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Laravel Events & Listeners — Clean System Explained

Laravel's Event system allows you to decouple logic by firing events and handling them through listeners. It improves code separation and flexibility.

Step 1: Events are triggered actions — like "UserRegistered".

Step 2: Listeners respond to those events — like "SendWelcomeEmail".

Step 3: Generate both using:
php artisan make:event UserRegistered
php artisan make:listener SendWelcomeEmail --event=UserRegistered

Step 4: Register events in EventServiceProvider inside $listen array.

Step 5: Fire an event using:
event(new UserRegistered($user))

Step 6: Handle event in Listener's handle() method.

Step 7: Events promote loose coupling — useful for post-registration, logging, or async tasks.

Step 8: For queued listeners, add implements ShouldQueue to the Listener.

Step 9: Use events for clean separation of concerns — not all logic belongs in controllers.

Step 10: Use events to trigger multiple listeners if needed — one event can notify many actions.

Step 11: Common use cases: sending emails, logging, notifications, webhook calls.

Step 12: Test with:
php artisan event:generate to auto-create missing events/listeners.

Step 13: You can use broadcast for real-time events with Pusher/WebSockets.

Step 14: Avoid logic in event classes — keep it in the listeners.

Step 15: Events improve scalability by breaking logic into clean, testable units.