我希望这对你有用：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 );

如果帖子是“未分类”类别或“未分类”的子类别作为主类别，请将“/%category%/%postname%”的永久链接规则更改为“/%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 );