interface Subject
{
public function Attach($Observer); //添加觀察者
public function Detach($Observer); //踢出觀察者
public function Notify(); //滿足條件時通知觀察者
public function SubjectState($Subject); //觀察條件
}
class Boss Implements Subject
{
public $_action;
private $_Observer;
public function Attach($Observer)
{
$this->_Observer[] = $Observer;
}
public function Detach($Observer)
{
$ObserverKey = array_search($Observer, $this->_Observer);
if($ObserverKey !== false)
{
unset($this->_Observer[$ObserverKey]);
}
}
public function Notify()
{
foreach($this->_Observer as $value )
{
$value->Update();
}
}
public function SubjectState($Subject)
{
$this->_action = $Subject;
}
}
abstract class Observer
{
protected $_UserName;
protected $_Sub;
public function __construct($Name,$Sub)
{
$this->_UserName = $Name;
$this->_Sub = $Sub;
}
public abstract function Update(); //接收通過方法
}
class StockObserver extends Observer
{
public function __construct($name,$sub)
{
parent::__construct($name,$sub);
}
public function Update()
{
echo $this->_Sub->_action.$this->_UserName." 你趕快跑...";
}
}
$huhansan = new Boss(); //被觀察者
$gongshil = new StockObserver("三毛",$huhansan); //初始化觀察者
$huhansan->Attach($gongshil); //添加一個觀察者
$huhansan->Attach($gongshil); //添加一個相同的觀察者
$huhansan->Detach($gongshil); //踢出基中一個觀察者
$huhansan->SubjectState("警察來了"); //達(dá)到滿足的條件
$huhansan->Notify(); //通過所有有效的觀察者