{
/**
* 观察者的名称
* @var <type>
*/
private $_name;
public function __construct($name)
{
$this->_name = $name;
}
/**
* 更新方法
*/
public function update()
{
echo 'Observer', $this->_name, ' has notified.<br />';
}
}
//实例化类：
$subject = new ConcreteSubject();
/* 添加第一个观察者 */
$observer1 = new ConcreteObserver('Martin');
$observer2 = new ConcreteObserver('phppan');
$subject->attach($observer1);
//添加第一个观察者
$subject->attach($observer2);
//添加第二个观察者
$subject->detach($observer1);
//删除第一个观察者
$subject->notifyObservers();
/**
* Main program.
*/
public static function main()
{
$subject = new ConcreteSubject();
/* 添加第一个观察者 */
$observer1 = new ConcreteObserver("Martin");
$subject->attach($observer1);
echo "\nThe First notify:\n";
$subject->notifyObservers();
/* 添加第二个观察者 */
$observer2 = new ConcreteObserver("phppan");
$subject->attach($observer2);
echo "\nThe Second notify:\n";
$subject->notifyObservers();
/* 删除第一个观察者 */
$subject->detach($observer1);
echo "\nThe Third notify:\n";
$subject->notifyObservers();
}
