public function actionQuitGroup($groupid) { $session = Yii::$app->session; //群不存在 if (empty(Groups_info::find()->where(['groupid' => $groupid])->one())) { $message = '该群不存在'; } else { if (!in_array($groupid, $session['groupid'])) { echo "你不是该群成员"; } else { //删除成员 Group_mem::deleteAll(['groupid' => $groupid, 'userid' => $session['user']]); return $this->redirect('?r=forum/group'); } } }