I'm using a custom permalink structure:


So that my posts are listed like:


This works fine as long as "blue-widget" exists in one and only one category. However, when it appears in more than one category, like perhaps a child of uncategorized, the resulting URL becomes:


Even though the post is still in "widgets", it appears that there is something that makes uncategorized trump it. I believe its because it has the lower id.

I need to know if its possible to exclude uncategorized and any children of uncategorized from appearing in the permalink structure.


So, if a post is in 3 categories for example:

Widgets (parent_id=0), Uncategorized (parent_id=0), Child of Uncategorized (parent_id=1)

I want the filter to use "Widgets" as the permalink slug and exclude "uncategorized" and all of its children.

If the post is in 2 or more categories that are not uncategorized or a child of uncategorized, then just use the newest category as the permalink slug.

If the post is assigned solely to uncategorized or one of its children, then do not display a category slug permalink

  • 1
    You could change the uncategorized category to another name. Feb 6, 2014 at 8:40
  • @Brad, fine but the children of uncategorized will still be displayed. I don't want any multi-level post slugs beyond the highest level category.
    – Scott B
    Feb 6, 2014 at 14:46

1 Answer 1


I hope this will work for you :D

function mf_post_link( $permalink, $post, $leavename ) {
  if( $post->post_type != 'post' ) return $permalink;

  // if no category, the filter is deactivated
  $cats = get_the_category($post->ID);
  if( ! count($cats) ) return $permalink;

  usort($cats, '_usort_terms_by_ID'); // order by ID
  $category_object = apply_filters( 'post_link_category', $cats[0], $cats, $post );

  $category_object = get_term( $category_object, 'category' );
  $parent = $category_object->parent;

  // if no father, the filter is deactivated
  if ( !$parent ) return;
  $category_parent = get_term( $parent, 'category' );

  // if the parent is not uncategorized, the filter is deactivated
  if( $category_parent->slug != 'uncategorized' ) return $permalink;

  return str_replace('uncategorized/', '', $permalink);

add_filter( 'post_link', 'mf_post_link', 9, 3 );


if the post is category "uncategorized" or child of "uncategorized" as the main category, change the permalink rule of "/%category%/%postname%" to "/%postname%"

function my_pre_post_link( $permalink, $post, $leavename ) {
  if( $post->post_type != 'post' ) return $permalink;
  $cats = get_the_category($post->ID);
  if( ! count($cats) ) return $permalink;

  usort($cats, '_usort_terms_by_ID');
  $category_object = apply_filters( 'post_link_category', $cats[0], $cats, $post );

  $category_object = get_term( $category_object, 'category' );

  return _clear_uncategorized($category_object, $permalink);

function _clear_uncategorized($cat, $permalink) {
  if( $cat->slug == 'uncategorized' ) {
    return str_replace('%category%/', '', $permalink);
  $parent = $cat->parent;
  if ( !$parent )
    return $permalink;
  return _clear_uncategorized($parent, $permalink);

add_filter( 'pre_post_link', 'my_pre_post_link', 9, 3 );
  • +1 Almost there Salem. It removes "uncategorized", however, the child category of uncategorized is still present.
    – Scott B
    Feb 6, 2014 at 4:41
  • Please add an explanation to your answer: why could that solve the problem?
    – fuxia
    Feb 6, 2014 at 6:57
  • Scott B, decime,¿ como queres que quede la url ? Feb 6, 2014 at 11:08
  • Sorry, my english is a fake. Tell me, how it is want the url? Feb 6, 2014 at 14:22
  • See the update I posted at the bottom of my question.
    – Scott B
    Feb 6, 2014 at 14:36

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