默认情况下，WordPress不会在上次更新分类术语时保留数据库值。

所以，为了实现您的目标，一种解决方案是循环浏览您的帖子，并按日期或上次修改的时间排序。在循环过程中，您可以将分配给职位的术语/类别存储在变量中。最后，你会有很多你想要的“新鲜类别”。

在下面的代码中，我使用的是“product”post类型和“product\\u cat”分类法。你可能想把它们分别改为“post”和“category”。

function display_terms_with_fresh_posts() {

    $out = \'\';

    $args = array(
        \'post_type\' => \'product\', // CHOOSE YOUR POST TYPE!!!
        \'posts_per_page\' => -1,
        \'order\' => \'DESC\',
        \'orderby\' => \'date\' // Use \'date\' to get the last created or \'modified\' to get last updated.
    );

    $q = new WP_Query( $args );

    // Set the var which will keep the wanted terms.
    $fresh_terms = array();

    // Set the counter which will help us to get just as many categories as we want.
    $i = 0;

    if ( $q->have_posts() ) :
        while ( $q->have_posts() ) : $q->the_post();

            $post_id = get_the_ID();
            $taxonomy = \'product_cat\'; // CHOOSE YOUR TAXONOMY!!!

            $post_terms = get_the_terms( $post_id, $taxonomy );

            if ( !$post_terms )
                continue;

            foreach ( $post_terms as $t ) {
                if ( !in_array( $t->term_id, $fresh_terms ) ) {

                    // Here we choose how many categories to display. In this case I chose 5, that\'s why the var $i needs to be at least greater than 4.
                    if ( $i > 4 ) {
                        $stop_loop = true;

                        break;
                    }
                    else {
                        $fresh_terms[] = $t->term_id;

                        $i++;
                    }

                }

                // IMPORTANT! If u want to get all the terms assigned to each post u need to remove break from here.
                // This means that using break we will get just one term for each post.
                break;
            }

            if ( isset( $stop_loop ) )
                break;

        endwhile;
    else:
        $out = __( \'No posts for this post type were found.\' );
    endif;

    if ( $fresh_terms ) {

        foreach ( $fresh_terms as $term_id ) {
            $term_data = get_term( $term_id );
            $term_link = get_term_link( $term_id );

            $out .= "$term_data->name";
        }

    }

    return $out;

}

add_shortcode( \'fresh_categories\', \'display_terms_with_fresh_posts\' );

现在，您已经添加了显示“新类别”的快捷码，您可以在管理区域的页面中使用它，以您想要的方式打印类别：

[fresh_categories]

如果您想在php文件中使用它，只需执行以下操作：

echo do_shortcode("[fresh_categories]");

请注意我在代码片段中留下的注释。如果你想修改一下，它会对你有所帮助。