ManaPHP\Http\Filter::_filter_url PHP Метод

    protected function _filter_url($value)
    {
        $value = trim($value);
        if (filter_var($value, FILTER_VALIDATE_URL) !== false) {
            $parts = explode('://', $value, 2);
            $scheme = strtolower($parts[0]);
            $path = $parts[1];
            if ($scheme !== 'http' && $scheme !== 'https') {
                return null;
            } else {
                return $scheme . '://' . $path;
            }
        } else {
            return null;
        }
    }