public function behaviors() { return [TimestampBehavior::className()]; }
public function behaviors() { return array_merge(parent::behaviors(), [TimestampBehavior::className(), ['class' => FileBehavior::className(), 'groups' => ['image' => ['type' => FileBehavior::TYPE_IMAGE, 'rules' => ['extensions' => ['png', 'jpg', 'jpeg'], 'maxSize' => 1024 * 1024]]]]]); }