我正在遍历所有帖子，并试图输出与每个帖子相关的类别nicename。因此，如果有类别A、B和C，并且帖子X只与类别A和C关联，那么我只想输出类别A和C的nicename。

以下是循环：

<?php $subs = new WP_Query( array( \'post_type\' => \'case-study\' ));
      if( $subs->have_posts() ) : while( $subs->have_posts() ) : $subs->the_post(); ?>

      <?php the_title(); ?>

      <p>Associated Child Categories</p>
      //Show nicenames of each child category associated to each post
      <?php $category = get_categories($post->ID);
            foreach(($category) as $cats) { echo $category->category_nicename; }?>

<?php endwhile; endif; ?>