wordpress wp_list_categories problem

1 comment

1. You can probably do this with a Walker, but I tried it the old-fashioned way.

   $categories = get_categories();
   
   // First index all categories by parent id, for easy lookup later
   $cats_by_parent = array();
   foreach ($categories as $cat) {
       $parent_id = $cat->category_parent;
       if (!array_key_exists($parent_id, $cats_by_parent)) {
           $cats_by_parent[$parent_id] = array();
       }
       $cats_by_parent[$parent_id][] = $cat;
   }
   
   // Then build a hierarchical tree
   $cat_tree = array();
   function add_cats_to_bag(&$child_bag, &$children)
   {
       global $cats_by_parent;
       foreach ($children as $child_cat) {
           $child_id = $child_cat->cat_ID;
           if (array_key_exists($child_id, $cats_by_parent)) {
               $child_cat->children = array();
               add_cats_to_bag($child_cat->children, $cats_by_parent[$child_id]);
           }
           $child_bag[$child_id] = $child_cat;
       }
   }
   add_cats_to_bag($cat_tree, $cats_by_parent[0]);
   
   // With this real tree, this recursive function can check for the cats you need
   function has_children_with_posts(&$children)
   {
       $has_child_with_posts = false;
       foreach ($children as $child_cat) {
           $has_grandchildren_with_posts = false;
           if (isset($child_cat->children)) {
               // Here is our recursive call so we don't miss any subcats
               if (has_children_with_posts($child_cat->children)) {
                   $has_grandchildren_with_posts = true;
               }
           }
           if (0 < intval($child_cat->category_count)) {
               $has_child_with_posts = true;
           } else if ($has_grandchildren_with_posts) {
               // This is a category that has no posts, but does have children that do
               $child_cat->is_empty_with_children = true;
               var_dump($child_cat->name);
           }
       }
       return $has_child_with_posts;
   }
   has_children_with_posts($cat_tree);
   

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