本文将带你了解微信开发29----微信群发消息2，希望本文对大家学微信有所帮助。

我们上一步完成后，那么下一步就要开始考虑如果对方取消关注了，那么我们就需要从数据表里删除掉对方的信息，废话不多说，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 $tmp_arr;                  //根据接收到的消息类型，来进行分支处理(switch)                  switch($postObj->MsgType)                {                    case 'event':                          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;                                                           //消息回复后，我们将该用户加入qf_users表里面                            $connect = mysql_connect('localhost','root','root')   or die('数据库链接失败');                              mysql_select_db('wxdb',$connect);                            mysql_query('set   names utf8');                              $time = time();                            $sql = "insert   into qf_users (id,openid,hd_time)   values(NULL,'{$fromUsername}','{$time}')";                              mysql_query($sql,$connect);                        }                                                  //如果对方取消关注了，那么我们就需要从数据库里面删除掉                          if($postObj->Event == 'unsubscribe'){                            $connect =   mysql_connect('localhost','root','root') or die('数据库链接失败');                              mysql_select_db('wxdb',$connect);                            mysql_query('set   names utf8');                              $sql = "delete from qf_users where   openid='{$fromUsername}'";                            mysql_query($sql,$connect);                        }                                                  break;                    case   'text': //回复文本模块                          //这里开始测试客服消息接口了                          if($keyword == '文本'){                           //获取token                           require   'get_token.php';                             $contentStr = '这是客服接口的回复，我们可以帮助您什么？';                             //对发送的内容进行urlencode编码，防止中文乱码                           $contentStr =   urlencode($contentStr);                             //到时候我们我发送的内容我们放到一个数组里面去了                           $content_arr =   array('content'=>"{$contentStr}");                             //这里的意思是将来我要发送消息给这个用户                             $reply_arr =   array('touser'=>"{$fromUsername}",'msgtype'=>'text','text'=>$content_arr);                             //下一步就是将编码转成规定的json格式                           $post =   json_encode($reply_arr);                             //url解码，如果不解码他将会发来一段二进制代码                           $post =   urldecode($post);                             $url =   "https://api.weixin.qq.com/cgi-bin/message/custom/send?access_token={$access_token}";                             //这里我们来使用类的继承机制，来简化代码                           $this ->   http_request($url,$post);                             //这里是可以回复多条消息的，只需要在执行下这个函数即可                           //$this ->   http_request($url,$post);                        }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();?>

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