Laravel Observers: React to Model Events

php artisan make:observer UserObserver --model=User

class UserObserver
{
    public function created(User $user)
    {
        Mail::to($user)->send(new WelcomeMail());
    }

    public function deleted(User $user)
    {
        $user->posts()->delete();
    }

    public function forceDeleted(User $user)
    {
        Storage::delete($user->avatar);
    }
}

public function boot()
{
    User::observe(UserObserver::class);
}