The SplObserver interface2024-03-29T06:07:44+00:00tag:php.net,2009-10-13:/manual/en/file/class.splobserverPhDPHP Documentation GroupSplObserver::update -- Receive update from subject2024-03-29T06:07:44+00:00tag:php.net,2009-10-13:/manual/en/splobserver.update