Respect\Validation\Rules\Nif::validateDni PHP Метод

private validateDni ( integer $number, integer $control )
$number	integer
$control	integer

    private function validateDni($number, $control)
    {
        return mb_substr('TRWAGMYFPDXBNJZSQVHLCKE', $number % 23, 1) === $control;
    }

Nif