本文将带你了解微信开发38----临时二维码，希望本文对大家学微信有所帮助。

我们要做一个临时的二维码，就类似超市的最后抢购30秒。

临时二维码手册的查找方式几乎差不了什么

第一步都是需要先申请到一个ticket值，然后通过ticket值去换取二维码，temp_qrcode.php代码如下：

ticket;    //通过ticket来换取二维码    $ticket = urlencode($ticket);    $url = "https://mp.weixin.qq.com/cgi-bin/showqrcode?ticket={$ticket}";    $filee = file_get_contents($url);    //把该二维码文件保存到空间里的rqcode文件夹内，如果是linux系统要要修改下文件权限 chown -R www:www   ./rqcode/    $file_name =   "qrcode{$scene_id}.jpg";    file_put_contents("./qrcode/".$file_name,$filee);    $rqcode_url =   "//weixin.showtp.com/qrcode/{$file_name}";?>

生成临时性二维码   50秒内扫描该二维码即可赠送美国充气娃娃

index.php代码如下：

checkSignature()){            echo $echoStr;            exit;        }      }    public function   responseMsg()    {        //get post data, May be due to the   different environments        $postStr   = $GLOBALS["HTTP_RAW_POST_DATA"];                  //extract post data        if (!empty($postStr)){                /*   libxml_disable_entity_loader is to prevent XML eXternal Entity   Injection,                   the best   way is to check the validity of xml by yourself */                // 使用simplexml技术对xml进行解析                 //   libxml_disable_entity_loader(true), 是从安全性考虑，为了防止xml外部注入，                //只对xml内部实体内容进行解析                  libxml_disable_entity_loader(true);                //加载 postStr 字符串                $postObj =   simplexml_load_string($postStr, 'SimpleXMLElement', LIBXML_NOCDATA);                $fromUsername =   $postObj->FromUserName;                  $toUsername = $postObj->ToUserName;                $keyword =   trim($postObj->Content);                  $time = time();                  global $tmp_arr;                                //当用户公众号有互动时，我们将会动hd_time字段更新                $connect = mysql_connect('localhost','root','root')   or die('数据库链接失败');                  mysql_select_db('wxdb',$connect);                mysql_query('set names   utf8');                $sql =   "update qf_users set hd_time='{$time}' where   openid='{$fromUsername}'";                  mysql_query($sql, $connect);                                  //根据接收到的消息类型，来进行分支处理(switch)                switch($postObj->MsgType)                {                    case 'event':                        //用户未关注时，进行关注后的事件推送                          if($postObj->Event == 'subscribe')                        {                                                          $contentStr = "欢迎关注leigood微信测试号噢";                            $resultStr =   sprintf($tmp_arr['text'], $fromUsername, $toUsername, $time,   $contentStr);                              echo $resultStr;                               //当用户订阅时，根据用户的扫描情况来保存该用户                            $connect =   mysql_connect('localhost','root','root') or die('连接数据库失败');                              mysql_select_db('wxdb',$connect);                            mysql_query('set   names utf8');                              //这里的EventKey是手册上告诉我们的，EventKey事件KEY值，qrscene_为前缀，后面为二维码的参数值                              //EventKey也就是我们的场景值                            $EventKey =   $postObj->EventKey;                            $sql =   "insert into qrcode_users (id,openid,scene_id)   values(NULL,'{$fromUsername}','{$EventKey}')";                            mysql_query($sql);                          //这下面的EventKey是来自temp_qrcode.php文件里面自己定义的$scene_id的值                        }else   if($postObj->Event == 'SCAN' && $postObj->EventKey   == '500')                        {                            $contentStr =   '恭喜您，您已经成功抢到我们美国菲尔兰州充气娃娃一份';                            $resultStr =   sprintf($tmp_arr['text'], $fromUsername, $toUsername, $time,   $contentStr);                              echo $resultStr;                          }                                                  break;                    case   'text': //回复文本模块                          //这里开始测试客服消息接口了                          if(!empty($keyword)){                           //将用户提交的内容入库                           $connect =   mysql_connect('localhost','root','root') or die('连接数据库失败');                             mysql_select_db('wxdb',$connect);                           mysql_query('set   names utf8');                             $sql = "insert into zx_info (id,openid,zx_info)   values(NULL,'{$fromUsername}','{$keyword}')";                           mysql_query($sql);                                                        $contentStr = '您的咨询消息我们已经收到，稍后将会有我们的客服代表进行回复';                           $resultStr =   sprintf($tmp_arr['text'], $fromUsername, $toUsername, $time,   $contentStr);                             echo $resultStr;                          }else{                              $contentStr = '您输入的格式有误';                            $resultStr =   sprintf($tmp_arr['text'], $fromUsername, $toUsername, $time,   $contentStr);                              echo $resultStr;                          }                          break;                    case   'image': //处理用户上传图片                          $media_id = $postObj -> MediaId; //获取到用户上传的图片的mediaid                        $resultStr =   sprintf($tmp_arr['image'], $fromUsername, $toUsername, $time, $media_id);                        echo $resultStr;                                                  //将图片保存到本地服务器的文件系统                        //1.先给图片创建一个名字                        $image_file_name =   time().'.jpg';                          //2.获取该图片的内容                          $image_file = file_get_contents($postObj->PicUrl);                          //3.保存到本地服务器的文件系统                          //提醒：一定要保证您创建的文件夹是www用户可读可写，否则无法保存该图片到文件夹下                          file_put_contents("./uploadimage/".$image_file_name,$image_file);                                                  //将图片的路径和相关信息入库                          //1.创建一张表                          //2.链接mysql数据库，并且添加图片信息                        $connect =   mysql_connect('localhost','root','root');                          mysql_select_db('wxdb',$connect);                        mysql_query('set   names utf8');                          $media_path = "./uploadimage/".$image_file_name; //路径                        $sql = "insert into   keep_image_uploads (id,openid,media_id,media_path)   values(NULL,'{$fromUsername}','{$media_id}','{$media_path}')";                          mysql_query($sql,$connect);                          break;                    case   'voice': //处理用户上传语言的业务逻辑                        $media_id = $postObj   -> MediaId; //获取media_id的id号                        $resultStr =   sprintf($tmp_arr['voice'], $fromUsername, $toUsername, $time,   $media_id);                        echo   $resultStr;                          break;                    case   'location': //处理用户上传的地理位置信息                        $Location_X =   $postObj -> Location_X; //获取上传地理位置的纬度                        $Location_Y =   $postObj -> Location_Y; //获取上传地地理位置经度                        $contentStr =   "您上报的地理位置是:\n经度是：{$Location_Y} \n纬度是: {$Location_X}";                        $resultStr =   sprintf($tmp_arr['text'], $fromUsername, $toUsername, $time,   $contentStr);                          echo $resultStr;                          break;                    case   'link': //接收并回复链接信息                          //获取到用户上传的链接信息                          $Title = $postObj -> Title;                        $Url = $postObj   -> Url;                          $contentStr = "{$Title}";                        $resultStr =   sprintf($tmp_arr['text'], $fromUsername, $toUsername, $time,   $contentStr);                          echo $resultStr;                          break;                                          }        }else {            echo "";            exit;        }      }            private function   checkSignature()    {        // you must define TOKEN by   yourself        if   (!defined("TOKEN")) {              throw new Exception('TOKEN is not defined!');        }                $signature =   $_GET["signature"];          $timestamp = $_GET["timestamp"];        $nonce =   $_GET["nonce"];                        $token = TOKEN;        $tmpArr = array($token, $timestamp,   $nonce);        // use SORT_STRING   rule        sort($tmpArr,   SORT_STRING);        $tmpStr = implode(   $tmpArr );        $tmpStr = sha1(   $tmpStr );                if( $tmpStr   == $signature ){            return   true;        }else{            return false;        }      }}//如果这段代码放在上面，那程序将会报错，因为继承的问题，会显示类没有找到$wechatObj = new   wechatCallbackapiTest();//当接入成功后，请注销这句话，否则，会反复验证。//$wechatObj->valid();//添加响应请求的语句$wechatObj->responseMsg();?>

index.php核心代码如下：

临时二维码重点提示以下，如果是分两次进行扫描，那么最后的效果就是他会在永久二维码的数据库里面增加一条数据，但重点还是看永久二维码里面的业务逻辑是如何写的了

ticket

本文由职坐标整理并发布，希望对同学们有所帮助。了解更多详情请关注职坐标移动开发之微信频道！