I'm currently using a filter applied to the Archive Widget. It's successfully filtering posts from the specific category (26) but now I also want to filter only PARENT posts, in order to count only PARENT posts from this category.

I'm currently using the following, but not working:

function my_nav_archives($args){
    $args['cat'] = 26;
    $args['post_parent'] = 0;

    return $args;
add_filter( 'widget_archives_args', 'my_nav_archives' );

Is there any other argument I can use? Thanks.

  • I'm not sure if you understand the definition of a Parent Post as it is used in the Wordpress structure. Pages (a type of post within WP) can have a hierarchical with PARENTS. Posts, by default, cannot. It would require a special plugin to add that hierarchy. Without that special structure, $args['post_parent']=0 should return all posts in $args['cat']=26. Have you added a plugin to establish hierarchical Posts? Commented Sep 13, 2019 at 18:42
  • 1
    Sorry I've not made that clear... Yes, I've added an ACTION to my functions.php that enables hierarchy in posts, using the code on the accepted answer here:stackoverflow.com/questions/10750931/…
    – Luis
    Commented Sep 17, 2019 at 10:21
  • Looking more closely at Wordpress Core , I'm actually surprised that your cat argument works. It appears the available arguments are totally different from WP_Query args. Take a look at function widget($args,$instance) beginning on line 42, and compare it to the codex. It would appear you just got lucky with $args['cat']. Hope somebody can prove me wrong and find a solution for you... Commented Sep 25, 2019 at 17:21

1 Answer 1


I haven't tested this, but I found a sample that was close. I have modified it to be similar to what you want. I'm not sure it is 100%, but it should get you really close:


function wpse_filter_parents_only($query){
    if (!is_admin() && is_category('26')){
    return $query;

This should update what WP_Query retrieves from the database, and only for category 26. If you need this to affect multiple categories, stuff them into an array and insert the array like this: is_category($cats).

Hope this helps!

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