Respect\Validation\Rules\Size::isValidSize PHP Метод

    private function isValidSize($size)
    {
        if (null !== $this->minValue && null !== $this->maxValue) {
            return $size >= $this->minValue && $size <= $this->maxValue;
        }
        if (null !== $this->minValue) {
            return $size >= $this->minValue;
        }
        return $size <= $this->maxValue;
    }