interface的使用和说明.php

 discount;
	}
	function getUserType(){
		return "VIP用户";
	}
}
//商品类
class Goods{
    var $price = 100;
    var $vc;
    //定义 User 接口类型参数，这时并不知道是什么用户
    function run($vc){
        $this->vc = $vc;
        $discount = $this->vc->getDiscount();
		$usertype = $this->vc->getUserType();
        echo $usertype."商品价格：".$this->price*$discount;
    }
}


//调用案例
$Goods = new Goods();
$Goods->run(new VipUser);	
?>