Sokil\Mongo\Validator\CardNumberValidator::validateField PHP Метод

    public function validateField(Structure $document, $fieldName, array $params)
    {
        if (!$document->get($fieldName)) {
            return;
        }
        $carsNumber = $document->get($fieldName);
        if (is_numeric($carsNumber) && 0 === $this->getMod($carsNumber)) {
            return;
        }
        if (!isset($params['message'])) {
            $params['message'] = 'Value of field "' . $fieldName . '" is not valid card number at ' . get_called_class();
        }
        $document->addError($fieldName, $this->getName(), $params['message']);
    }