$sm=memory_get_usage();
				$items=array();
				foreach ($app_categories as $cate) {
					$app_items = $cate->getItems();
					if (count($app_items)) foreach ($app_items as $app_item ) {
						$items[]=array("id"=>$app_item->id,"type"=>$app_item->type,"name"=>$app_item->name,
							"alias"=>$app_item->alias,"elements"=>null);
						};
					unset($app_items);
				}
				unset($app_items);
				echo "mem used for ".count($items)." items - ".(memory_get_usage()-$sm);