public function getHasChanged($cache)
    {
        $timestamps = $this->getTimestamps($cache, (array) $this->tags);
        return $timestamps !== $this->data;
    }
public function getHasChanged($cache)
    {
        $timestamps = $this->getTimestamps($cache, (array) $this->tags);
        return $timestamps !== $this->data;
    }
public function getHasChanged ( $ cache ) { $ timestamps = $ this -> getTimestamps ( $ cache , ( array ) $ this -> tags ) ; return $ timestamps !== $ this -> data ; }
Performs the actual dependency checking.
@param Cache $cache the cache component that is currently evaluating this dependency
@return boolean whether the dependency is changed or not.
Performs the actual dependency checking .