thinkphp5.0 Loader::import引入extend第三方类库，APP支付宝服务端支付为例

<?php
require_once 'AopEncrypt.php';
require_once 'EncryptParseItem.php';
require_once 'EncryptResponseData.php';
require_once 'SignData.php';
 
class AopClient
{
 
}

    public function test(){
    	Loader::import('alipay.AopClient');
        Loader::import('alipay.request.AlipayTradeAppPayRequest');
    	$aop = new \AopClient();
        $aop->gatewayUrl = "https://openapi.alipay.com/gateway.do";
        $aop->appId = "app_id";
        $aop->rsaPrivateKey = '支付宝私钥';
        $aop->format = "json";
        $aop->charset = "UTF-8";
        $aop->signType = "RSA2";
        $aop->alipayrsaPublicKey = '支付宝应用公钥';
        //实例化具体API对应的request类,类名称和接口名称对应,当前调用接口名称：alipay.trade.app.pay
        $request = new \AlipayTradeAppPayRequest();
        //var_dump($request);
        //SDK已经封装掉了公共参数，这里只需要传入业务参数
        $bizcontent = "{\"body\":\"我是测试数据\","
            . "\"subject\": \"App支付测试\","
            . "\"out_trade_no\": \"20170125test01\","
            . "\"timeout_express\": \"30m\","
            . "\"total_amount\": \"0.01\","
            . "\"product_code\":\"QUICK_MSECURITY_PAY\""
            . "}";
        $request->setNotifyUrl("商户外网可以访问的异步地址");
        $request->setBizContent($bizcontent);
//这里和普通的接口调用不同，使用的是sdkExecute
        $response = $aop->sdkExecute($request);
//htmlspecialchars是为了输出到页面时防止被浏览器将关键参数html转义，实际打印到日志以及http传输不会有这个问题
        echo htmlspecialchars($response);//就是orderString 可以直接给客户端请求，无需再做处理。
    }