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I am trying to make a custom sidebar for my posts in certain categories. It will look something like this.

enter image description here

My category structure looks like this:

  • Parent 1
    • Child 1
      • Sub Child 1
      • Sub Child 2
    • Child 1
      • Sub Child 1
      • Sub Child 2
  • Parent 2

What I want to do is to display all posts under Sub Child 1 and 2. I will be more specific, lets say we have 3 posts, 2 of them is under sub child 1 and last one is under sub child 2. Then I only want the 2 posts that is under sub child 1 to be displayed under Sub child 1, and the 3 :rd post to display only under sub child 2.

I have been looking in 2 days now over the Internet to figure this out how to do this, but I dont get what I am doing wrong.

Here is my code and what I am trying to modify:

$cat = get_the_category();
$catID = get_cat_ID($cat);
$subcats = get_categories('child_of=' . $catID);
    foreach($subcats as $subcat) {
    echo '<h3>';
    echo '<a href="' . get_category_link($subcat->cat_ID) . '">';
    echo '/' . $subcat->cat_name . '';
    echo '</a></h3>';
    echo '<ul>';
    $subcat_posts = get_posts('cat=' . $subcat->cat_ID);
    foreach($subcat_posts as $subcat_post) {
        $postID = $subcat_post->ID;
    echo '<li>';
    echo '<a href="' . get_permalink($postID) . '">';
    echo get_the_title($postID);
    echo '</a></li>';
    echo '</ul>';

Any ideas?

share|improve this question
up vote 2 down vote accepted

I guess you could take a big step using wp_list_categories() with a walker to add a additional Unordered List to every item.

The code:

$cat_id = get_query_var( 'cat' );
$subcats = get_categories( 'child_of=' . $cat_id ); // child categories

class Cat_Walker extends Walker_Category {
    function end_el( &$output, $page, $depth = 0, $args = array() ) {
        $posts = get_posts( 'cat=' . $page->term_id );

        if ( sizeof( $posts ) > 0 ) {
            $output .= '<ul>';

            foreach ( $posts as $post ) {
                $output .= sprintf( '<li><a href="%1$s">%2$s</a></li>', get_permalink( $post->ID ), $post->post_title );

            $output .= '</ul>';

        $output .= '</li>';

foreach ( $subcats as $subcat ) {
    $subsubcats = get_categories( 'child_of=' . $subcat->term_id ); // sub child categories

    foreach ( $subsubcats as $subsubcat ) {
        $args = array(
            'title_li'         => '',
            'show_option_none' => '',
            'taxonomy'         => 'category',
            'child_of'         => $subsubcat->term_id,
            'walker'           => new Cat_Walker( )

        wp_list_categories( $args );
share|improve this answer
Thanks for reply, I would call myself a noob on php, but how does the walker work? What do I have to pass with args to make it work? – user2121214 Mar 8 '13 at 11:54
I added some arguments to $args for you, this will give you a clean Unordered List wich you can style with CSS to get the look you want. For more arguments, see this page in the Codex. – Mike Madern Mar 8 '13 at 12:05
It shows parent categorys, and for each category it displays the post under it, how do i exclude the parent and child. So that I only have Sub Child category. And it also displays every single category on the site. How do I display all sub cateogries in Child 1, 2 or 3? Thanks for the reply! – user2121214 Mar 8 '13 at 14:06
I altered the code a little, now you will have an Unordered List for every sub child category with their posts. – Mike Madern Mar 8 '13 at 14:38
How do I make it show only all the sub categories that are under parent category (Child 1), now it shows all of sub categories. It will show All Sub categories only under child 1, becuse the post is under child 1. So then you can easy go to another sub category if you like. Thanks for reply, this means alot! – user2121214 Mar 8 '13 at 14:54

Function for get all category and their post for a particuler parent category

function get_cat_subcat_posts($catid){

        $categories =  get_categories('child_of='.$catid);


            foreach ($categories as $category) {

            $category_id = $category->term_id;

            if ( have_posts() ) :

             <div class="detail_row">
             <h3><?php echo $category->name; ?><span></span></h3>

            // Start the Loop.
            while ( have_posts() ) : the_post();            

                  <li><a href="<?php the_permalink();?>"><?php the_title(); ?></a></li>




            // Recall the category posts function



share|improve this answer
This function can display multilevel category and their posts thanks. copy this from function get_cat_subcat_posts($catid){ – Yogesh Kumar Panchal Sep 23 '14 at 10:04
Call the Function like $catid = get_cat_ID('Bible Studies'); get_cat_subcat_posts($catid); – Yogesh Kumar Panchal Sep 23 '14 at 10:05
Please: Additional infos as edits to your answer. – kaiser Sep 23 '14 at 10:42

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