private function isOutdated($key, $time)
    {
        return ($this->getTouchByKey($key) + $this->getKeyTtl($key)) < $time;
    }
private function isOutdated($key, $time)
    {
        return ($this->getTouchByKey($key) + $this->getKeyTtl($key)) < $time;
    }
private function isOutdated ( $ key , $ time ) { return ( $ this -> getTouchByKey ( $ key ) + $ this -> getKeyTtl ( $ key ) ) < $ time ; }
Check whether key is outdated

@param string $key
@param integer $time Current timestamp
@return boolean
Check whether key is outdated