最近开发小程序，一直在看小程序的支付。经过一天的努力，小程序支付功能最终实现了。
下面感谢 csdn 博主：千堆雪惹尘埃 发布的 " 小程序与php 实现微信支付 "
原文地址：
http://blog.csdn.net/admin1008611/article/details/73240458
下面是我自己写的代码：使用的 thinkphp：其他的可以参考修改：
服务端：
获取用户的 openid：
public function get_openid(){ $data = array(); $url = "https://api.weixin.qq.com/sns/jscode2session"; $data[‘appid‘] = I(‘get.appid‘,‘‘,‘trim‘); // 小程序的app_id $data[‘secret‘] = I(‘get.secret‘,‘‘,‘trim‘); //小程序的 app_secret $data[‘js_code‘] = I(‘get.js_code‘,‘‘,‘trim‘); $data[‘grant_type‘] = "authorization_code"; $res = $this->http_request($url,$data); echo $res; }
支付接口：
public function wxPay(){ $openID = I(‘get.openid‘,‘‘,‘trim‘); $totalFee = I(‘get.total_fee‘,‘‘,‘trim‘); $title = I(‘get.title‘,‘‘,‘trim‘); // 具体配置 $appid = "填写小程序的 appid"; //小程序 appid $openid = $openID; // 用户的openid $mch_id = "填写商户号"; //商户号 $key = "填写商户号的秘钥"; $out_trade_no = $this->order_number();//商户订单号 $body = $title; $total_fee = $totalFee;//总金额 单位 分 $weixinpay = new \Components\WeixinPay($appid,$openid,$mch_id,$key,$out_trade_no,$body,$total_fee); $result = $weixinpay->pay(); echo json_encode($result); }
生成随机字符串和订单号：
//随机32位字符串 private function nonce_str(){ $result = ‘‘; $str = ‘QWERTYUIOPASDFGHJKLZXVBNMqwertyuioplkjhgfdsamnbvcxz‘; for ($i=0;$i<32;$i++){ $result .= $str[rand(0,48)]; } return $result; } //生成订单号 private function order_number($openid){ //date(‘Ymd‘,time()).time().rand(10,99);//18位 return md5($openid.time().rand(10,99));//32位 }
支付回调接口：
// 支付回调地址 public function notify(){ $postXml = $GLOBALS["HTTP_RAW_POST_DATA"]; //接收微信参数 if (empty($postXml)) { return false; } //将xml格式转换成数组 function xmlToArray($xml) { //禁止引用外部xml实体 libxml_disable_entity_loader(true); $xmlstring = simplexml_load_string($xml, ‘SimpleXMLElement‘, LIBXML_NOCDATA); $val = json_decode(json_encode($xmlstring), true); return $val; } $attr = xmlToArray($postXml); $total_fee = $attr[total_fee]; $open_id = $attr[openid]; $out_trade_no = $attr[out_trade_no]; $time = $attr[time_end]; }
小程序JS：
//index.js //获取应用实例 const app = getApp() const APP_ID = "小程序的appid";//输入小程序的appid const APP_SECRET = "小程序的app_secret";//输入小程序app_secret var OPEN_ID = "";//储存获取到openid var SESSION_KEY = "";//储存获取到session_key Page({ data:{ ‘message‘:"发起支付" }, wxPay:function(){ var that = this; wx.login({ success:function(res){ wx.request({ url:"https://xiaochengxu.e0yu.com/index.php?s=Index/get_openid", data:{ appid: APP_ID, secret:APP_SECRET, js_code:res.code, grant_type: ‘authorization_code‘ }, method:‘GET‘, success:function(res){ //console.log(res); OPEN_ID = res.data.openid;//获取到的openid wx.request({ url: "https://xiaochengxu.e0yu.com/index.php?s=Index/wxPay", data:{ openid:OPEN_ID, total_fee:1,//充值金额 单位"分" title:‘商品标题‘ }, method:‘GET‘, success:function(result){ //console.log(result); console.log(‘调起支付‘); wx.requestPayment({ ‘timeStamp‘: result.data.timeStamp, ‘nonceStr‘: result.data.nonceStr, ‘package‘: result.data.package, ‘signType‘: ‘MD5‘, ‘paySign‘: result.data.paySign, ‘success‘: function (res) { console.log(‘success‘); }, ‘fail‘: function (res) { console.log(‘fail‘); }, ‘complete‘: function (res) { console.log(‘complete‘); } }); } }) }, }) } }); } })
效果 ：
下面给出：WeixinPay：
<?php namespace Components; /* 小程序微信支付 */ class WeixinPay { protected $appid; protected $mch_id; protected $key; protected $openid; protected $out_trade_no; protected $body; protected $total_fee; function __construct($appid, $openid, $mch_id, $key,$out_trade_no,$body,$total_fee) { $this->appid = $appid; $this->openid = $openid; $this->mch_id = $mch_id; $this->key = $key; $this->out_trade_no = $out_trade_no; $this->body = $body; $this->total_fee = $total_fee; } public function pay() { //统一下单接口 $return = $this->weixinapp(); return $return; } //统一下单接口 private function unifiedorder() { $url = ‘https://api.mch.weixin.qq.com/pay/unifiedorder‘; $parameters = array( ‘appid‘ => $this->appid, //小程序ID ‘mch_id‘ => $this->mch_id, //商户号 ‘nonce_str‘ => $this->createNoncestr(), //随机字符串 // ‘body‘ => ‘test‘, //商品描述 ‘body‘ => $this->body, // ‘out_trade_no‘ => ‘2015450806125348‘, //商户订单号 ‘out_trade_no‘=> $this->out_trade_no, // ‘total_fee‘ => floatval(0.01 * 100), //总金额 单位 分 ‘total_fee‘ => $this->total_fee, // ‘spbill_create_ip‘ => $_SERVER[‘REMOTE_ADDR‘], //终端IP ‘spbill_create_ip‘ => ‘192.168.0.161‘, //终端IP ‘notify_url‘ => ‘http://www.weixin.qq.com/wxpay/pay.php‘, //通知地址 确保外网能正常访问 ‘openid‘ => $this->openid, //用户id ‘trade_type‘ => ‘JSAPI‘//交易类型 ); //统一下单签名 $parameters[‘sign‘] = $this->getSign($parameters); $xmlData = $this->arrayToXml($parameters); $return = $this->xmlToArray($this->postXmlCurl($xmlData, $url, 60)); return $return; } private static function postXmlCurl($xml, $url, $second = 30) { $ch = curl_init(); //设置超时 curl_setopt($ch, CURLOPT_TIMEOUT, $second); curl_setopt($ch, CURLOPT_URL, $url); curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE); curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, FALSE); //严格校验 //设置header curl_setopt($ch, CURLOPT_HEADER, FALSE); //要求结果为字符串且输出到屏幕上 curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE); //post提交方式 curl_setopt($ch, CURLOPT_POST, TRUE); curl_setopt($ch, CURLOPT_POSTFIELDS, $xml); curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 20); curl_setopt($ch, CURLOPT_TIMEOUT, 40); set_time_limit(0); //运行curl $data = curl_exec($ch); //返回结果 if ($data) { curl_close($ch); return $data; } else { $error = curl_errno($ch); curl_close($ch); throw new WxPayException("curl出错，错误码:$error"); } } //数组转换成xml private function arrayToXml($arr) { $xml = "<root>"; foreach ($arr as $key => $val) { if (is_array($val)) { $xml .= "<" . $key . ">" . arrayToXml($val) . "</" . $key . ">"; } else { $xml .= "<" . $key . ">" . $val . "</" . $key . ">"; } } $xml .= "</root>"; return $xml; } //xml转换成数组 private function xmlToArray($xml) { //禁止引用外部xml实体 libxml_disable_entity_loader(true); $xmlstring = simplexml_load_string($xml, ‘SimpleXMLElement‘, LIBXML_NOCDATA); $val = json_decode(json_encode($xmlstring), true); return $val; } //微信小程序接口 private function weixinapp() { //统一下单接口 $unifiedorder = $this->unifiedorder(); // print_r($unifiedorder); $parameters = array( ‘appId‘ => $this->appid, //小程序ID ‘timeStamp‘ => ‘‘ . time() . ‘‘, //时间戳 ‘nonceStr‘ => $this->createNoncestr(), //随机串 ‘package‘ => ‘prepay_id=‘ . $unifiedorder[‘prepay_id‘], //数据包 ‘signType‘ => ‘MD5‘//签名方式 ); //签名 $parameters[‘paySign‘] = $this->getSign($parameters); return $parameters; } //作用：产生随机字符串，不长于32位 private function createNoncestr($length = 32) { $chars = "abcdefghijklmnopqrstuvwxyz0123456789"; $str = ""; for ($i = 0; $i < $length; $i++) { $str .= substr($chars, mt_rand(0, strlen($chars) - 1), 1); } return $str; } //作用：生成签名 private function getSign($Obj) { foreach ($Obj as $k => $v) { $Parameters[$k] = $v; } //签名步骤一：按字典序排序参数 ksort($Parameters); $String = $this->formatBizQueryParaMap($Parameters, false); //签名步骤二：在string后加入KEY $String = $String . "&key=" . $this->key; //签名步骤三：MD5加密 $String = md5($String); //签名步骤四：所有字符转为大写 $result_ = strtoupper($String); return $result_; } ///作用：格式化参数，签名过程需要使用 private function formatBizQueryParaMap($paraMap, $urlencode) { $buff = ""; ksort($paraMap); foreach ($paraMap as $k => $v) { if ($urlencode) { $v = urlencode($v); } $buff .= $k . "=" . $v . "&"; } $reqPar; if (strlen($buff) > 0) { $reqPar = substr($buff, 0, strlen($buff) - 1); } return $reqPar; } }
