Laravel事件Event

适用场景：记录文章浏览量

php artisan make:event 事件名

示例：

php artisan make:event MyEvent

Laravel目录\app\Events已经生成MyEvent.php文件

<?php

namespace App\Events;

use App\Events\Event;
use Illuminate\Queue\SerializesModels;
use Illuminate\Contracts\Broadcasting\ShouldBroadcast;

class MyEvent 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 [];
    }
}

事件必须有监听者，我们先在\app\Providers目录下找到EventServiceProvider.php文件，该文件内有一个Events-Listeners数组来保存事件和监听者的映射关系。

protected $listen = [
	'App\Events\MyEvent' => [
		'App\Listeners\MyListener1',
		'App\Listeners\MyListener2'
	]
];

这里，我们让一个事件有两个监听者，使用artisan控制台自动生成php文件

php artisan event:generate

Laravel\app\Listeners目录下已经生成了MyListener1.php和MyListener2.php

问题来了，我们怎么触发这个事件？

这里借用我们上一篇博客说的Console，来测试这个事件，如果你对Console不熟，可以看http://www.cnblogs.com/sweng/p/6358919.html

对Check类中修改handle()函数，使用Event::fire(new MyEvent())触发事件，实际上是传入一个Event对象

<?php

namespace App\Console\Commands;

use Illuminate\Console\Command;

//
use Illuminate\Support\Facades\Event;
use App\Events\MyEvent;

class Check extends Command
{
    /**
     * The name and signature of the console command.
     *
     * @var string
     */
    protected $signature = 'check';

    /**
     * The console command description.
     *
     * @var string
     */
    protected $description = 'Command description';

    /**
     * Create a new command instance.
     *
     * @return void
     */
    public function __construct()
    {
        parent::__construct();
    }

    /**
     * Execute the console command.
     *
     * @return mixed
     */
    public function handle()
    {
        //
		echo 'checking...';
		Event::fire(new MyEvent());
    }
}