public function actionNewAGroup()
 {
     $session = Yii::$app->session;
     $groupform = new GroupForm();
     $message = '';
     //未登录
     if (empty($session['user'])) {
         echo $meaasge = Html::tag('a', '请登录', ['href' => '?r=forum/lee-login']);
     } else {
         if ($groupform->load(Yii::$app->request->post()) && $groupform->validate()) {
             $group = new Groups_info();
             $groupmem = new Group_mem();
             $group->name = $groupform['name'];
             $group->introduction = $groupform['introduction'];
             $group->announcement = $groupform['announcement'];
             $group->save();
             $groupmem->userid = $session['user'];
             $groupmem->groupid = $group->groupid;
             $groupmem->property = 0;
             $groupmem->username = $session['username'];
             $groupmem->save();
             return $this->redirect('?r=forum/group');
         } else {
             return $this->render('newagroup', ['groupform' => $groupform, 'meaasge' => $message]);
         }
     }
 }