Instantiating a SimplePie object in WordPress

gistfile1.php

		/* Create the SimplePie object */
		$this->feed = new SimplePie(); 
		/* Set the URL of the feed you're retrieving */
		$this->feed->set_feed_url( $this->source );
		/* Tell SimplePie to cache the feed using WordPress' cache class */
		$this->feed->set_cache_class( 'WP_Feed_Cache' );
		/* Tell SimplePie to use the WordPress class for retrieving feed files */
		$this->feed->set_file_class( 'WP_SimplePie_File' );
		/* Tell SimplePie how long to cache the feed data in the WordPress database */
		$this->feed->set_cache_duration( apply_filters( 'wp_feed_cache_transient_lifetime', 43200, $this->source ) );
		/* Run any other functions or filters that WordPress normally runs on feeds */
		do_action_ref_array( 'wp_feed_options', array( &$this->feed, $this->source ) ); 
		/* Initiate the SimplePie instance */
		$this->feed->init(); 
		/* Tell SimplePie to send the feed MIME headers */
		$this->feed->handle_content_type();