Builds SimplePie object based on RSS or Atom feed from URL. Parameters $urlstring|string[]required URL of feed to retrieve. If an array of URLs, the feeds are merged using SimplePie’s multifeed feature. See also http://simplepie.org/wiki/faq/typical_multifeed_gotchas Return SimplePie|WP_Error SimplePie object on success or WP_Error object on failure. More Information fetch_feed caches results for