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$sortBy = "";
        if ( isset($_REQUEST['sortBy']) && ! empty($_REQUEST['sortBy'])) {
        // Get sort direction and field sort.
            $sortByParts  = explode("-", $_REQUEST['sortBy']);
            if ( is_array($sortByParts) && ! empty($sortByParts[0]) && ! empty($sortByParts[1])) {
                $sortBy     = $sortByParts[0];
                $direction  = $sortByParts[1];
            }   
        } 
switch ($sortBy)
            case "discount":
                $sortFieldBy = $sortBy;
                break;
            case "created":
                $sortFieldBy = $sortBy;
                break;
            case "vendor":
                $sortFieldBy = $sortBy;
                break;
            case "actual_euprice":
                $sortFieldBy = $sortBy;
                break;
            case "actual_euprice":
                $sortFieldBy = $sortBy;
                break;                
            case "top_sell_product":                
            default:
                $search->addAdditionalJoins(
                    "top_sell_product",
                    array("top_sell_product.prodlevid" => "p.prodlevid"),
                    SEARCH_ADDITIONAL_JOIN_TYPE_INNER,
                    array()
                );