<?php/** * 观察者模式 * @author: Mac * @date: 2012/02/22 */class Paper{ /* 主题 */ private $_observers = array(); public function register($sub){ /* 注册观察者 */ $this->_observers[] = $sub; } public function trigger(){ /* 外部统一访问 */ if(!empty($this->_observers)){ foreach($this->_observers as $observer){ $observer->update(); } } }}/** * 观察者要实现的接口 */interface Observerable{ public function update();}class Subscriber implements Observerable{ public function update(){ echo "Callback\n"; }} |
下面是测试代码
/* 测试 */$paper = new Paper();$paper->register(new Subscriber());//$paper->register(new Subscriber1());//$paper->register(new Subscriber2());$paper->trigger(); |
原文：http://www.cnblogs.com/phpxuetang/p/5586248.html