Searching a hook which triggers when deleting a post to get all comments

Question

When deleting a post, all comments associated with this post get the status "post-trashed". I'm searching a hook for this event.

Tried these one without success: comment_approved_to_post-trashed comment_approved_to_trash

Answer 1

There are few other hooks to manipulated the trashed comment.

1. 'save_post': called after post is saved. You can check status of the post and manipulate its comment accordingly.
2. 'trashed_comment': called after comment is moved to trash status.
3. 'transition_comment_status': called whenever comment status is changed.

There are probably few others too. But, it depends what you want to do with the trashed comments.

Answer 2

Sadly your hook didn't trigger when deleting a post. But I just looked into the wordpress code and found the right hook:

* @uses do_action() on 'trashed_post_comments' after trashing

in the function

wp_trash_post_comments()

And then just add the action like that:

add_action('trashed_post_comments', 'sp_trashed_post_comments', 10, 2);
...
function sp_trashed_post_comments($postID, $statuses) {
    $commentIDs = array_keys($statuses);
    print_r($commentIDs); // echoes all commentIDs associated with the deleted post
}