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1. edasque
   Member
   Posted 3 years ago #

   How does one use to list only the top categories ? I don't want any of the children:

   $categories= get_categories('child_of=0');

   I can't find a parameter that will tell get_categories to only list the root categories (those that have a parent of 0) and none of their children.

   Help ?

2. mores
   Member
   Posted 3 years ago #

   You need to create a loop, where you cycle through ALL categories, check if they have parents, and not use those.

   Off the top of my head:
   

   foreach (get_the_category() as $cat) {
   	$parent = get_category($cat->category_parent);
   	if (!get_category($cat->category_parent)) {
   		// do something with the category, like use it to create a new query_posts or something
   	}
   }

3. edasque
   Member
   Posted 3 years ago #

   is there no other way, seems wasteful (even if I don't have that many categories). I'd rather select from the get go the right ones.

4. mores
   Member
   Posted 3 years ago #

   How do you expect to know if a category has no parents if you do not look at it?
   :)

5. yakuphan
   Member
   Posted 3 years ago #

   Use wp_list_categories function with 'depth' parameter. get_categories has this parameter too.
   

   <ul>
     <?php
       wp_list_categories('depth=1');
     ?>
   </ul>

   See, http://codex.wordpress.org/Template_Tags/wp_list_categories

6. edasque
   Member
   Posted 3 years ago #

   Unfortunately get_categories doesn't have this depth parameter it seems. I can't use wp_list_categories because I want to insert something between the level 1 categories and their child:

   * Cat 1
   - View All
   - Child 1
   - Child 2
   * Cat 2
   - View All
   - Child 3
   - Child 4

7. Chris Burbridge
   Member
   Posted 2 years ago #

   The documentation for get_categories was a little sparse in terms of telling you what the returned properties of the category object were.

   So, I did print_r($cat) on the resultant categories. This was very handy. It told me that there is a parent property, that will have an ID of the parent category if there is one, and 0 if there is not one. Therefore, it was quite easy to add this bit of code at the top of my get_categories() loop to ignore non-top-level categories:

   if ($cat->parent > 0) { continue; }

   Here is the whole thing in an nutshell.

   foreach (get_categories() as $cat) {
   		if ($cat->parent > 0) { continue; }
   		[... and now do whatever you want with the wanted categories... ]
   	}

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