1.跳轉後臺

mui.openWindow({
                url: "後臺網址PayH5.php?payMoney=" + n + "&buyContent=" + buyContent + "&uid=" + uid,
                waiting: {
                    autoShow: true, //自動顯示等待框，預設為true
                    title: '正在載入支付頁面......', //等待對話方塊上顯示的提示內容
                }

            })
 

2.配置引數 統一下單 

• <?php
  
  require_once ("wechatAppPay.class.php");
  
  
  //以下引數是微信公眾號引數，登入微信公眾平臺和商戶平臺就可以拿到
  //微信公眾號需要設定網頁授權域名，新增支付目錄，業務域名，js安全域名
  define('APPID','公眾號的appid');
  define('APIKEY','公眾號的apikey');
  define('MCH_ID','商戶號');
  define('NOTIFY_URL','回撥地址');
  
  
  
  //生成隨機字串
  function getNonceNum($numLen=16){
      $chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
      $str = "";
      for ($i = 0; $i < $numLen; $i++) {
          $str .= substr($chars, mt_rand(0, strlen($chars) - 1), 1);
      }
      return $str;
  }
  function getOrderId()
  {
      //日期:10位 timestamp
      $datetime = time();
      //隨機數
      $newnum = getNonceNums();
      return $datetime . $newnum;
  }
  //生成隨機數字
  function getNonceNums($numLen=4){
      $chars = "0123456789";
      $str = "";
      for ($i = 0; $i < $numLen; $i++) {
          $str .= substr($chars, mt_rand(0, strlen($chars) - 1), 1);
      }
      return $str;
  }
  
  //獲取使用者ip地址
  function getClientIp(){
      if(getenv('HTTP_CLIENT_IP') && strcasecmp(getenv('HTTP_CLIENT_IP'), 'unknown')) {
          $ip = getenv('HTTP_CLIENT_IP');
      } elseif(getenv('HTTP_X_FORWARDED_FOR') && strcasecmp(getenv('HTTP_X_FORWARDED_FOR'), 'unknown')) {
          $ip = getenv('HTTP_X_FORWARDED_FOR');
      } elseif(getenv('REMOTE_ADDR') && strcasecmp(getenv('REMOTE_ADDR'), 'unknown')) {
          $ip = getenv('REMOTE_ADDR');
      } elseif(isset($_SERVER['REMOTE_ADDR']) && $_SERVER['REMOTE_ADDR'] && strcasecmp($_SERVER['REMOTE_ADDR'], 'unknown')) {
          $ip = $_SERVER['REMOTE_ADDR'];
      }
      return preg_match ( '/[\d\.]{7,15}/', $ip, $matches ) ? $matches [0] : '';
  }
  
  
  $getNonceNumstring = getNonceNum();//隨機數
  $out_trade_no =  getOrderId();//生成訂單號
  $ip = getClientIp();//取客戶端IP
  
  $payMoney = $_GET['payMoney'];
  $uid = $_GET['uid'];
  $buyContent = $_GET['buyContent'];
  
  // 連線資料庫
  $dbms = 'mysql';
  $dbName = '資料庫名';
  $user = '使用者名稱';
  $pwd = '密碼';
  $host = 'host';
  $charset = 'utf8';
  $dsn = "$dbms:host=$host;dbname=$dbName;charset=$charset";
  
  $pdo = new mysqli($host, $user, $pwd,$dbName);
  
  //if ($pdo->connect_error) {
  //    die("Connect Failed: " . $pdo->connect_error);
  //}
  //
  //echo "Connected Success!";
  
  //更新資料庫
  $sql = "INSERT INTO ldd_withdraw (id,uid,amount,paytype,type,pay_result,out_trade_no) VALUES (uuid(),'$uid', $payMoney,2,1,0,$out_trade_no)";
  if ($pdo->query($sql) === true) {
      echo "Table guests insert Successfully";
  } else {
      echo "Create Error: " . $sql . "<br>" . $pdo->error;
  }
  
  $pdo->close();
  
  //統一下單引數
  $param['appid']             = APPID;
  $param['mch_id']            = MCH_ID;
  $param['nonce_str']         = $getNonceNumstring;
  $param['body']              = $buyContent;
  $param['out_trade_no']      = $out_trade_no;
  $param['total_fee']         = 1;
  $param['spbill_create_ip']  = $ip;
  $param['notify_url']        = NOTIFY_URL;
  $param['trade_type']        = "MWEB"; //H5 支付型別
  
  
  $wechatAppPay = new wechatAppPay(APPID, MCH_ID, NOTIFY_URL, APIKEY);//例項化微信支付類物件
  
  $sign =  $wechatAppPay->MakeSign($param);//生成支付簽名
  
  
  
  $result = $wechatAppPay->unifiedOrder( $param );; // result中就是返回的各種資訊
  
  
  //如果下單成功會返回如下資訊,這裡已經轉成了陣列，按陣列的方式操作就可以了。
  
  
  $tiaozhuanurl = $result['mweb_url']."&redirect_url=https://luoluotech.com/lddClient/html/pages/wode.html";
  
  
  echo $tiaozhuanurl;
  
  
  //redirect_url 為支付成功或取消支付之後跳轉的地址
  ?>
  
  <script>
  
      window.location.href='<?php echo $tiaozhuanurl;?>'
  
  </script>
   
  

  3.框架

• 
  <?php
  
  /**
   * 微信支付伺服器端下單
   * 微信APP支付文件地址:  https://pay.weixin.qq.com/wiki/doc/api/app.php?chapter=8_6
   * 使用示例
   *  構造方法引數
   *      'appid'     =>  //填寫微信分配的公眾賬號ID
   *      'mch_id'    =>  //填寫微信支付分配的商戶號
   *      'notify_url'=>  //填寫微信支付結果回撥地址
   *      'key'       =>  //填寫微信商戶支付金鑰
   *  );
   *  統一下單方法
   *  $WechatAppPay = new wechatAppPay($options);
   *  $params['body'] = '商品描述';                   //商品描述
   *  $params['out_trade_no'] = '1217752501201407';   //自定義的訂單號，不能重複
   *  $params['total_fee'] = '100';                   //訂單金額 只能為整數 單位為分
   *  $params['trade_type'] = 'APP';                  //交易型別 JSAPI | NATIVE |APP | WAP
   *  $wechatAppPay->unifiedOrder( $params );
  新版微信支付(APP支付)沒有了服務端demo，並且老版本的php服務端demo也不能使用了，需要商戶自己開發來實現。
  仔細看了下微信支付提供的介面說明，開發起來也不是那麼複雜，完全可以把這些放到一個php中，後續方便其他專案的呼叫。
  參考了csdn的一篇文章及下載資料，先把php程式碼貼出來。
   */
  class wechatAppPay
  {
      //介面API URL字首
      const API_URL_PREFIX = 'https://api.mch.weixin.qq.com';
      //下單地址URL
      const UNIFIEDORDER_URL = "/pay/unifiedorder";
      //查詢訂單URL
      const ORDERQUERY_URL = "/pay/orderquery";
      //關閉訂單URL
      const CLOSEORDER_URL = "/pay/closeorder";
      //公眾賬號ID
      private $appid;
      //商戶號
      private $mch_id;
      //隨機字串
      private $nonce_str;
      //簽名
      private $sign;
      //商品描述
      private $body;
      //微信使用者號
      private $openid;
      //商戶訂單號
      private $out_trade_no;
      //支付總金額
      private $total_fee;
      //終端IP
      private $spbill_create_ip;
      //支付結果回撥通知地址
      private $notify_url;
      //交易型別
      private $trade_type;
      //支付金鑰
      private $key;
      //證書路徑
      private $SSLCERT_PATH;
      private $SSLKEY_PATH;
      //所有引數
      private $params = array();
      public function __construct($appid, $mch_id, $notify_url, $key)
      {
          $this->appid = $appid;
          $this->mch_id = $mch_id;
          $this->notify_url = $notify_url;
          $this->key = $key;
      }
      /**
       * 下單方法
       * @param   $params 下單引數
       */
      public function unifiedOrder( $params ){
          $this->body = $params['body'];
          $this->out_trade_no = $params['out_trade_no'];
          $this->total_fee = $params['total_fee'];
          $this->trade_type = $params['trade_type'];
          $this->nonce_str = $this->genRandomString();
          $this->spbill_create_ip = $params['spbill_create_ip'];
  //            $this->openid =  $params['openid'];
          $this->params['appid'] = $this->appid;
          $this->params['mch_id'] = $this->mch_id;
          $this->params['nonce_str'] = $this->nonce_str;
          $this->params['body'] = $this->body;
          $this->params['out_trade_no'] = $this->out_trade_no;
          $this->params['total_fee'] = $this->total_fee;
          $this->params['spbill_create_ip'] = $this->spbill_create_ip;
          $this->params['notify_url'] = $this->notify_url;
          $this->params['trade_type'] = $this->trade_type;
          //獲取簽名資料
          $this->sign = $this->MakeSign( $this->params );
          $this->params['sign'] = $this->sign;
  
          $xml = $this->data_to_xml($this->params);
          $myfile = fopen("xml.txt", "a") or die("Unable to open file!");
          fwrite($myfile, date('Y-m-d H:i:s').'\r\n'.$xml."\r\n");
          fclose($myfile);
  
          $response = $this->postXmlCurl($xml, self::API_URL_PREFIX.self::UNIFIEDORDER_URL);
          if( !$response ){
              return false;
          }
          $result = $this->xml_to_data( $response );
  
          $myfile = fopen("xml.txt", "a") or die("Unable to open file!");
          fwrite($myfile, date('Y-m-d H:i:s').'\r\n'.$response."\r\n");
          fclose($myfile);
          if( !empty($result['result_code']) && !empty($result['err_code']) ){
              $result['err_msg'] = $this->error_code( $result['err_code'] );
          }
          return $result;
      }
      /**
       * 查詢訂單資訊
       * @param $out_trade_no     訂單號
       * @return array
       */
      public function orderQuery( $out_trade_no ){
          $this->params['appid'] = $this->appid;
          $this->params['mch_id'] = $this->mch_id;
          $this->params['nonce_str'] = $this->genRandomString();
          $this->params['out_trade_no'] = $out_trade_no;
          //獲取簽名資料
          $this->sign = $this->MakeSign( $this->params );
          $this->params['sign'] = $this->sign;
          $xml = $this->data_to_xml($this->params);
          $response = $this->postXmlCurl($xml, self::API_URL_PREFIX.self::ORDERQUERY_URL);
          if( !$response ){
              return false;
          }
          $result = $this->xml_to_data( $response );
          if( !empty($result['result_code']) && !empty($result['err_code']) ){
              $result['err_msg'] = $this->error_code( $result['err_code'] );
          }
          return $result;
      }
      /**
       * 關閉訂單
       * @param $out_trade_no     訂單號
       * @return array
       */
      public function closeOrder( $out_trade_no ){
          $this->params['appid'] = $this->appid;
          $this->params['mch_id'] = $this->mch_id;
          $this->params['nonce_str'] = $this->genRandomString();
          $this->params['out_trade_no'] = $out_trade_no;
          //獲取簽名資料
          $this->sign = $this->MakeSign( $this->params );
          $this->params['sign'] = $this->sign;
          $xml = $this->data_to_xml($this->params);
          $response = $this->postXmlCurl($xml, self::API_URL_PREFIX.self::CLOSEORDER_URL);
          if( !$response ){
              return false;
          }
          $result = $this->xml_to_data( $response );
          return $result;
      }
      /**
       *
       * 獲取支付結果通知資料
       * return array
       */
      public function getNotifyData(){
          //獲取通知的資料
          $xml = $GLOBALS['HTTP_RAW_POST_DATA'];
          $data = array();
          if( empty($xml) ){
              return false;
          }
          $data = $this->xml_to_data( $xml );
          if( !empty($data['return_code']) ){
              if( $data['return_code'] == 'FAIL' ){
                  return false;
              }
          }
          return $data;
      }
      /**
       * 接收通知成功後應答輸出XML資料
       * @param string $xml
       */
      public function replyNotify(){
          $data['return_code'] = 'SUCCESS';
          $data['return_msg'] = 'OK';
          $xml = $this->data_to_xml( $data );
          echo $xml;
          die();
      }
      /**
       * 生成APP端支付引數
       * @param  $prepayid   預支付id
       */
      public function getAppPayParams( $prepayid ){
          $data['appid'] = $this->appid;
          $data['partnerid'] = $this->mch_id;
          $data['prepayid'] = $prepayid;
          $data['package'] = 'Sign=WXPay';
          $data['noncestr'] = $this->genRandomString();
          $data['timestamp'] = time();
          $data['sign'] = $this->MakeSign( $data );
          return $data;
      }
      /**
       * 生成簽名
       *  @return 簽名
       */
      public function MakeSign( $params ){
          //簽名步驟一：按字典序排序陣列引數
          ksort($params);
          $string = $this->ToUrlParams($params);
          //簽名步驟二：在string後加入KEY
          $string = $string . "&key=".$this->key;
          //簽名步驟三：MD5加密
          $string = md5($string);
          //簽名步驟四：所有字元轉為大寫
          $result = strtoupper($string);
          return $result;
      }
      /**
       * 將引數拼接為url: key=value&key=value
       * @param   $params
       * @return  string
       */
      public function ToUrlParams( $params ){
          $string = '';
          if( !empty($params) ){
              $array = array();
              foreach( $params as $key => $value ){
                  $array[] = $key.'='.$value;
              }
              $string = implode("&",$array);
          }
          return $string;
      }
      /**
       * 輸出xml字元
       * @param   $params     引數名稱
       * return   string      返回組裝的xml
       **/
      public function data_to_xml( $params ){
          if(!is_array($params)|| count($params) <= 0)
          {
              return false;
          }
          $xml = "<xml>";
          foreach ($params as $key=>$val)
          {
              if (is_numeric($val)){
                  $xml.="<".$key.">".$val."</".$key.">";
              }else{
                  $xml.="<".$key."><![CDATA[".$val."]]></".$key.">";
              }
          }
          $xml.="</xml>";
          return $xml;
      }
      /**
       * 將xml轉為array
       * @param string $xml
       * return array
       */
      public function xml_to_data($xml){
          if(!$xml){
              return false;
          }
          //將XML轉為array
          //禁止引用外部xml實體
          libxml_disable_entity_loader(true);
          $data = json_decode(json_encode(simplexml_load_string($xml, 'SimpleXMLElement', LIBXML_NOCDATA)), true);
          return $data;
      }
      /**
       * 獲取毫秒級別的時間戳
       */
      private static function getMillisecond(){
          //獲取毫秒的時間戳
          $time = explode ( " ", microtime () );
          $time = $time[1] . ($time[0] * 1000);
          $time2 = explode( ".", $time );
          $time = $time2[0];
          return $time;
      }
      /**
       * 產生一個指定長度的隨機字串,並返回給使用者
       * @param type $len 產生字串的長度
       * @return string 隨機字串
       */
      private function genRandomString($len = 32) {
          $chars = array(
              "a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k",
              "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v",
              "w", "x", "y", "z", "A", "B", "C", "D", "E", "F", "G",
              "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R",
              "S", "T", "U", "V", "W", "X", "Y", "Z", "0", "1", "2",
              "3", "4", "5", "6", "7", "8", "9"
          );
          $charsLen = count($chars) - 1;
          // 將陣列打亂
          shuffle($chars);
          $output = "";
          for ($i = 0; $i < $len; $i++) {
              $output .= $chars[mt_rand(0, $charsLen)];
          }
          return $output;
      }
      /**
       * 以post方式提交xml到對應的介面url
       *
       * @param string $xml  需要post的xml資料
       * @param string $url  url
       * @param bool $useCert 是否需要證書，預設不需要
       * @param int $second   url執行超時時間，預設30s
       * @throws WxPayException
       */
      private function postXmlCurl($xml, $url, $useCert = false, $second = 30){
          $ch = curl_init();
          //設定超時
          curl_setopt($ch, CURLOPT_TIMEOUT, $second);
          curl_setopt($ch,CURLOPT_URL, $url);
          curl_setopt($ch,CURLOPT_SSL_VERIFYPEER,FALSE);
          curl_setopt($ch,CURLOPT_SSL_VERIFYHOST,2);
          //設定header
          curl_setopt($ch, CURLOPT_HEADER, FALSE);
          //要求結果為字串且輸出到螢幕上
          curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
          if($useCert == true){
              //設定證書
              //使用證書：cert 與 key 分別屬於兩個.pem檔案
              curl_setopt($ch,CURLOPT_SSLCERTTYPE,'PEM');
              //curl_setopt($ch,CURLOPT_SSLCERT, WxPayConfig::SSLCERT_PATH);
              curl_setopt($ch,CURLOPT_SSLKEYTYPE,'PEM');
              //curl_setopt($ch,CURLOPT_SSLKEY, WxPayConfig::SSLKEY_PATH);
          }
          //post提交方式
          curl_setopt($ch, CURLOPT_POST, TRUE);
          curl_setopt($ch, CURLOPT_POSTFIELDS, $xml);
          //執行curl
          $data = curl_exec($ch);
          //返回結果
          if($data){
              curl_close($ch);
              return $data;
          } else {
              $error = curl_errno($ch);
              curl_close($ch);
              return false;
          }
      }
      /**
       * 錯誤程式碼
       * @param  $code       伺服器輸出的錯誤程式碼
       * return string
       */
      public function error_code( $code ){
          $errList = array(
              'NOAUTH'                =>  '商戶未開通此介面許可權',
              'NOTENOUGH'             =>  '使用者帳號餘額不足',
              'ORDERNOTEXIST'         =>  '訂單號不存在',
              'ORDERPAID'             =>  '商戶訂單已支付，無需重複操作',
              'ORDERCLOSED'           =>  '當前訂單已關閉，無法支付',
              'SYSTEMERROR'           =>  '系統錯誤!系統超時',
              'APPID_NOT_EXIST'       =>  '引數中缺少APPID',
              'MCHID_NOT_EXIST'       =>  '引數中缺少MCHID',
              'APPID_MCHID_NOT_MATCH' =>  'appid和mch_id不匹配',
              'LACK_PARAMS'           =>  '缺少必要的請求引數',
              'OUT_TRADE_NO_USED'     =>  '同一筆交易不能多次提交',
              'SIGNERROR'             =>  '引數簽名結果不正確',
              'XML_FORMAT_ERROR'      =>  'XML格式錯誤',
              'REQUIRE_POST_METHOD'   =>  '未使用post傳遞引數 ',
              'POST_DATA_EMPTY'       =>  'post資料不能為空',
              'NOT_UTF8'              =>  '未使用指定編碼格式',
          );
          if( array_key_exists( $code , $errList ) ){
              return $errList[$code];
          }
      }
  
  }