Use the_taxonomies() to create a simple list
you can use wp_get_post_terms() to get a list of the post categories and just output the category slug which is already phrased for you, something like this: //in your loop echo ‘<div class=”cat-hidden’; $cats = wp_get_post_terms($post->ID,’category’); foreach($cats as $cat){ echo ‘ ‘.$cat->slug; } echo ‘”></div>’;