<?php
class Event{
    //事件名称
    public $name;
    //存储hander
    public $events = [];
    //用于绑定hander
    public function on($hander){
        $this->events[] = $hander;
    }
    //用于触发事件
    public function trigger(){
        foreach($this->events as $event){
            call_user_func($event);
        }
    }
}
function handle(){
    echo "终于下班了!\n可惜要加班!\n";
}
$event = new Event();
$event->name = '下班事件';
$event->on('handle');
$event->trigger();

$event = new Event();

$event->name = '下班事件';

$event->on('handle');

$event->trigger();