... 3.0.3 - 3.0.18 only, PHP 4 >= 4.0.0) hw_InCollections -- check if object ids in collections . array hw_incollections ( int connection, array object_id_array, array collection_id_array, int return_collections) . ... When the fourth parameter return_collections is 0, the subset of object ids that is part of the collections (i.e., the documents or collections that are children of one or more collections of collection ids or their subcollections, recursively) is returned as an array. ...