laravel学习笔记（六）：事件订阅者_laravel event subscriber-优快云博客

本文链接：https://blog.youkuaiyun.com/qq_34739614/article/details/107131967

本文解析了事件监听者与事件订阅者在Laravel框架中的使用差异，通过实例展示了如何创建事件、事件监听者及事件订阅者，并注册它们。文章强调了一个监听者只能监听一个事件，而事件订阅者可以监听多个事件。

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一、事件监听者与事件订阅者的区别

其实就一句话：
Each event can have multiple listeners, but a listener can’t listen to more than a single event. If you want a class listening to many events, you should use the Event Subscribers.
每个事件均可有多个监听器，但是一个监听器只能监听一个事件。如果想在一个类中监听多个事件，就需要适用事件订阅者。

二、.具体示例

1.创建事件Test1、Test2
文件目录 app/Events/Test1.php、app/Events/Test2.php

php artisan make:event Test1
php artisan make:event Test1

2.创建事件订阅者
文件目录 app/Listeners/TestEventSubscribe.php

<?php


namespace App\Listeners;


use Illuminate\Support\Facades\Log;

class TestEventSubscribe
{
    /**
     * 处理Test1事件
     *
     * @param $event
     */
    public function handleTestDoSomething1($event)
    {
        Log::info('TestEventSubscribe handleTestDoSomething1');
    }

    /**
     * 处理Test2事件
     *
     * @param $event
     */
    public function handleTestDoSomething2($event)
    {
        Log::info('TestEventSubscribe handleTestDoSomething1');
    }

    /**
     * 为事件订阅者注册事件监听器
     *
     * @param $event
     */
    public function subscribe($event)
    {
        $event->listen(
            'App\Events\Test1',
            'App\Listeners\TestEventSubscribe@handleTestDoSomething1'
        );

        $event->listen(
            'App\Events\Test2',
            'App\Listeners\TestEventSubscribe@handleTestDoSomething2'
        );
    }
}

3.注册事件订阅者
文件目录 app/Providers/EventServiceProvider.php

protected $subscribe = [
    'App\Listeners\TestEventSubscribe'
];

4.创建控制器
php artisan make:controller TestController
文件目录 app/Http/Controllers/TestController.php

<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;
use Illuminate\Support\Facades\Log;
use App\Events\Test1;
use App\Events\Test2;

class TestController extends Controller
{
    /**
     * 触发事件Test1
     */
    public function test1()
    {
        Log::info('TestContoller@test1');
        event(new Test1());
    }

    /**
     * 触发事件Test2
     */
    public function test2()
    {
        Log::info('TestContoller@test2');
        event(new Test2());
    }

    /**
     * 触发事件Test1、Test2
     */
    public function test()
    {
        Log::info('TestContoller@test');
        event(new Test1());
        event(new Test2());
    }
}

5.创建路由
文件目录 routes/web.php

Route::get('/test1', 'TestController@test1');
Route::get('/test2', 'TestController@test2');
Route::get('/test', 'TestController@test');

6.在浏览器访问，并查看日志文件