I am trying to use add_rewrite_rule() to solve a pagination problem I am having. After a lot of research I know the answer. But it seems the second argument of add_rewrite_rule() is never working.

add_action( 'init', 'add_category_base_rewrite_rule' );
function add_category_base_rewrite_rule() {

I am using the plugin Debug This to check the rewrite rules

enter image description here

As you can see the second argument doesn't match what I put in my function. And no matter what I do it doesn't work.

I know the function is being called because it put my rule on the top.

What I am doing wrong?

  • 1
    did you flush rewrite rules after making changes?
    – Milo
    May 5, 2018 at 15:37
  • Yes I did. I put flush_rewrite_rules(true); right before my code in functions php. And tried to do it manually as well. Didn't work
    – Colen_br
    May 5, 2018 at 16:49
  • When you call flush_rewrite_rules, rules get rebuilt from whatever is currently added in that request, so you must add_rewrite_rule before a flush.
    – Milo
    May 5, 2018 at 17:38
  • I tried this.... What happens is that I can see the rule going up in the list, probably because of the 'top' parameter. But the rewrite still doesn't change. Am I missing something?
    – Colen_br
    May 6, 2018 at 11:00

1 Answer 1


on the rewrite flush, the rewrite rule created by the custom post type overwrite yours because the target is the same.

to avoid this, you can use this filter

const TAXONOMY_PUBLICACOES = "publicacoes";

add_filter(TAXONOMY_PUBLICACOES . "_rewrite_rules", function ($rules) {


    return $rules;

  • I tried putting this code before and after 'add_rewrite_rule'. What I noticed is the rule going up in the rules' list. But the rewrite value still doesn't change. Am I missing someting in the 'add_rewrite_rule' ?
    – Colen_br
    May 6, 2018 at 11:01
  • I am not even sure if this filter is being called. I tried to echo something inside the function to test, but I couldn't see the return.
    – Colen_br
    May 6, 2018 at 11:08
  • I manage to call the filter, using apply_filters. But when I var_dump($rules) inside the filter, it is returning NULL.
    – Colen_br
    May 6, 2018 at 11:21
  • 1
    The filter doesn’t run on every request, only when rules are flushed and rebuilt.
    – Milo
    May 6, 2018 at 21:29
  • Got it... But it still didn't work =/.... I can see the rule go up in the list. But the rewrite value doesn't update. Any other thoughts?
    – Colen_br
    May 7, 2018 at 23:53

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