我的客户在管理面板中拖拽子类别以更改其顺序。

我有以下代码输出特定类别父级的子类别：

$mainCategory = get_categories(
        array (
          \'parent\'    => $category_id[\'term_id\'],
          \'taxonomy\'  => \'product_cat\',
          \'orderby\'   =>  \'menu_order\'
        )
      );
      foreach( $mainCategory as $mc ) {
        $cat_link = get_category_link( $mc->term_id );
        echo \'<div class="main-category col-md-3">\';
        echo \'<a href="\'.$cat_link.\'">\';
        $thumbnail_id = get_woocommerce_term_meta( $mc->term_id, \'thumbnail_id\', true ); // Get Category Thumbnail
        $image = wp_get_attachment_url( $thumbnail_id ); 
        if ( $image ) {
          echo \'<div class="mc-img">\';
          echo \'<img src="\' . $image . \'" alt="" />\';
          echo \'</div>\';
        }
        echo \'<h2>\';
        echo $mc->name;
        echo \'</h2>\';
        echo \'<p>\';
        echo $mc->description;
        echo \'</p>\';
        echo \'<div class="mc-button">Explore Products</div>\';
        echo \'</a>\';
        echo \'</div>\';
      }

“menu\\u order”不起作用