if (preg_match('/[a-z0-9\-]+\.(' . $tlds . ')/i', $matches[1])) {
                $url = $matches[2] . $matches[3];

                return $matches[1];
            } elseif (preg_match('/[a-z0-9\-]+\.[a-z0-9\-]+\.[a-z0-9\-]+/i', $matches[1])) {
                $url = $matches[2] . $matches[3];

                return $matches[1];
            }
        }

        return false;
    }
Extracts the host part of an incoming URL. Includes the port number part. Will extract the
host if it starts with // or it has a top level domain or it has at least two dots.

@param string $url    URL so far. The host will be removed.

@return string        Host part guess or false.