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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();
}
?>
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