public function &offsetGet($offset)
    {
        if (!isset($this->data[$offset])) {
            $this->extraKeys[$offset] = true;
        }
        return $this->data[$offset];
    }
public function &offsetGet($offset)
    {
        if (!isset($this->data[$offset])) {
            $this->extraKeys[$offset] = true;
        }
        return $this->data[$offset];
    }
public function & offsetGet ( $ offset ) { if ( ! isset ( $ this -> data [ $ offset ] ) ) { $ this -> extraKeys [ $ offset ] = true ; } return $ this -> data [ $ offset ] ; }
Get the offset value

@param  string $offset
@return mixed
Get the offset value