Pop\Color\Space\Hex::isValid PHP Метод

    protected function isValid()
    {
        $valid = true;
        $hexValues = array('0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f');
        $hex = str_split($this->hex);
        foreach ($hex as $h) {
            if (!in_array($h, $hexValues)) {
                $valid = false;
            }
        }
        return $valid;
    }