显示类别和子类别

我知道以前有人问过这个问题，也有人回答过这个问题，但解决方案对我不起作用，所以我想知道是否有什么变化，或者我是否做错了什么。想要显示我的类别，儿童猫，孙子猫。这是我的代码：

function list_areas () {
$provincearg = array(
                            \'taxonomy\' => \'area\',
                            \'hide_empty\' => false,
                            \'parent\'=> 0,
                        );
    $provinces = get_terms ($provincearg);
        foreach ($provinces as $province) {
            echo \'<h2>\' .$province -> name. \'</h2>\';

            $municipalarg = array (
                                    \'taxonomy\' => \'area\',
                                    \'hide_empty\' => false,
                                    \'parent\'=> $province -> term_id,
                                    );
            $municipalities = get_terms ($municipalarg);

            echo \'<ul>\';
                foreach ($municipalities as $municipality) {
                    echo \'<li>\' .$municipality -> name. \'</li>\';
                }
            echo \'<ul>\';
        }
}

它输出类别，但不输出子类别。我甚至还输入了“家长”id，当我这样做时，什么都不会显示出来。

任何帮助都将不胜感激。

<?php $list_categories = get_categories( $args ); echo "<div class=\'container\'>"; echo "<div class=\'productsubmenu\'>"; echo "<ul>"; foreach ($list_categories as $cat) { if($cat->category_parent == 0) { $category_id = $cat->term_id; echo \'<li class="parent \'.$my.\' "><a href="\'.get_term_link( $cat ) . \'">\'.$cat->name.\'</a>\'; $args2 = array( \'taxonomy\' => $taxonomy, \'child_of\' => 0, \'parent\' => $category_id, \'orderby\' => $orderby, \'show_count\' => $show_count, \'pad_counts\' => $pad_counts, \'hierarchical\' => $hierarchical, \'title_li\' => $title, \'hide_empty\' => $empty ); $args = array( \'hierarchical\' => 1, \'show_option_none\' => \'\', \'hide_empty\' => 1, \'parent\' => $parent_cat_ID, \'taxonomy\' => \'product_cat\' ); $subcats = get_categories($args2); echo \'<ul class="wooc_sclist">\'; foreach ($subcats as $sc) { $link = get_term_link( $sc->slug, $sc->taxonomy ); echo \'<li class="" ><a href="\'. $link .\'">\'.$sc->name.\'</a></li>\'; } } echo \'</ul>\'; echo "</li>"; } ?>

按帖子类型筛选wp_Dropdown_Categories

我正在使用wp\\u dropdown\\u categories向媒体库添加类别过滤器。它工作正常，除了显示分配给帖子的所有类别，但我希望它只显示分配给附件的类别。如果只为附件更新计数也很好。下面是将类别添加到附件并允许您对其进行筛选的代码。/* Add categories to attachments/media library */ function wptp_add_categories_to_attachments() { register_taxonomy_for_objec

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按帖子类型筛选wp_Dropdown_Categories