I have three level category structure as bellow.
- parent 1 - parent sub 1 - child 1 - child 2 - parent sub 2 - child 3 - child 4
Unfortunately, some of posts doesn't fill correctly which means it ticks only the sub parent level or child level.
I have a specific requirement to get whole category structure by post id. So I used following code to retrieve the ids,
wp_get_post_categories( $post_id )
This is only giving me the category ids which was ticked, but I need the full category structure.
if a posts ticked only
child 2, from above code I get only
child 2 cat id. instead of that I need
parent sub 1 &
parent 1 cat ids.
How can I do that ?