每天认识一种设计模式之简单工厂模式

// 支付接口
interface Payment {
    public function pay($amount);
}

// 具体支付类
class Alipay implements Payment {
    public function pay($amount) {
        echo "支付宝支付：{$amount}元\n";
    }
}

class WechatPay implements Payment {
    public function pay($amount) {
        echo "微信支付：{$amount}元\n";
    }
}

// 简单工厂
class PaymentFactory {
    public static function createPayment($type) {
        switch ($type) {
            case 'alipay':
                return new Alipay();
            case 'wechat':
                return new WechatPay();
            default:
                throw new Exception("不支持的支付方式");
        }
    }
}

// 使用
$payment = PaymentFactory::createPayment('alipay');
$payment->pay(100); // 输出：支付宝支付：100元