php观察者模式。

时间:2014-05-13 16:44:27   收藏:0   阅读:390

  第一次写博客,大家多多关照!欢迎拍砖哦!

  我也刚学设计模式,所以记录下来。

  

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<?php
 
class person{
    public $name;
    public $birthday;
 
    public function __set($name,$value){
        if(isset($this->$name))
        $this->$name=$value;
    }
    public function __get($name){
        if(isset($this->$name))
        return $this->$name;
    }
}
 
//观察者类实现SplSubject接口,SplSubject是php内置接口
class PersonSubject implements  SplSubject{
    public $observers,$person;
 
    public function __construct(person $person){
        $this->observers = new SplObjectStorage();
        $this->person=$person;
    }
 
    //增加一个观察者
    public function attach(SplObserver $observers){
        $this->observers->attach($observers);
    }
    //删除一个观察者
    public function detach(SplObserver $observers){
        $this->observers->detach($observers);
    }
    //达到条件时,通知观察者
    public function notify(){
        foreach($this->observers as $observer){
            $observer->update($this);
        }
    }
    //返回被观察者实例,供观察者处理
    public function getPerson(){
        return $this->person;
    }
}
 
//观察者实现SplObserver接口,SplObserver是php内置接口
class fatherObserver implements SplObserver{
    //条件达到时,执行的动作
    public function update(SplSubject $splsubject){
        $person=$splsubject->getPerson();
        echo $person->name.‘ 生日快乐,我是爸爸!‘;
    }
}
 
class motherObserver implements SplObserver{
    public function update(SplSubject $splsubject){
        $person=$splsubject->getPerson();
        echo $person->name.‘ 生日快乐,我是妈妈!‘;
    }
}
 
class sisterObserver implements SplObserver{
    public function update(SplSubject $splsubject){
        $person=$splsubject->getPerson();
        echo $person->name.‘ 生日快乐,我是姐姐!‘;
    }
}
 
 
//实例化小明
$xiaoming=new person();
$xiaoming->name=‘小明‘;
$xiaoming->birthday=‘0512‘;
 
//绑定观察者
$subject=new PersonSubject($xiaoming);
$subject->attach(new fatherObserver);
$subject->attach(new motherObserver);
$subject->attach(new sisterObserver);
 
//如果小明生日到了,通知观察者
$date=date(‘md‘,time());
if($xiaoming->birthday==$date){
    $subject->notify();
}
 
?>

输出    bubuko.com,布布扣

 

大家自己看吧,项目中我也没用到观察者模式,郁闷!

php观察者模式。,布布扣,bubuko.com

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