这是我的当前代码single.php 文件它获取标签。但我想取而代之的是获取类别。我可以用$类别交换$标记吗。

        <div class="related-articles">
           <div class="related-articles-wrapper">

      <?php
            $orig_post = $post;
            global $post;
            $cats = wp_get_post_categories($post->ID);

            if ($cats) {
            $cat_ids = array();
            foreach($cats as $individual_cat) $cat_ids[] = $individual_cat->term_id;
            $args=array(
            \'category__in\' => $cat_ids,
            \'post__not_in\' => array($post->ID),
            \'posts_per_page\'=>3, // Number of related posts to display.
            \'ignore_sticky_posts\'=>1
            );

            $my_query = new wp_query( $args );

            while( $my_query->have_posts() ) {
              $my_query->the_post();
      ?>

<div class="posts__post" style="background-image: url(<?php echo get_the_post_thumbnail_url($post_id, \'thumbnail\'); ?> ) !important;">
                    <article>
                        <a class="posts__post--title" href="<?php the_permalink(); ?>"><h1><?php the_title(); ?></h1></a>
                        <div class="posts__post--meta">
                          <p class="posts__post__tag"><a href=""><?php the_category(\'&nbsp;/&nbsp;\'); ?></a></p>
                          <p class="posts__post__timestamp"><i class="fa fa-clock-o" aria-hidden="true"></i><?php echo time_ago(); ?></p>
                        </p>
                        </div>
                    </article>   
                </div>

                  <? }
                  }
                  $post = $orig_post;
                  wp_reset_query();
                  ?>
            </div>
        </div>