小程序端 js数据处理 根据官方文档配置好参数，传入服务器。
/*** 微信支付接口*/wxPaymoney:function (out_trade_no, true_money){ //out_trade_no 后台统一下单接口需要用var that = thiswx.hideToast() //隐藏toastwx.request({method: 'POST',data: {openid: '************',//调用人的openidout_trade_no: out_trade_no,body: '答题奖金', no****rl: 'https://www.q**************.php',//后台接口自动修改订单状态t*****e: true_money//支付金额},url: 'https://b***************gn.php',//服务器接口（微信统一下单接口）header: {'Content-Type': 'application/x-www-form-urlencoded'},success: function (res) {console.log(res.data)console.log('调起支付')wx.requestPayment({//成功之后，调用小程序微信支付'timeStamp': res.data.timeStamp,'nonceStr': res.data.nonceStr,'package': res.data.package,'signType': 'MD5','paySign': res.data.paySign,success: function (res) {console.log(res)wx.showToast({title: '支付成功',icon: 'success',duration: 3000})}, fail: function (res) {console.log('付款失败');wx.showModal({title: '提醒',content: '付款失败,如要出题请重新编辑题目',showCancel: false,success:function(){wx.redirectTo({url: '/pa*******ndex',})}})return},})},fail: function (res) {console.log(res.data)}})}
服务器端 接收前端传来参数进行数据交互 （所需：appid，mch_id商户号）
<?php$appid='********';//准备数据（都在后台系统中可查到）$mch_id='12******02';//商户号$key='lk******aFK12';$openid = trim($_POST['openid']);//$out_trade_no = $mch_id.time();$out_trade_no = trim($_POST['out_trade_no']);//$body = "答题奖金";$body = $_POST['body'];//$notify_url = 'http://w***************y.php';$notify_url = trim($_POST['notify_url']);$to**ee = floatval($_POST['to****e']);$str = var_export($_POST,true);file_put_contents("set.txt",$str."\n",FILE_APPEND);$weixinpay = new WeixinPay($appid,$openid,$mch_id,$key,$out_trade_no,$body,$to****,$notify_url);$return=$weixinpay->pay();echo json_encode($return);/** 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,$notify_url) {$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 = $total_fee;$this->notify_url = $notify_url;}public function pay() {//统一下单接口$return = $this->weixinapp();return $return;}//微信小程序接口private function weixinapp() {//统一下单接口$unifiedorder = $this->unifiedorder();$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 $parameters;}//统一下单接口private function unifiedorder() {$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' => $this->body,'out_trade_no'=> $this->out_trade_no,'total_fee' => $this->t***ee,'spbill_create_ip' => '1****8', //终端IP'notify_url' => $this->notify_url, //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:$error");}}//数组转换成xmlprivate function arrayToXml($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 $val;}//作用：产生随机字符串，不长于32位private function createNoncestr($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;}}?>
