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1. SlightlyAmiss
   Member
   Posted 1 year ago #

   Hello,

   I have been picking my brain (and the web) to come up with code that can generate a list of sub-category IDs, delimited by commas. I've tried so many things that it's hard to provide the code example that's gotten me the closest.

   However, the follow code generates a list of the child categories within parent ID 29:

   <ul>
   <?php wp_list_categories('orderby=id&show_count=1&use_desc_for_title=0&child_of=8'); ?>
   </ul>

   Is there some way to modify this code to display the subcat IDs instead of their names?

   Any help would be greatly appreciated!

   Thanks!

2. SlightlyAmiss
   Member
   Posted 1 year ago #

   The following block of code gets me a lot closer to where I want to be:

   <?php
   $category_ids = get_all_category_ids();
   foreach($category_ids as $cat_id) {
     $cat_name = get_cat_name($cat_id);
     echo $cat_id . ', ';
   }
   ?>

   Is there some way to stipulate that I only want the category IDs to be children of parent cat, in my case 31?

   Thanks!

3. SlightlyAmiss
   Member
   Posted 1 year ago #

   This was extremely helpful on a per-post basis. Not quite what I was looking for but will get me to my goal.

   <?php $parentcat = get_category_by_slug('system');
   foreach((get_the_category()) as $childcat):
     if (cat_is_ancestor_of($parentcat, $childcat)):
       echo $childcat->cat_ID;
     endif;
   endforeach; ?>

   I use multiple categories for every post, with this code I can input the parents slug in the first line and it will echo back out the corresponding sub category ID.

   Hope this can help someone!

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