Order::behaviors PHP Method

    public function behaviors()
    {
        return ['CTimestampBehavior' => ['class' => 'zii.behaviors.CTimestampBehavior', 'setUpdateOnCreate' => true, 'createAttribute' => 'date', 'updateAttribute' => 'modified']];
    }

 public function behaviors()
 {
     return array_merge(parent::behaviors(), array());
 }