PHP小程序支付功能完整版【基于thinkPHP】

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()  放到library\vendor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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