<?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();

}

?>