Adapter/TagcacheAdapter.php
public function inc($key, $expire = 0)
    {
        $this->getLock($key);
        $this->set($key,(int) $this->get($key)+1);
        $this->releaseLock($key);

        return true;
    }
public function inc($key, $expire = 0)
    {
        $this->getLock($key);
        $this->set($key,(int) $this->get($key)+1);
        $this->releaseLock($key);

        return true;
    }
increment a key
@param  type    $key
@param  type    $expire
@return boolean