帮助中心

function wp_list_categories_for_post_type($post_type, $args = '') {
    $exclude = array();

    // 获取指定文章类型（或自定义文章类型）文章的分类
    foreach (get_categories() as $category) {
        $posts = get_posts(array('post_type' => $post_type, 'category' => $category->cat_ID));

        //如果没有查到
        if (empty($posts))
            // 添加分类id到排除列表
            $exclude[] = $category->cat_ID;
    }

    // 设置查询参数arg
    if (! empty($exclude)) {
        $args .= ('' === $args) ? '' : '&';
        $args .= 'exclude='.implode(',', $exclude);
    }

    //显示分类
    wp_list_categories($args);
}

wp_list_categories_for_post_type('movie');

p_list_categories_for_post_type('movie','order=DESC&title_li=Cats');