February 11, 2011 
Definition:
function fetch_feed($url) {}
Build SimplePie object based on RSS or Atom feed from URL.
Parameters
- string $url: URL to retrieve feed
Return values
returns:WP_Error object on failure or SimplePie object on success
Defined filters
- wp_feed_cache_transient_lifetime
apply_filters('wp_feed_cache_transient_lifetime', 43200, $url)
Defined actions
- wp_feed_options
do_action_ref_array( 'wp_feed_options', array( &$feed, $url ) );
Source code
function fetch_feed($url) {
require_once (ABSPATH . WPINC . '/class-feed.php');
$feed = new SimplePie();
$feed->set_feed_url($url);
$feed->set_cache_class('WP_Feed_Cache');
$feed->set_file_class('WP_SimplePie_File');
$feed->set_cache_duration(apply_filters('wp_feed_cache_transient_lifetime', 43200, $url));
do_action_ref_array( 'wp_feed_options', array( &$feed, $url ) );
$feed->init();
$feed->handle_content_type();
if ( $feed->error() )
return new WP_Error('simplepie-error', $feed->error());
return $feed;
}
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A HitchHackers guide through WordPress 
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