我创建了一个名为“map”的自定义post类型，并为其注册了一个新的分类法。现在，我需要通过一个循环，得到“map”的每个术语。到目前为止，我有一个“无效的分类法”，我不明白为什么会这样。除了这个，一切都很好！

如何注册新的分类法（在functions.php中）：

function create_map_taxonomy() {
        $labels = array(
            \'name\'                       => _x( \'Map_Category\', \'taxonomy general name\', \'textdomain\' ),
            \'singular_name\'              => _x( \'Map_Category\', \'taxonomy singular name\', \'textdomain\' ),
            \'search_items\'               => __( \'Search Map_Category\', \'textdomain\' ),
            \'popular_items\'              => __( \'Popular Map_Category\', \'textdomain\' ),
            \'all_items\'                  => __( \'All Map_Category\', \'textdomain\' ),
            \'parent_item\'                => null,
            \'parent_item_colon\'          => null,
            \'edit_item\'                  => __( \'Edit Map_Category\', \'textdomain\' ),
            \'update_item\'                => __( \'Update Map_Category\', \'textdomain\' ),
            \'add_new_item\'               => __( \'Add New Map_Category\', \'textdomain\' ),
            \'new_item_name\'              => __( \'New Map_Category Name\', \'textdomain\' ),
            \'separate_items_with_commas\' => __( \'Separate Map_Category with commas\', \'textdomain\' ),
            \'add_or_remove_items\'        => __( \'Add or remove Map_Category\', \'textdomain\' ),
            \'choose_from_most_used\'      => __( \'Choose from the most used Map_Category\', \'textdomain\' ),
            \'not_found\'                  => __( \'No Map_Category found.\', \'textdomain\' ),
            \'menu_name\'                  => __( \'Map_Category\', \'textdomain\' ),
        );

        $args = array(
            \'hierarchical\'          => true,
            \'labels\'                => $labels,
        );
        register_taxonomy( \'map_category\', \'map\', $args );
    }
    add_action( \'init\', \'create_map_taxonomy\', 0 );

这是我在页脚中的代码。php：

<?php 
    $args = array(
        \'post_type\' => \'map\',
    );

    $map_query = new WP_Query($args);

    while ($map_query->have_posts()) : $map_query->the_post();

        $img_background = get_field(\'image_background\');
        $cat = get_terms(get_the_id(), \'map_category\');
        var_dump($cat);

    endwhile; 
    wp_reset_query();
    ?>

结果总是“分类无效”。但是，当我在管理页面中看到它时，它怎么会是无效的分类法呢？