Valitron\Validator::validateUrlActive PHP 메소드

    protected function validateUrlActive($field, $value)
    {
        foreach ($this->validUrlPrefixes as $prefix) {
            if (strpos($value, $prefix) !== false) {
                $host = parse_url(strtolower($value), PHP_URL_HOST);
                return checkdnsrr($host, 'A') || checkdnsrr($host, 'AAAA') || checkdnsrr($host, 'CNAME');
            }
        }
        return false;
    }