How can i get the object id from loop in mongodb

So I want to get the object id from the mongodb using foreach loop.How can I achieve that?

$cursor2 = $videoCollection->find(['$text' => ['$search' => 'C:/Users/']]);

$cursorArray = json_decode(json_encode($cursor2->toArray(),true));

 foreach ($cursorArray as $key=>$document) {
   print_r($document->_id);
}

How can I get the Object Id from this?

 [_id] => stdClass Object
        (
            [$oid] => 6246c1c3b5ad6657936980b3
        )