php实现小程序支付完整版

本文实例为大家分享了php实现小程序支付的具体代码，供大家参考，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复制代码 代码如下:<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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