与其创建一个新的标记，我建议只编写代码，使用ACF的save\\u post函数在每篇文章的基础上创建slug。

//Update Cars slug field:
function wpse_post_slug_updater( $post_id ) {

    if( get_post_type() == \'cars\') {
        $my_post = array();
        $my_post[\'ID\'] = $post_id;
        $my_post[\'post_title\'] = esc_html(get_the_title($post_id));

        $my_new_slug = get_field(\'brand\') . \' \' . get_field(\'license_plate\');
        if(!empty($my_new_slug)){
            $my_post[\'post_name\'] = sanitize_title($my_new_slug);
            wp_update_post( $my_post );
        }
    }

}

// run after ACF saves the $_POST[\'fields\'] data
add_action(\'acf/save_post\', \'wpse_post_slug_updater\', 20);