PHP100 2019-03-27
代码如下:
<?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();