Zend Framework 1.10.9 Manual

Single Atom <entry> elements are also valid by themselves. Usually the URL for an entry is the feed's URL followed by /<entryId>, such as http://atom.example.com/feed/1, using the example URL we used above.

If you read a single entry, you will still have a Zend_Feed_Atom object, but it will automatically create an "anonymous" feed to contain the entry.

$feed = new Zend_Feed_Atom('http://atom.example.com/feed/1');
echo 'The feed has: ' . $feed->count() . ' entry.';

$entry = $feed->current();

Alternatively, you could instantiate the entry object directly if you know you are accessing an <entry>-only document:

$entry = new Zend_Feed_Entry_Atom('http://atom.example.com/feed/1');
echo $entry->title();