protected function doClearItem(array $item, $prefix)
    {
        $id = $item['info'];
        $key = substr($id, strrpos($id, ':') + 1);
        $res = true;

        if ('' === $prefix || 0 === strpos($id, $prefix)) {
            $res = $this->deleteItem($key);
        }

        return $res;
    }