/**
* Save a specified feed object corresponding to given parameters to the
* cache
*/
protected function _cacheSaveFeed(GenericXmlSyndicationFeed $feedObj, $feed, $format, $params)
{
$filename = $this->_cacheFilename($feed, $format, $params);
$cacheContent = array('content-type' => $feedObj->contentType, 'content' => $feedObj->getContent(false));
file_put_contents($filename, serialize($cacheContent), LOCK_EX);
}