Stripe\Util\Util::isList PHP 메소드

    public static function isList($array)
    {
        if (!is_array($array)) {
            return false;
        }
        // TODO: generally incorrect, but it's correct given Stripe's response
        foreach (array_keys($array) as $k) {
            if (!is_numeric($k)) {
                return false;
            }
        }
        return true;
    }