策略模式

策略模式

<?php
//策略模式
interface OrderPayInterface
{
    public function PayEvent($OrderId = null);
}

class OrderPay implements OrderPayInterface
{
    public function PayEvent($OrderId = null)
    {
        echo "订单ID为:{$OrderId}的订单状态为已支付" . PHP_EOL;
    }
}

abstract class OrderEventAbstract
{
    private $Observer;

    public function register(OrderPayInterface $pay)
    {
        $this->Observer = $pay;
    }

    public function notify($OrderId)
    {
        $this->Observer->PayEvent($OrderId);
    }
}

class Order extends OrderEventAbstract
{
    public function pay($OrderId)
    {
        echo "支付成功" . PHP_EOL;
        $this->notify($OrderId);
    }
}

$order = new Order();
$order->register(new OrderPay());
$order->pay(1);