Respect\Validation\Rules\Locale\PlVatin::validate PHP Метод

    public function validate($input)
    {
        if (!is_scalar($input)) {
            return false;
        }
        if (!preg_match('/^\\d{10}$/', (string) $input)) {
            return false;
        }
        $weights = [6, 5, 7, 2, 3, 4, 5, 6, 7];
        $targetControlNumber = $input[9];
        $calculateControlNumber = 0;
        for ($i = 0; $i < 9; ++$i) {
            $calculateControlNumber += $input[$i] * $weights[$i];
        }
        $calculateControlNumber = $calculateControlNumber % 11;
        return $targetControlNumber == $calculateControlNumber;
    }