Reply To: Change post featured image based on user status

• John Huebner

• March 24, 2022 at 11:28 am

As I said, a post can only have one “_thumbnail_id”. I did some looking and it appears that all thumbnail function eventually call get_post_thumbnail_id() and like I said, the value returned can be filtered.

add_filter('post_thumbnail_id', 'replace_thumbnail_id_with_acf', 20, 2);
function replace_thumbnail_id_with_acf($thumbnail_id, $post) {
  $user_id_associated_with_post = /*you need to figure this out*/;
  // I don't have the condition here.
  // figuring out if some user on the site is logged in
  // when it is not the current user
  // is a complicated process
  // this is not something that WP will provide
  if (/*is the user associated with this post logged in?*/) {
    $image_id = get_field('image_when_logged_id', $post->ID, false);
    if ($image_id) {
      $thumbnail_id = $image_id;
    }
  } else {
    $image_id = get_field('image_when_logged_out', $post->ID, false);
    if ($image_id) {
      $thumbnail_id = $image_id;
    }
  }
  return $thumbnail_id;
}

As far as figuring out if the user that is associated with the given post is logged in or logged out, I found this: https://wordpress.stackexchange.com/questions/34429/how-to-check-if-a-user-not-current-user-is-logged-in