PHP实现微信小程序支付完整版，可以借鉴！

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);
    }
  });
}

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>'); } }

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