我需要生成上传到特定页面的附件列表（id=628）。我原以为这段代码会起作用，但它根本不会生成任何东西：

<?php
get_header(); ?>

<div id="container">
    <div id="content" role="main">
        <?php
            $attachments =& get_children( array (
                \'post_parent\' => 628,
                \'post_type\' => \'attachment\'
            ));

            if ( empty($attachments) ) {
                // no attachments here
            } else {
                foreach ( $attachments as $attachment_id => $attachment ) {
                    echo wp_get_attachment_link( $attachment_id );
                }
            }
        ?>
    </div><!-- #content -->
</div><!-- #container -->

<?php get_sidebar(); ?>
<?php get_footer(); ?>