$objDb = new SC_Helper_DB_Ex();
        foreach ($this->arrGAOrderDetail as &$product) {
            $categories = $objDb->sfGetCategoryId($product['product_id'], 0, true);
            $category = $objDb->sfGetCat($categories[0]);
            $product['category'] = $category['name'];
        }

        $objDb = new SC_Helper_DB_Ex();
        foreach ($this->arrGAOrderDetail as &$product) {
            $categories = $objDb->sfGetCategoryId($product['product_id'], 0, true);
            $product['category'] = $categories[0];
        }

        $objDb = new SC_Helper_DB_Ex();
        foreach ($this->arrGAOrderDetail as &$product) {
        	$categories = $objDb->sfGetCategoryId($product['product_id'], 0, true);
        	foreach ($categories as $cat) {
        		$result = $objDb->sfGetCat($cat);
        		$arrRet[] = $result['name'];
        	}
        	$product['category'] = implode(', ', $arrRet);
        }