source/Application/Model/OrderArticle.php
public function getCategoryIds($blActCats = false, $blSkipCache = false)
    {
        $aCatIds = [];
        if ($oOrderArticle = $this->_getOrderArticle()) {
            $aCatIds = $oOrderArticle->getCategoryIds($blActCats, $blSkipCache);
        }

        return $aCatIds;
    }
public function getCategoryIds($blActCats = false, $blSkipCache = false)
    {
        $aCatIds = [];
        if ($oOrderArticle = $this->_getOrderArticle()) {
            $aCatIds = $oOrderArticle->getCategoryIds($blActCats, $blSkipCache);
        }

        return $aCatIds;
    }
public function getCategoryIds ( $ blActCats = false , $ blSkipCache = false ) { $ aCatIds = [ ] ; if ( $ oOrderArticle = $ this -> _getOrderArticle ( ) ) { $ aCatIds = $ oOrderArticle -> getCategoryIds ( $ blActCats , $ blSkipCache ) ; } return $ aCatIds ; }
Returns empty array, implements iBaseArticle interface getter method

@param bool $blActCats   select categories if all parents are active
@param bool $blSkipCache force reload or not (default false - no reload)

@return array
Returns empty array implements iBaseArticle interface getter method