PHP MongoDB $and / $all querying

If I want to select documents that meet two specific criteria, how do I format the query? Right now I开发者_开发技巧 currently have this:

$params = array('$all' => array(
              array('parent.id'=>'1'),
              array('owner_id'=>'8')
          ));
$data = $collection->find($params);

This query brings me back no results...any ideas??

parent.id is integer?

Maybe that:

$params = array('$all' => array(
              array('parent.id'=>1),
              array('owner_id'=>8)
          ));
$data = $collection->find($params);

Ouh.. Use it:

$params = array('$all' => array(
              array('parent'=>array('id'=>'1')),
              array('owner_id'=>8)
          ));
$data = $collection->find($params);