PHP小程序支付功能完整版【基于thinkPHP】分享！

本文实例讲述了PHP小程序支付功能。分享给大家供大家参考，具体如下：

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));      return $sign;  }  /**  * 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

总结一下： 注意二点， 1.签名的问题 2. 回调方法的返回处理。

欢迎大家指正。

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