[Hunabku]

I have cleaned up and added to jamesc code to include sub category nesting(indenting). I used a spacer.gif for indenting but you can substitute with unordered list, character space, etc.

In product.php around line 143 insert the following:

# This mod comes from xcart user forum - http://forum.x-cart.com/viewtopic.php?t=29077
# It puts a product's categories into an array so we can access them from the added template: customer/categories_for_selected_product.tpl.
# In the SELECT below [categories].categoryid_path contains the path or nesting of categoryid(s) ex. "256/262/270".
$cat_result = db_query(" SELECT $sql_tbl[products_categories].categoryid,$sql_tbl[categories].category,$sql_tbl[categories].parentid,$sql_tbl[categories].categoryid_path FROM $sql_tbl[products_categories], $sql_tbl[categories] WHERE $sql_tbl[products_categories].productid = $productid AND $sql_tbl[categories].categoryid = $sql_tbl[products_categories].categoryid AND $sql_tbl[categories].parentid != 0");  
$i = 0;
while ($category = db_fetch_row($cat_result)) { 
   if ($category) { $product_categories[] = $category;
   # The following two lines of code create the subcategory nesting(indent) values.
   # $category_path_chars gets an array of ascii character counts from categoryid_path.
   $category_path_chars = count_chars($product_categories[$i][3],1);
   # Replace the categoryid_path element with the number of times "/"(ascii char 47) occurs in categoryid_path.  Subtract 1 from this value and multiply by 12 (12px) for the pixel width of spacer.gif to indent each nested subcategory - see customer/categories_for_selected_product.tpl.
   $product_categories[$i][3] = ($category_path_chars['47']-1)*12; 
   $i++; } }
$smarty->assign("product_categories",$product_categories);

Now create a new template in the customer directory and call it "categories_for_selected_product.tpl" - this is just a modified "categories.tpl" file from the same directory. Include the following code:

{* $Id: categories_for_selected_product.tpl based on categories.tpl,v 1.23 2004/06/24 09:53:29 max Exp $ *}
{*** See product.php for the creation of the $product_categories array used below. ***}
{capture name=menu}
{section name=category loop=$product_categories}
<FONT class="CategoriesList">
{if $product_categories[category].3 > 0}
{*** Do indenting ***}
[img]{$ImagesDir}/spacer.gif[/img]
{/if}
{$product_categories[category].1}</FONT>

{/section}
{/capture}
{ include file="menu.tpl" dingbats="dingbats_categorie.gif" menu_title=$lng.lbl_categories menu_content=$smarty.capture.menu }

Now just include "categories_for_selected_product.tpl" in your customer/main/product.tpl.