VIPnytt / RobotsTxtParser

     */

    public function validateIP($ipAddress = null)

    {

        if ($ipAddress === null) {

            $parsed = parse_url($this->uri);

            $ipAddress = isset($parsed['host']) ? $parsed['host'] : null;

        }

        return (

            filter_var($ipAddress, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4) ||

            filter_var(trim($ipAddress, '[]'), FILTER_VALIDATE_IP, FILTER_FLAG_IPV6)

     */

    public function validateHost($host = null)

    {

        if ($host === null) {

            $parsed = parse_url($this->uri);

            $host = isset($parsed['host']) ? $parsed['host'] : $parsed['path'];

        }

        return (

            preg_match("/^([a-z\d](-*[a-z\d])*)(\.([a-z\d](-*[a-z\d])*))*$/i", $host) //valid chars check

            && preg_match("/^.{1,253}$/", $host) //overall length check

     */

    public function validateScheme($scheme = null)

    {

        if ($scheme === null) {

            $parsed = parse_url($this->uri);

            $scheme = isset($parsed['host']) ? $parsed['host'] : $parsed['path'];

        }

        return in_array($scheme, $this->schemes);

    }