Observer

Creating an observer

Observers are used for listening to livecycle callbacks of a certain model in Laravel.
These listeners may listen to any of the following actions:

creating
created
updating
updated
saving
saved
deleting
deleted
restoring
restored

Here is an example of an observer.

UserObserver

<?php

namespace App\Observers;

/**
 * Observes the Users model
 */
class UserObserver 
{
    /**
     * Function will be triggerd when a user is updated
     *
     * @param Users $model
     */
     public function updated($model)
     {
         // execute your own code
     }
}

As shown in the user observer, we listen to the updated action, however before this class actually listens to the user model we first need to register it inside the EventServiceProvider.

EventServiceProvider

<?php 

namespace App\Providers;

use Illuminate\Contracts\Events\Dispatcher as DispatcherContract;
use Illuminate\Foundation\Support\Providers\EventServiceProvider as ServiceProvider;

use App\Models\Users;
use App\Observers\UserObserver;

/**
 * Event service provider class
 */
class EventServiceProvider extends ServiceProvider
{
    /**
     * Boot function
     *
     * @param DispatcherContract $events
     */
    public function boot(DispatcherContract $events)
    {
        parent::boot($events);

        // In this case we have a User model that we want to observe
        // We tell Laravel that the observer for the user model is the UserObserver
        Users::observe(new UserObserver());
    }
}

Now that we have registered our observer, the updated function will be called every time after saving the user model.