<?php $parent_categories = get_categories( array( 'orderby' => 'slug', 'order' => 'ASC', 'parent' => 0 ) ); foreach( $parent_categories as $parent_category ) { ?> <li> <span class="btn btn-navbar"> <?php echo $parent_category->name ?> <i class="fa fa-caret-down" aria-hidden="true"></i> <ul class="card-menu"> <?php $categories = get_categories( array( 'orderby' => 'slug', 'order' => 'ASC', 'parent' => $parent_category->term_id ) ); foreach( $categories as $category ) { if ($category->slug != "chapters") { echo '<li><a class="menu-element" href="' . get_category_link($category->term_id) . '">' . $category->name . '</a></li>'; } } ?> </ul> </span> </li> <?php } ?>