Respect\Validation\Rules\CountryCode::__construct PHP Метод

    public function __construct($set = self::ALPHA2)
    {
        $index = array_search($set, self::getAvailableSets(), true);
        if (false === $index) {
            throw new ComponentException(sprintf('"%s" is not a valid country set for ISO 3166-1', $set));
        }
        $this->set = $set;
        $this->index = $index;
    }