Table of Contents
Event.php
SomeEvent.php
Listeners
EventListener.php
Home PHP Framework Laravel Laravel - Event Handling

Laravel - Event Handling

Aug 27, 2024 am 10:50 AM
laravel

Events provide a simple observer implementation which allows a user to subscribe and listen to various events triggered in the web application. All the event classes in Laravel are stored in the app/Events folder and the listeners are stored in the app/Listeners folder.

The artisan command for generating events and listeners in your web application is shown below −

php artisan event:generate

This command generates the events and listeners to the respective folders as discussed above.

Event Generator

Events and Listeners serve a great way to decouple a web application, since one event can have multiple listeners which are independent of each other. The events folder created by the artisan command includes the following two files: event.php and SomeEvent.php. They are shown here −

Event.php

<?php
namespace AppEvents;
abstract class Event{
   //
}

As mentioned above, event.php includes the basic definition of class Event and calls for namespace AppEvents. Please note that the user defined or custom events are created in this file.

SomeEvent.php

<?php

namespace AppEvents;

use AppEventsEvent;
use IlluminateQueueSerializesModels;
use IlluminateContractsBroadcastingShouldBroadcast;

class SomeEvent extends Event{
   use SerializesModels;
   /**      * Create a new event instance.
      *
      * @return void
   */
   
   public function __construct() {
      //
   }
   
   /**      * Get the channels the event should be broadcast on.
      *
      * @return array
   */
   
   public function broadcastOn() {
      return [];
   }
}

Observe that this file uses serialization for broadcasting events in a web application and that the necessary parameters are also initialized in this file.

For example, if we need to initialize order variable in the constructor for registering an event, we can do it in the following way −

public function __construct(Order $order) {
   $this->order = $order;
}

Listeners

Listeners handle all the activities mentioned in an event that is being registered. The artisan command event:generate creates all the listeners in the app/listeners directory. The Listeners folder includes a file EventListener.php which has all the methods required for handling listeners.

EventListener.php

<?php

namespace AppListeners;

use AppEventsSomeEvent;
use IlluminateQueueInteractsWithQueue;
use IlluminateContractsQueueShouldQueue;

class EventListener{
   /**      * Create the event listener.
      *
      * @return void
   */
   
   public function __construct() {
      //
   }

   /**      * Handle the event.
      *
      * @param SomeEvent $event
      * @return void
   */
   
   public function handle(SomeEvent $event) {
      //
   }
}

As mentioned in the code, it includes handle function for managing various events. We can create various independent listeners that target a single event.

The above is the detailed content of Laravel - Event Handling. For more information, please follow other related articles on the PHP Chinese website!

Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Hot AI Tools

Undress AI Tool

Undress AI Tool

Undress images for free

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

ArtGPT

ArtGPT

AI image generator for creative art from text prompts.

Stock Market GPT

Stock Market GPT

AI powered investment research for smarter decisions

Hot Tools

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

How to use Eloquent in Laravel How to use Eloquent in Laravel Aug 21, 2025 pm 02:30 PM

Create models and migration: Use phpartisanmake:modelPost-m to generate models and migration files, define the table structure and run phpartisanmigrate; 2. Basic CRUD operations: use Post::all(), find(), create(), save() and delete() methods to query, create, update and delete data; 3. Use Eloquent association: define belongsTo and hasMany relationships in the model, and use the with() method to preload the associated data to avoid N 1 query problems; 4. Eloquent query: use query constructor to chain calls such as where

How to create a social network with Laravel How to create a social network with Laravel Sep 01, 2025 am 06:39 AM

Yes,youcancreateasocialnetworkwithLaravelbyfollowingthesesteps:1.SetupLaravelusingComposer,configurethe.envfile,enableauthenticationviaBreeze/Jetstream/Fortify,andrunmigrationsforusermanagement.2.Implementcorefeaturesincludinguserprofileswithavatarsa

How to use Laravel's Task Scheduling How to use Laravel's Task Scheduling Aug 31, 2025 am 06:07 AM

Laravel's TaskScheduling system allows you to define and manage timing tasks through PHP, without manually editing the server crontab, you only need to add a cron task that is executed once a minute to the server: *cd/path-to-your-project&&phpartisanschedule:run>>/dev/null2>&1, and then all tasks are configured in the schedule method of the App\Console\Kernel class; 1. Defining tasks can use command, call or exec methods, such as $schedule-

How to work with Polymorphic Relationships in Laravel How to work with Polymorphic Relationships in Laravel Aug 25, 2025 am 10:56 AM

PolymorphicrelationshipsinLaravelallowamodellikeCommentorImagetobelongtomultiplemodelssuchasPost,Video,orUserusingasingleassociation.2.Thedatabaseschemarequires{relation}_idand{relation}_typecolumns,exemplifiedbycommentable_idandcommentable_typeinaco

How to internationalize a Laravel application How to internationalize a Laravel application Aug 22, 2025 pm 02:31 PM

Create language files: Create subdirectories for each language (such as en, es) in the resources/lang directory and add messages.php file, or use JSON file to store translation; 2. Set application language: read the request header Accept-Language through middleware or detect language through URL prefix, set the current language using app()->setLocale(), and register the middleware in Kernel.php; 3. Use translation functions: use __(), trans() or @lang in the view, and use __() that supports fallback; 4. Support parameters and plural: Use placeholders in translation strings such as: n

How to build a mobile app backend with Laravel How to build a mobile app backend with Laravel Sep 02, 2025 am 08:34 AM

Using Laravel to build a mobile backend requires first installing the framework and configuring the database environment; 2. Define API routes in routes/api.php and return a JSON response using the resource controller; 3. Implement API authentication through LaravelSanctum to generate tokens for mobile storage and authentication; 4. Verify file type when uploading files and store it on public disk, and create soft links for external access; 5. The production environment requires HTTPS, set current limits, configure CORS, perform API version control and optimize error handling. It is also recommended to use API resources, paging, queues and API document tools to improve maintainability and performance. Use Laravel to build a safe,

How to log messages to a file in Laravel? How to log messages to a file in Laravel? Sep 21, 2025 am 06:04 AM

LaravelusesMonologtologmessagesviatheLogfacade,withdefaultlogsstoredinstorage/logs/laravel.log.Configurechannelsinconfig/logging.phptocontroloutput;thedefaultstackchannelaggregatesmultiplehandlerslikesingle,whichwritestoafile.UseLog::info(),Log::warn

How to implement a 'remember me' functionality in Laravel How to implement a 'remember me' functionality in Laravel Aug 31, 2025 am 08:53 AM

Ensure that there is a remember_token column in the user table. Laravel's default migration already includes this field. If not, it will be added through migration; 2. Add a check box with name remember in the login form to provide the "Remember Me" option; 3. Pass the remember parameter to the Auth::attempt() method during manual authentication to enable persistent login; 4. "Remember Me" lasts for 5 years by default, and can be customized through the remember_for configuration item in config/auth.php; 5. Laravel automatically invalidates remember_token when password changes or user deletes. It is recommended to use HTTPS to ensure security in the production environment; 6

See all articles