<?php
header("Content-Type: text/html;charset=utf-8");
class test implements SplSubject{//被观察者类
 
    public $_observer;
    public $num;
    public $ad;
    function __construct()
    {
        $this->_observer = new SplObjectStorage();
    }
    public function run(){
        $this->notify();
        print_r($this);
    }
    public function attach(SplObserver $observer)
    {
        // TODO: 添加观察者对象
        $this->_observer->attach($observer);
    }
    public function detach(SplObserver $observer)
    {
        // TODO: Implement detach() method.
        $this->_observer->detach($observer);
    }
    public function notify()
    {
        // TODO: Implement notify() method.
        foreach ($this->_observer as $obj){
            $obj->update($this);
        }
    }
}
class checkNum implements SplObserver{
    public function update(SplSubject $subject)
    {
        // TODO: 根据通知更新
        $subject->num = "检查次数";
    }
}
class checkAd implements SplObserver{
    public function update(SplSubject $subject)
    {
        // TODO: 根据通知更新
        $subject->ad = "检查广告";
    }
}
$test = new test();
$test->attach(new checkNum());
$test->attach(new checkAd());
$test->run();