The session problem in TP frame

Why the same session cannot be used in 2 controllers under a module in the development of public platform

//网页授权获取用户基本信息    public function webUsers(){        $token=session('token');          $wechatAuth=new WechatAuth($this->appId,$this->appSecret,$token);         //$wechatAuth=$this->wechatAuth;                if($_GET['iscode']){            $url="http://hdzs.zhed.com/index.php/Activity/index";            $result=$wechatAuth->getRequestCodeurl($url);            header("Location:{$result}");                    }else         if($_GET['code']){                        header('Content-type:text/html;charset=utf-8');                        $users=$wechatAuth->getAccessToken('code',$_GET['code']);//疑惑语句                        $User=M("User");//实例化user对象            $openid=$users['openid'];            session('openid',"$openid");//将用户的openid存入session中

public function users($wechat,$data){            $openid=$data['FromUserName'];        //session(null);        // session('openid',"$openid");        //$wechatAuth=$this->wechatAuth;//实例化 $wechatAuth对象        ///$user=$wechatAuth->UserInfo($openid);        $text="你的用户名是：". session('openid');        $this->logger("发送用户消息".$text);        //$wechat->replyText($text);    }```

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Why the same session cannot be used in 2 controllers under a module in the development of public platform

 //Web page authorization to get user basic information public Function webusers () {$token =session (' token ');         $wechatAuth =new Wechatauth ($this->appid, $this->appsecret, $token);                $wechatAuth = $this->wechatauth;            if ($_get[' Iscode ') {$url = "http://hdzs.zhed.com/index.php/Activity/index";            $result = $wechatAuth->getrequestcodeurl ($url);                    Header ("location:{$result}");                        }else if ($_get[' code ')} {header (' content-type:text/html;charset=utf-8 '); $users = $wechatAuth->getaccesstoken (' Code ', $_get[' Code ');//interrogative statement $User =m ("user");//Instantiate user            Like $openid = $users [' OpenID ']; Session (' OpenID ', ' $openid ');//The user's OpenID is credited to the session  

public function users($wechat,$data){            $openid=$data['FromUserName'];        //session(null);        // session('openid',"$openid");        //$wechatAuth=$this->wechatAuth;//实例化 $wechatAuth对象        ///$user=$wechatAuth->UserInfo($openid);        $text="你的用户名是：". session('openid');        $this->logger("发送用户消息".$text);        //$wechat->replyText($text);    }```

session(null);

session (NULL); The session has been emptied. Of course, I can't get it down here.

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