这是代码的一部分，用于显示投资组合类别：

$post_cat = array();
                    $post_cat = wp_get_object_terms($post->ID, "portfolio_category");
                    $post_cats = array();

         $attachments = get_post_meta($post->ID, \'300-160-image\', true);

        if ($attachments) {         
                        $post_cat = array();
                        $post_cat = wp_get_object_terms($post->ID, "portfolio_category");
                        $post_cats = array();

                        $cats_pf_this = implode(":", $post_cats);

        $fg_imagemain.=\'{"url": "\'.get_bloginfo(\'template_directory\').\'/image.php?\'.str_replace("&", "&", $image_resizer_output).\'image=\'.$attachments.\'", "aid": \'.$post->ID.\', "color": "\'.addslashes(get_post_meta($post->ID, \'thumbnail_hover_color\', true)).\'", "thumb_title": "\'.addslashes($thumb_title).\'", "thumb_descr": "\'.addslashes($thumb_descr).\'", "thumb_cats": "\'.addslashes($cats_pf_this).\'", "fullimgsrc": "}\';

        var fg_divhoverbgmetadata = $("<div>").addClass("hoverbgpfthnailmetadata").html(\'<span class="thumb_title">\'+srcobj.thumb_title+\'</span><span class="thumb_cats">\'+srcobj.thumb_cats+\'</span><span class="thumb_plus">+</span>\');

我想做的是，同时显示公文包标签。我认为第一步是重复这一点：

$post_cats = array();
                    $post_cat = wp_get_object_terms($post->ID, "portfolio_category");

例如：

$post_tags = array();
                    $post_cat = wp_get_object_terms($post->ID, "portfolio_tags");

其余代码也是如此。我尝试过这个方法，但没有成功，我无法显示公文包项目标签。我做错了什么？

register_taxonomy(\'portfolio_tags\',
   array(\'portfolio\'), 
   array(\'hierarchical\' => false, \'show_ui\' => true, \'query_var\' => true, 
   \'rewrite\' => array( \'slug\' => \'portfolio-tags\' )));

 $post_cat = get_the_terms( $post->ID, \'portfolio_tags\' );