I'm trying to debug a plugin which I didn't develop and I want to list all the registered actions. I've read this SO thread:

But it's specific to one hook and it's about filters, not actions.

Is there any variable like $wp_filter or something?

  • Use this plugin to show visually on a page https://wordpress.org/plugins/show-hooks/
    – Rafiq
    Jun 23, 2020 at 13:46
  • and you are the developer of that plugin, correct?
    – alexwc_
    Aug 24, 2020 at 2:57
  • Yes, I made this plugin for myself and then host it in WordPress.
    – Rafiq
    Aug 25, 2020 at 15:59
  • @Rafiq you should remove your show-hooks link as it is no longer valid. yesterday

1 Answer 1


Filters and actions are both assigned to hooks. Functions assigned to hooks are stored in global $wp_filter variable. So all you have to do is to print_r it.


PS. add_action function makes a add_filter call. And the latter does $wp_filter[$tag][$priority][$idx].

NOTE: you can directly add this code in functions.php, and you will see a debug on your site:

add_action('wp', function(){ echo '<pre>';print_r($GLOBALS['wp_filter']); echo '</pre>';exit; } );
  • nice, but where can i debug them? i tried to add if(WP_DEBUG == true){ global $wp_filter; print_r($wp_filter); } in index.php nad i got NULL
    – Jacer Omri
    Jul 2, 2013 at 14:57
  • my bad, shouldn't write global $wp_filter;
    – Jacer Omri
    Jul 2, 2013 at 15:03
  • OK, so you worked that out? Jul 2, 2013 at 15:12
  • Don't use the wp hook if you get memory problems. Place the code without hook in the functions.php.
    – jMike
    Sep 11, 2022 at 9:21

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge that you have read and understand our privacy policy and code of conduct.

Not the answer you're looking for? Browse other questions tagged or ask your own question.