PHP 观察者模式的解决办法

这篇文章主要为大家详细介绍了PHP 观察者模式的简单示例，具有一定的参考价值，可以用来参考一下。

<?php
/**
 * PHP观察者模式
 *
 * @param 
 * @author php教程 www.idcnote.com
 **/
interface Message {
   static function getType();
};
interface Observer {
   function notifyMsg(Message $msg);
};
class Subject {
   private $observers = Array();
   public function registerObserver(Observer $observer, $msgType) {
    $this->observers[$msgType][] = $observer;   // wyh?
   }
   private function notifyMsg(Message $msg) {
    @$observers = $this->observers[$msg->getType()];
    if (!$observers) {
     return;
    }
    foreach ($observers as $observer) {
     $observer->notifyMsg($msg);
    }
   }
   public function someMethod() {
           sleep(1);
          $this->notifyMsg(new HelloMessage("Michael"));
        }
}
class HelloMessage implements Message {
   private $name;
   public function __construct($name) {
    $this->name = $name;
   }
   public function getMsg() {
    return "Hello,$this->name!";
   }
   static function getType() {
    return "HELLO_TYPE";
   }
}
class SubObserver implements Observer {
   public function notifyMsg(Message $msg) {
    if ($msg instanceof HelloMessage) {
     echo $msg->getMsg();
    }
   }
}
$subject = new Subject();
    $observer = new SubObserver();
    $subject->registerObserver($observer, HelloMessage::getType());
    $subject->someMethod();
?>


/***   来自php教程（www.idcnote.com）   ***/

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