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j'ai testé avec ceci, mais ca ne fonctionne pas.

	{capture name="sql"}
  SELECT c2.id_category
  FROM `{$smarty.const._DB_PREFIX_}category` c
  INNER JOIN `{$smarty.const._DB_PREFIX_}category` c2 ON c2.id_parent = c.id_parent
  WHERE c.id_category = {$product->id_category_default|intval}
  ORDER BY c2.nleft
{/capture}
<ul>
{foreach Db::getInstance()->executeS($smarty.capture.sql) as $category_siblings}
   {if $category_siblings.id_category != $product->id_category_default}
  <li> <a href="{$link->getCategoryLink($category.id_category)}">{$category.name}</a> </li>
   {/if}
{/foreach}
</ul>