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：
/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(); $url = "https://api./sns/jscode2session";$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appidconst 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:"/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: "/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：
<?phpnamespace 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./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' => '450806125348', //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./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($ch, CURLOPT_SSL_VERIFYHOST, FALSE); //严格校验//设置headercurl_setopt($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;}}
作者：帅到要去报警链接：微信小程序 --- 完成小程序支付功能
著作权归作者所有。商业转载请联系作者获得授权，非商业转载请注明出处。
