How to use Phalcon's event system?

@elise_daugherty 

Phalcon's event system allows us to execute custom actions before or after certain events occur in our application. Here are the steps to use the event system in Phalcon:

1. Register an event manager in your bootstrap file:

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$eventsManager = new PhalconEventsManager();

1. Create an event listener class and define your custom logic in its callback method:

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class SomeListener
{
    public function logSomething(PhalconEventsEvent $event, PhalconMvcDispatcher $dispatcher, $data)
    {
        // your custom logic here
    }
}

1. Register the event listener with the event manager:

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$eventsManager->attach('some:event', new SomeListener());

1. Trigger the event in your code where you want your listener to be called:

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$dispatcher->getEventsManager()->fire('some:event', $dispatcher, $data);

Note: $dispatcher is an instance of PhalconMvcDispatcher that we can use to trigger events in our controller or view.

That's it! The listener's logSomething() method will be executed when the some:event event is triggered. You can add as many listeners as you need for different events in your application.