public function behaviors()
{
$behaviors = parent::behaviors();
//Only can be accessed by root
$behaviors['access'] = ['class' => AccessControl::className(), 'rules' => [['allow' => true, 'roles' => ['@'], 'matchCallback' => function ($rule, $action) {
return Yii::$app->user->identity->isRoot();
}]]];
return $behaviors;
}
