当我安装自定义帖子类型作为插件时，它会自动创建3个默认类别，如苹果、索尼、诺基亚。怎么可能呢？我的自定义帖子（&C）；分类代码：

function brands() {
    $labels = array(
        \'name\' => _x( \'Brands\', \'brands_creator\' ),
        \'singular_name\' => _x( \'Brand\', \'brands_creator\' ),
        \'add_new\' => _x( \'Add New Brand\', \'brands_creator\' ),
        \'add_new_item\' => _x( \'Add New Brand\', \'brands_creator\' ),
        \'edit_item\' => _x( \'Edit Brand\', \'brands_creator\' ),
        \'new_item\' => _x( \'New Brand\', \'brands_creator\' ),
        \'view_item\' => _x( \'View Brand\', \'brands_creator\' ),
        \'search_items\' => _x( \'Search Brands\', \'brands_creator\' ),
        \'not_found\' => _x( \'No Brands found\', \'brands_creator\' ),
        \'not_found_in_trash\' => _x( \'No Brands found in Trash\', \'brands_creator\' ),
        \'parent_item_colon\' => _x( \'Parent Brand:\', \'brands_creator\' ),
        \'menu_name\' => _x( \'Brands\', \'brands_creator\' ),
    );

    $args = array(
        \'labels\' => $labels,
        \'hierarchical\' => true,
        \'description\' => \'Brands filterable by genre\',
        \'supports\' => array( \'title\', \'editor\',\'thumbnail\',\'revisions\'),
        \'taxonomy\' => \'brand_type\',
        \'public\' => true,
        \'show_ui\' => true,
        \'show_in_menu\' => true,
        \'menu_position\' => 5,
        \'menu_icon\' =>get_bloginfo(\'url\').\'/wp-content/plugins/brands-creator/images/brand.png\',
        \'show_in_nav_menus\' => true,
        \'publicly_queryable\' => true,
        \'exclude_from_search\' => false,
        \'has_archive\' => true,
        \'query_var\' => true,
        \'can_export\' => true,
        \'rewrite\' => true,
        \'capability_type\' => \'post\'
    );

    register_post_type( \'brands_creator\', $args );
}

add_action( \'init\', \'brands\' );

function brand_taxonomy() {
    register_taxonomy(
      \'brand_type\',
        \'brands_creator\',
        array(
        \'labels\' => array(
                \'name\' => \'Brands Type\'
                ),

        )
    );

}
add_action( \'init\', \'brand_taxonomy\');

# Default Category that will create automatically#
function default_brand_type() {
    wp_insert_term(
        \'Example Category\',
        \'brand_taxonomy\',
        array(
          \'description\' => \'MFG Product taxonomy.\',
          \'slug\'        => \'dmfg\'
        )
    );
    wp_insert_term(
        \'EMFG\',
        \'brand_type\',
        array(
          \'description\' => \'EMFG Product taxonomy.\',
          \'slug\'        => \'demfg\'
        )
    );
    wp_insert_term(
        \'OMFG\',
        \'brand_type\',
        array(
          \'description\' => \'OMFG Product taxonomy.\',
          \'slug\'        => \'domfg\'
        )
    );
}
add_action( \'after_setup_theme\', \'default_brand_type\' );