php设计模式--装饰模式

//手机套餐费用接口
abstract class IPhonePackpageFee
{
      protected abstract function SpendFee();
      public $Fee;
}

//基础消费
class  MonthFee extends IPhonePackpageFee
{
    public function __construct($fee)
    {
        $this->Fee=$fee;
    }
    public function SpendFee ()
    {
        echo("基础套餐费用:".$this->Fee);
        echo ("<hr/>");
    }
}

//装饰类
class DecoratorService extends IPhonePackpageFee
{
       private  $exFee;
       function __construct(IPhonePackpageFee $exfee)
    {
        $this->exFee=$exfee;
    }
    public  function SpendFee()
    {
        $this->exFee->SpendFee();
    }

}

class  MobileFlow extends  DecoratorService
{
    function __construct(DecoratorService $exService,$fee)
    {
        parent::__construct($exService);
        $this->Fee=$fee;
    }

    public function SpendFee()
    {
        $this->SpendFlow();
        parent::SpendFee();
    }
    private function SpendFlow()
    {
        echo ("流量费用：".$this->Fee);
        echo ("<br/>");
    }
}

echo("php装饰模式：");
        echo ("<hr/>");
        $monthfee=new MonthFee(30);
        $decorator=new DecoratorService($monthfee);
        $flow=new MobileFlow($decorator,12);
        $flow->SpendFee();