好吧，似乎这不是现成的支持。至少我没找到arguments you can use for WP_Term_Query （这是后面使用的功能get_categories()).

所以我有以下想法

检索所有类别从每个类别获取最新帖子保存类别id（&L）；在数组中发布日期

function get_most_recent_categories($limit = 5) {
    // retrieve all categories
    $categories = get_categories();
    $recent_posts = array();
    foreach ($categories as $key=>$category) {
        // get latest post from $category
        $args = array(
            \'numberposts\' => 1,
            \'category\' => $category->term_id,
        );
        $post = get_posts($args)[0];
        // save category id & post date in an array
        $recent_posts[ $category->term_id ] = strtotime($post->post_date);
    }

    // order by post date, preserve category_id
    arsort($recent_posts);

    // get $limit most recent category ids
    $recent_categories = array_slice(array_keys($recent_posts), 0, $limit);

    return $recent_categories;
}