I have to find a way to get the top level category of a post.
I have a few categories that function as top level category. They have no posts themselves. Beneath them are a few categories that contain posts. When I click one of them, for instance index.php?p=23 I want to know to what top level category this post belongs to, like this:
Animals
- Dogs
-- Golden Retriever
-- Husky
-- Rottweiler
In this case Golder Retriever belongs to top category 'Animals'.
Is there a way or a plugin that can do this? I need it to show a different image at the top of the page.
alexbalint
Member
Posted 5 years ago #
Hi there - found a solution! I needed this to show a full category tree in the sidebar, but the image idea is great also :)
The code is this:
function get_topLevelParent ($postid) {
$pdata = get_post($postid);
$parent = $pdata->post_parent;
if ($parent != 0) {
$r = get_topLevelParent($parent);
} else {
$r = $postid;
}
return $r;
}
This function returns the top-level parent of any post. You can use it to build a sidebar with all children of a 'master category'.
You can feed the current post ID to the function (it should work, I gave the parent ID anyway). Hope this solves your problem (even a little bit late :) )
