NinjaMutex\Tests\Mock\MockMemcached::add PHP Метод

    public function add($key, $value, $expiration = null, &$udf_flags = null)
    {
        if (!$this->available) {
            return false;
        }
        if (false === $this->get($key)) {
            self::$data[$key] = (string) $value;
            return true;
        }
        return false;
    }