问Wordpress添加不同的metaboxes而不是保存

EN

    add_action('add_meta_boxes', 'dm_meta_box');
    function dm_meta_box() {
        add_meta_box("dm-slides", "Slider", 'dm_slides_box', "dm", "normal");
    }

    function dm_slides_box() {
    global $post;
    $dm_slides = get_post_meta($post->ID, "_dm_slides231211ab", true);
    $dm_slides = ($dm_slides != '') ? json_decode($dm_slides) : array();

    $dm_title = get_post_meta($post->ID, "_dm_slides231211bc", true);
    $dm_title = ($dm_title != '') ? json_decode($dm_title) : array();

    $dm_link = get_post_meta($post->ID, "_dm_slides231211bf", true);
    $dm_link = ($dm_link != '') ? json_decode($dm_link) : array();

    $html = '<input type="hidden" name="dm_slider_box_nonce" value="' . wp_create_nonce(basename(__FILE__)) . '" />';
...
}

add_action('save_post', 'dm_save_slider_info');
function dm_save_slider_info($post_id) {
   if (!wp_verify_nonce($_POST['dm_slider_box_nonce'], basename(__FILE__))) {
        return $post_id;
    }
    if (defined('DOING_AUTOSAVE') && DOING_AUTOSAVE) {
        return $post_id;
    }
    if ('dm' == $_POST['post_type'] && current_user_can('edit_post', $post_id)) {
        $dm_slides = (isset($_POST['dm_slider_fields']) ? $_POST['dm_slider_fields'] : '');
        $dm_slides = strip_tags(json_encode($dm_slides));
        update_post_meta($post_id, "_dm_slides231211ab", $dm_slides);  

        $dm_title = (isset($_POST['dm_title']) ? $_POST['dm_title2'] : '');
        $dm_title = strip_tags(json_encode($dm_title));
        update_post_meta($post_id, "_dm_slides231211bc", $dm_title);          

        $dm_link = (isset($_POST['dm_link']) ? $_POST['dm_link2'] : '');
        $dm_link = strip_tags(json_encode($dm_link));
        update_post_meta($post_id, "_dm_slides231211bf", $dm_link);      

    } else {
        return $post_id;
    }
}