For to start i would have created a override file in /override/controllers/, named CategoryController.php
And add this:
<?php
class CategoryController extends CategoryControllerCore
{
public function displayContent()
{
// Get the global smarty object.
global $smarty;
// Get current category's parent.
$parent_category = new Category($this->category->id_parent, self::$cookie->id_lang);
// Get parent category's subcategories (which is current category's siblings, including it self).
$category_siblings = $parent_category->getSubCategories((int)self::$cookie->id_lang)
/* Assign your siblings array to smarty. */
$smarty->assign(
array(
"category_siblings" => $category_siblings
)
);
/* This we run the normal displayContent, but pass the siblings array to
category.tpl */
parent::displayContent();
}
}
?>
I this the basic way to do it, i have not tested it get. You need to find a way to not list current category in the list of siblings.
If the code works you will now have an array in category.tpl named category_siblings, you now need to for example copy the code in category.tpl that outputs the subcategories and replace the subcategories arra with the category_siblings array.
]
