1.手动监听

<?php
declare (strict_types = 1);

namespace app\index\controller;

use think\facade\Event;

class Index
{    public function __construct(){

    Event::listen('first', function($param){
        echo $param . '+';
    });
}
    public function index()
    {
        event('first', 'first success');
        return '您好！这是一个[index]示例应用';
    }
}

2.监听器监听

<?php
/**
 * Created by PhpStorm.
 * User: Administrator
 * Date: 2021/9/18
 * Time: 14:46
 */

namespace app\index\listener;


class TestListener
{
    public function handle($event)
    {
        //
        echo "testListner监听成功";
    }

}

<?php
declare (strict_types = 1);

namespace app\index\controller;

use think\facade\Event;

class Index
{

    public function index()
    {
        Event::listen('test', 'app\index\listener\TestListener');
        event('test');

        return '您好！这是一个[index]示例应用';
    }
}

3.修改event.php文件,添加事件监听

监听器还是上面的监听器

<?php
/**
 * Created by PhpStorm.
 * User: Administrator
 * Date: 2021/9/18
 * Time: 14:46
 */

namespace app\index\listener;


class TestListener
{
    public function handle($event)
    {
        //
        echo "testListner监听成功";
    }

}

修改event.php

<?php
// 这是系统自动生成的event定义文件
return [
    'listen'    => [
        'test' => ['app\index\listener\TestListener']
    ]

];

修改调用的代码

<?php
declare (strict_types = 1);

namespace app\index\controller;

use think\facade\Event;

class Index
{

    public function index()
    {
        event('test');

        return '您好！这是一个[index]示例应用';
    }
}

4.事件订阅

添加订阅类

<?php
/**
 * Created by PhpStorm.
 * User: Administrator
 * Date: 2021/9/18
 * Time: 15:00
 */

namespace app\index\subscribe;


class TestSub
{
    public function onTestSub1(){
        echo "testSub1";
    }

    public function onTestSub2(){
        echo "testSub2";
    }

}

修改event.php，绑定订阅类

<?php
// 这是系统自动生成的event定义文件
return [
    'listen'    => [
        'test' => ['app\index\listener\TestListener']
    ],
    'subscribe' => [
        'app\index\subscribe\TestSub'
    ],
];

调用订阅的方法

<?php
declare (strict_types = 1);

namespace app\index\controller;

use think\facade\Event;

class Index
{

    public function index()
    {
        event('test');
        event('TestSub1');
        event('TestSub2');
        return '您好！这是一个[index]示例应用';
    }
}

效果如下