public function offsetExists($offset)
    {
        if (false === $result = parent::offsetExists($offset)) {
            if ($this->_cache) {
                $result = apcu_exists($this->_cache_prefix.'-'.$offset);
            }
        }

        return $result;
    }
public function offsetExists($offset)
    {
        if (false === $result = parent::offsetExists($offset)) {
            if ($this->_cache) {
                $result = apcu_exists($this->_cache_prefix.'-'.$offset);
            }
        }

        return $result;
    }
public function offsetExists ( $ offset ) { if ( false === $ result = parent :: offsetExists ( $ offset ) ) { if ( $ this -> _cache ) { $ result = apcu_exists ( $ this -> _cache_prefix . '-' . $ offset ) ; } } return $ result ; }
Check if the offset exists.

@param   int     The offset

@return bool
Check if the offset exists .