php开发lamp

<?php
/**
 * 策略模式Strategy（对象行为型）
 */

//　抽象策略类
interface  OrderStrategy
{

    /**
     * 计算订单实付金额
     * @param $total_price
     * @return mixed
     */
    public function actualPay($total_price);

}

//　　初级会员折扣 具体策略类
class PrimaryMemberStrategy implements  OrderStrategy
{
    public function actualPay($total_price)
    {
        echo '对于初级会员的没有折扣:0', '支付价格:',$total_price,'<br/>';
    }
}

//   中级会员折扣
class IntermediateMemberStrategy implements  OrderStrategy
{
    public function actualPay($total_price)
    {
        echo '对于中级会员的折扣为:10%','支付价格:',$total_price-($total_price*0.1),'<br/>';
    }
}
//   高级会员折扣
class AdvancedMemberStrategy implements  OrderStrategy
{
    public function actualPay($total_price)
    {
        echo '对于高级会员的折扣为:20%','支付价格:', $total_price-($total_price*0.2),'<br/>';
    }
}


//环境角色类
class Order{
    private  $price_strategy = null;

    public function __construct($price_strategy)
    {
        $this->price_strategy = $price_strategy;
    }


    /**
     * 计算实付价格
     */
    public function actualPay($total_price){
        $this->price_strategy->actualPay($total_price);
    }

    /**
     * 实际支付策略
     */
    public function setActualPayStrategy($travel){
        $this->price_strategy = $travel;
    }
}


//客户端
//中级会员计算策略
$strategy1 = new IntermediateMemberStrategy();
$order = new Order($strategy1);
$order->actualPay(100);

//高级会员计算策略
$strategy2 = new AdvancedMemberStrategy();
$order->setActualPayStrategy($strategy2);
$order->actualPay(100);