public function set($key, \DateTime $time)
    {
        $key = $this->prefix.$key;
        if (!($old_time = $this->memcache->get($key)) || $old_time < $time->getTimestamp()) {
            return $this->memcache->set($key, $time->getTimestamp());
        }

        return true;
    }
public function set($key, \DateTime $time)
    {
        $key = $this->prefix.$key;
        if (!($old_time = $this->memcache->get($key)) || $old_time < $time->getTimestamp()) {
            return $this->memcache->set($key, $time->getTimestamp());
        }

        return true;
    }
@param string $key
@param \DateTime $time

@return bool