Tutorial Basic SimplePie Usage

You'll need a of copy SimplePie for the include right at the top here.
require_once('inc/simplepie.inc');

$feed = new SimplePie();

$feed->set_feed_url(array(
'http://search.twitter.com/search.atom?q=movie'
));

$feed->enable_cache(true);
$feed->set_cache_location('cache');
$feed->set_cache_duration(15);

$feed->init();