php实现小程序支付完整版

php实现小程序支付的具体代码，具体内容如下

环境： tp3.2  + 小程序 微信支付功能开通

Step1:  下载PHP 支付SDK(下载地址)  放到LibraryVendor下，取名Wxpay

修改WxPay.Config.php 里的appid appsecret key MCHID

Step2: 小程序 js 代码：

   var url = getApp().globalData.httpServer + 'api/buy/pay';      var userId = getApp().globalData.userId;      var totalMoney = this.data.totalMoney;      var cart = this.data.goods;      var param = {        cart: JSON.stringify(cart),        cartamount: totalMoney,        userid: userId,        payment: this.data.payment,        addressid: defaultAddress.id      };      var that = this;      util.http(url, param, function (ret) {        if (ret.data.code == 1) {          if (that.data.payment == 'balance') { // 余额支付            that.afterPaySuccess(ret.data.data);          } else {                // 微信支付            wx.requestPayment({              timeStamp: ret.data.data.timeStamp,              nonceStr: ret.data.data.nonceStr,              package: ret.data.data.package,              signType: ret.data.data.signType,              paySign: ret.data.data.paySign,              'success': function (res) {                that.afterPaySuccess(ret.data.data.orderid);              },              'fail': function (res) {                console.log(res);              }            })                          }           } else {          util.showTip(ret.data.msg, '提交订单失败');                }      });

  /**   * 网络请求   */  function http(url, params, callback) {    wx.request({      url: url,      data: params,      success: function (res) {        callback(res);      },         fail: function (err) {        console.log(err);      }    });  }

Step3: 接口代码：

    public function pay()    {      $cart = I('cart', '', 'trim');      $cartAmount = I('cartamount');      $addressId = I('addressid', 0, 'intval');      $payment = I('payment', '', 'trim');      $userId = $this->userid;         $cart = json_decode($cart, true);      if (empty($cart)) {        $result['msg'] = '购物车获取失败';        $result['code'] = 0;        $this->ajaxReturn($result);      }         $totalMoney = 0;      foreach ($cart as $goods) {        $money = $goods['price'];  // price        $selectCount = $goods['selectcount'];  // price        $itemAmount = number_format($money * $selectCount, 2, '.', '');        $totalMoney += $itemAmount;      }      // 检查总金额是否一致      if ($totalMoney != $cartAmount) {        $result['msg'] = '总金额不匹配:' . $totalMoney;        $result['code'] = 0;        $this->ajaxReturn($result);      }         // 获取用户地址      $address = M('MemberAddress')->where('userid=' . $userId . " and id=" . $addressId)->find();      if (empty($address)) {        $result['msg'] = '用户地址不存在';        $result['code'] = 0;        $this->ajaxReturn($result);      }         // 用户信息      $user = M('Member')->where("id=" . $userId)->find();      if ($payment == 'balance') {        if ($user['amount'] < $cartAmount) {          $result['msg'] = '余额不足';          $result['code'] = 0;          $this->ajaxReturn($result);        }      }         // 生成订单      $order['ordersn'] = $this->genOrdersn($user['id']);      $order['price'] = $cartAmount;      $order['addressid'] = $address['id'];      $order['addressinfo'] = serialize($address); //json_encode($address);      $order['longitude'] = $address['longitude'];      $order['latitude'] = $address['latitude'];      $order['addtime'] = time();      $order['status'] = 0;      $order['userid'] = $user['id'];      $order['paytype'] = $payment;      $order['paysn'] = '';      $order['paytime'] = time();      $orderId = M("Order")->add($order);      if ($orderId == 0) {        $result['msg'] = '创建订单失败';        $result['code'] = 0;        $this->ajaxReturn($result);      }      foreach ($cart as $goods) {        $orderGoods['orderid'] = $orderId;        $orderGoods['goodsid'] = $goods['id'];        $orderGoods['title'] = $goods['title'];        $orderGoods['price'] = $goods['price'];        $orderGoods['attr'] = $goods['attr'];        $orderGoods['pic'] = $goods['pic'];        $orderGoods['num'] = $goods['selectcount'];        M("OrderGoods")->add($orderGoods);      }         if ($payment == 'balance') {        // 余额支付        $this->balancePay($cartAmount, $user['wxopenid'], $orderId);      } else if ($payment == 'weixin') {        // 微信支付        $this->weixinPay($cartAmount, $user['wxopenid'], $orderId, $order['ordersn']);      }    }

    /**     * 微信支付     * @author 大脸猫脸大     * @param $cart     * @param $cartAmount     * @param $address     * @param $user     */    private function weixinPay($cartAmount, $openId, $orderId, $orderSn)    {         import("Vendor.Wxpay.lib.WxPay#Api", "", ".php");      //订单号      $money = $cartAmount * 100;      $openid = $openId;      $input = new WxPayUnifiedOrder();      $input->SetBody("迪克-商品");      $input->SetOut_trade_no("$orderSn");      $input->SetTotal_fee("$money");      $input->SetNotify_url("https://" . $_SERVER['HTTP_HOST'] . "/api/buy/payNotify");      $input->SetTrade_type("JSAPI");      $input->SetOpenid($openid);      $unifiedOrder = WxPayApi::unifiedOrder($input);         if ($unifiedOrder['result_code'] == 'SUCCESS' && $unifiedOrder['return_code'] == 'SUCCESS') {        $time = time();        $data['timeStamp'] = "$time";              //时间戳        $data['nonceStr'] = $unifiedOrder['nonce_str'];     //随机字符串        $data['signType'] = 'MD5';                //签名算法，暂支持 MD5        $data['package'] = 'prepay_id=' . $unifiedOrder['prepay_id'];  //统一下单接口返回的 prepay_id 参数值，提交格式如：prepay_id=*        $data['paySign'] = $this->genPaySign($unifiedOrder, $time);// 之前以为是$unifiedOrder['sign']; 后来发现是调用的这种方法. 签名方案参见微信公众号支付帮助文档;           $data['out_trade_no'] = $orderSn;         $data['orderid'] = $orderId;         $return['code'] = 1;         $return['data'] = $data;       } else {           Log::write(var_export($unifiedOrder, true), Log::ERR, '', C('LOG_PATH')."wx_pay_".date('y_m_d').'.log');           $return['code'] = 0;           $return['msg'] = '微信支付失败';// $unifiedOrder['RETURN_MSG'];       }       $this->ajaxReturn($return);   }

  /* 生成支付签名*/  private function genPaySign($unifiedOrder, $time)  {    $appId = WxPayConfig::APPID;    $nonceStr = $unifiedOrder['nonce_str'];    $package = 'prepay_id=' . $unifiedOrder['prepay_id'];    $signType = "MD5";    $timeStamp = $time;    $key = WxPayConfig::KEY;      $sign = md5(sprintf("appId=%s&nonceStr=%s&package=%s&signType=%s&timeStamp=%s&key=%s", $appId, $nonceStr, $package, $signType, $timeStamp, $key));  }

   /**     * 支付回调     * @author:大脸猫脸大     */    public function payNotify()    {      import("Vendor.Wxpay.lib.WxPay#Data", "", ".php");      $xml = $GLOBALS['HTTP_RAW_POST_DATA'];      $val = WxPayResults::Init($xml);         if ($val['result_code'] == 'SUCCESS' && $val['return_code'] == 'SUCCESS') {           $orderSn = $val['out_trade_no'];        $transactionId = $val['transaction_id'];        $data = array('paytype' => 'weixin', 'status' => '1', 'paytime' => time(), 'paysn' => $transactionId);           M("Order")->where("ordersn='$orderSn'")->setField($data);        exit('<xml><return_code><![CDATA[SUCCESS]]></return_code><return_msg><![CDATA[OK]]></return_msg></xml>');      }else {        Log::write(var_export($val, true), Log::ERR, '', C('LOG_PATH')."wx_pay_notify_".date('y_m_d').'.log');        exit('<xml><return_code><![CDATA[FAIL]]></return_code><return_msg><![CDATA[OK]]></return_msg></xml>');      }  }

payNotify 回调方法里一定要注意返回

<xml><return_code><![CDATA[SUCCESS]]></return_code><return_msg><![CDATA[OK]]></return_msg></xml>

如果不处理，你会发现payNotify  会被执行很多次参见：官方文档