Description:
------------
When storing data that came from a SimpleXMLObject to an apc cache with apc_store the data will be lost upon retrieval.


Seems related to bug #8118.

Reproduce code:
---------------
$data = ""XML File from Youtube API"";
$xml = simplexml_load_string($data);
foreach ($xml->entry as $entry)
{
$media = $entry->children('http://search.yahoo.com/mrss/');
$title = $media->group->title;
$videos[] = array("title" => $title);
}

storing and refetching $videos will yield an empty array (keys intact, data lost).

typecasting $title to string works around this.

so "$title = (string) $media->group->title;" in above example fixes it.


Expected result:
----------------
Expected array I stored to cache.

Actual result:
--------------
Got array with keys intact but no data.