我正在使用WPalchemy metabox类向页面编辑器添加一个额外的元字段，这将允许我将库附加到页面。我使用该类：

$gallery_metabox = new WPAlchemy_MetaBox(array(
    \'id\' => \'_gallery_meta\',
    \'title\' => \'Gallery\',
    \'template\' => STYLESHEETPATH . \'/inc/custom/gallery_meta.php\',
    \'types\' => array(\'post\', \'page\', \'events\'),
    \'priority\' => \'high\',    
    \'lock\' => WPALCHEMY_LOCK_AFTER_POST_TITLE
));

这是我的gallery\\u meta。php：

<div class="my_meta_control">
 <?php $metabox->the_field(\'attachedGallery\'); ?>
    <label>Attached gallery </label>
    <p>

        <select name="<?php $metabox->the_name(); ?>">
        <option value="0">select gallery</option>       
        <?php
        //global $post;
        $selected = \'selected="selected"\';
        $args = array( \'post_type\' => \'galleries\', \'posts_per_page\' => 999, \'orderby\' => \'title\', \'order\' => \'ASC\' );
        $loop = new WP_Query( $args );
        while ( $loop->have_posts() ) : $loop->the_post();?>
            <option value="<?php the_ID(); ?>" <?php echo $mb->is_value(get_the_ID())? $selected :\'\'; ?>><?php the_title(); ?></option>
        <?php endwhile; wp_reset_query(); ?>
        </select>
    </p>

</div>

对于帖子/页面和事件，输入字段显示在WP admin中。当我保存值时，它似乎无法保存。我检查了mysql数据库，对于我正在测试的这个特定页面，有一行带有：meta\\u key_gallery_metameta\\u值a:1:{s:16:"attached-gallery";s:3:"109";}

我无法检索$gallery\\u元框的值，也无法使select元素将选项标记为选中。有人能帮忙吗？