/** * Turns on caching and checks if there is a recent version of this feed in the cache. * If there is, an HTTP redirect header is sent. * To effectively use caching, you should create the FeedCreator object and call this method * before anything else, especially before you do the time consuming task to build the feed * (web fetching, for example). * * @param string $format format the feed should comply to. Valid values are: * "PIE0.1" (deprecated), "mbox", "RSS0.91", "RSS1.0", "RSS2.0", "OPML", "ATOM0.3". * @param string $filename optional the filename where a recent version of the feed is saved. If not specified, the filename is $_SERVER["PHP_SELF"] with the extension changed to .xml (see _generateFilename()). * @param int $timeout optional the timeout in seconds before a cached version is refreshed (defaults to 3600 = 1 hour) */ function useCached($format = "RSS0.91", $filename = "", $timeout = 3600) { $this->_setFormat($format); $this->_feed->useCached($filename, $timeout); }