function &_getItems($a_obj_id, $a_use_subtree_by_id = false) { static $cache = array(); if (isset($cache[$a_obj_id])) { return $cache[$a_obj_id]; } $cache[$a_obj_id] =& ilLPCollections::_getItems($a_obj_id, $a_use_subtree_by_id); return $cache[$a_obj_id]; }