Logging value changes from Entities
If you do not want to persist the changes to a database, you can log the changes instead. It's your decision if you want to write the changes to a log file, send changes via email, or any other log handler.
We recommend to choose Monolog, but you can use any PSR-3-Logger.
Preparing the LogHandler
When constructing your event manager, you have to pass the \Watcher\UpdateHandler\LogHandler to the FlushListener. The LogHandler constructor expects an instance of an \Psr\Log\LoggerInterface:
// Create a PSR-3-Logger
$logger = new Logger('entity-logger');
$logger->pushHandler(new StreamHandler('path/to/your.log'));
// [1] Detailed setup:
$listener = new FlushListener();
$listener->pushUpdateHandler(new LogHandler($logger));
$eventManager = new EventManager();
$eventManager->addEventListener(array(Events::onFlush), $listener);
$eventManager->addEventListener(array(Events::postLoad), new LoadListener());
$em = EntityManager::create($dbParams, $config, $eventManager);
// [2] Short setup:
$em = EntityManager::create($dbParams, $config, Watcher::createEventManager(new LogHandler($logger)));