header("Content-type:text/html;charset=utf-8");
/**

类名：Observer

说明：观察者模式
*/
class Observer{
// 声明存放观察者容器
protected $container = array();

/*

新增观察者函数
*/
public function addObserver($type, $observer) {
$this->container[$type][] = $observer;
}

/*

运行订单观察者
*/
public function runObserver($type,$obj) {
if (isset($this->container[$type])) {
foreach ($this->container[$type] as $obser) {
$obj = new $obser();
$obj->update($obj);
}
}
}
}

/**

类名：Order说明：订单类

观察者模式的使用
*/
class Order {

/*

创建订单
*/
public function create($type,$observer) {
echo '购买成功<br/>';
$observer->runObserver($type,$this);
}
}

/*

类名：Email说明：邮件类
*/
class Email {
public static function update($order) {
echo '发送邮件<br/>';
}
}
class Status {
public static function update($order) {
echo '改变订单状态<br/>';
}
}

$type1 = 'buy';
$observer = new Observer();
$observer->addObServer($type1, 'Email');
$observer->addObServer($type1, 'Status');

$order = new Order();
$order->create($type1,$observer);

class Supply{
public function release($type,$observer){
echo "发布成功";
$observer->runObserver($type,$this);
}
}

class Sms{
public static function update($supply){
echo "推送消息";
}
}

$type2 = 'release';
$observer2 = new Observer();
$observer2->addObserver($type2,'Sms');

$supply = new Supply();
$supply->release($type2,$observer2);