get_id()

class SimplePie_Item {
	get_id ( [(bool) $hash = false] )
}

Returns the unique identifier for the posting. This is most helpful in writing code to check for new items in a feed.

• Available since SimplePie Beta 2.

If set to true, SimplePie will return a unique MD5 hash for the item. If set to false, it will check <guid>, <link>, and <title> before defaulting to the hash.

$feed = new SimplePie();
$feed->set_feed_url('http://simplepie.org/blog/feed/');
$feed->init();
$feed->handle_content_type();
 
foreach ($feed->get_items() as $item)
{
	$prev_ids = array('guid1', 'guid2', 'guid3', 'guid4');
	if (in_array($item->get_id(true), $prev_ids))
	{
		echo "This item is already stored.";
	}
	else
	{
		echo "This is a new item!";
	}
}

• SimplePie
• SimplePie_Item