Get Child category "name" of post

menardmam, this is my solution:

    <?php $showPostsInCategory = new WP_Query(); $showPostsInCategory->query('cat=". $carouselCategory ."&showposts=". $carouselNumber ."');
     if ($showPostsInCategory->have_posts()) :  while ($showPostsInCategory->have_posts()) : $showPostsInCategory->the_post(); ?>
      <li>
           <?php $data = get_post_meta( $post->ID, 'key', true ); ?>
           <?php foreach((get_the_category()) as $category) {echo ( $category->cat_name != $carouselCategory ) ? $category->cat_name . ' ' : '';}?>
           <a href="https://wordpress.stackexchange.com/questions/45198/<?php  if ($data["custom_link' ]) { echo $data[ 'custom_link' ];} else { the_permalink(); } ?>">
           <?php the_post_thumbnail('sponsor', array('title' => "")); ?>
           </a>
      </li>
    <?php endwhile; endif; ?>

The get_the_category retrieves every category (parent and child) of your post, but by using the $category->cat_name != $carouselCategory part the parent category won’t be displayed, just the child.

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