wordpress评论模板回调函数的使用

<?php
    if (!empty($_SERVER['SCRIPT_FILENAME']) && 'comments.php' == basename($_SERVER['SCRIPT_FILENAME']))
        die ('请勿直接加载此页。谢谢！');
    if ( post_password_required() ) { ?>
        <p class="nocomments"><?php _e('必须输入密码，才能查看评论！'); ?></p>
    <?php
        return;
    }
?>
<?php if ('open' == $post->comment_status) : ?>
<div id="postcomments">
    <div id="comments">
    <?php if ('open' == $post->comment_status) : ?>
    <div id="respond_box">
        <div id="respond">
            <div class="cancel-comment-reply">
                <small><?php cancel_comment_reply_link(); ?></small>
            </div>
            <?php if ( get_option('comment_registration') && !$user_ID ) : ?>
            <p><?php print '您必须'; ?><a href="<?php echo get_option('siteurl'); ?>/wp-login.php?redirect_to=<?php echo urlencode(get_permalink()); ?>"> [ 登录 ] </a>才能发表留言！</p>
            <?php else : ?>
            <form action="<?php echo get_option('siteurl'); ?>/wp-comments-post.php" method="post" id="commentform">
            <?php if ( $user_ID ) : ?>
                <div class="comment_current">你好，<a href="<?php echo get_option('siteurl'); ?>/wp-admin/profile.php"><?php echo $user_identity; ?></a>！  <a href="<?php echo wp_logout_url(get_permalink()); ?>" title="退出" class="logout"><?php print '[ 退出 ]'; ?></a></div>
            <?php elseif ( '' != $comment_author ): ?>
                <div class="author"><?php printf(__('欢迎回来 <strong>%s</strong>'), $comment_author); ?><a href="javascript:toggleCommentAuthorInfo();" id="toggle-comment-author-info">[ 更改 ]</a></div>
            <?php endif; ?>
            <?php if ( ! $user_ID ): ?>
                <div id="comment-author-info" class="comment_info">
                    <li>
                        <label for="author"><small><i class="fa fa-user"></i></small></label>
                        <input type="text" name="author" id="author" class="commenttext" placeholder="Name"  value="<?php echo $comment_author; ?>" size="22" tabindex="1" placeholder="Name" />
                    </li>
                    <li>
                        <label for="email"><small><i class="fa fa-envelope"></i></small></label>
                        <input type="text" name="email" id="email" class="commenttext" value="<?php echo $comment_author_email; ?>" size="22" placeholder="Email" tabindex="2" />
                    </li>
                    <li>
                        <label for="url"><small><i class="fa fa-globe"></i></small></label>
                        <input type="text" name="url" id="url" class="commenttext" value="<?php echo $comment_author_url; ?>" size="22"placeholder="http://"  tabindex="3" />
                    </li>
                </div>
            <?php endif; ?>
                <div class="clear"></div>
                <textarea name="comment" id="comment" class="textarea" tabindex="4" cols="50" rows="5"></textarea>
                <div class="respond-status">
                    <div id="loading" class="loading"><i class="fa fa-spinner fa-spin"></i>&nbsp;&nbsp;正在提交中，请稍候...</div>
                    <div id="error" class="warning"></div>
                    <div id="success" class="success"><i class="fa fa-check"></i>&nbsp;&nbsp;评论提交成功</div>
                    <div id="replying" class="info">回复 <strong id="replying-parent"></strong> 的评论,点击取消回复。</div>
                </div>
                <input class="submit" name="submit" type="submit" id="submit" tabindex="5" value="发表评论" />
                <?php comment_id_fields(); ?>
                <span class="smiles-icons tooltip" title="表情"><i class="fa fa-smile-o fa-2x"></i></span>
                <?php do_action('comment_form', $post->ID); ?>
            </form>
            <div class="clear"></div>
            <?php endif; // If registration required and not logged in ?>
        </div>
    </div>
    <?php else : // comments are closed ?>
    <!-- If comments are closed. -->
        <p class="nocomments">报歉!评论已关闭.</p>
    <?php endif; ?>
    <?php if ($comments) : ?>
        <h3 id="comments" class="comments_list_title"><?php comments_number('', '1 COMMENT', '% COMMENTS' );?></h3>
        <ol class="comment-list">
        <?php wp_list_comments('type=comment&callback=mytheme_comment&end-callback=mytheme_end_comment&max_depth=23'); ?>
        </ol>
        <div class="pagination"><?php paginate_comments_links(array(
    'prev_text' => '&lt;',
    'next_text' => '&gt;'
    )); ?></div>
    <?php else :?>
    <?php endif;?>
    </div>
</div>
<?php endif;?>

// 评论回复
<?php
function mytheme_comment($comment, $args, $depth) {
    $GLOBALS['comment'] = $comment;
?>
<li id="comment-<?php comment_ID() ?>" class="comment-body">
   <div id="div-comment-<?php comment_ID() ?>" class="comment-main">
      <?php $add_below = 'div-comment'; ?>
        <div class="comment-author vcard">
<?php
echo get_avatar( $comment, 50 );?>
<cite class="fn"><?php comment_author_link() ?></cite><span class="datetime"><?php comment_date('Y-m-d') ?>  <?php comment_time() ?></span><?php edit_comment_link('[编辑]','&nbsp;&nbsp;',''); ?></div>
        <?php if ( $comment->comment_approved == '0' ) : ?>
            <span style="color:#C00; font-style:inherit">您的评论正在等待审核中...</span>
            <br />
        <?php endif; ?>
            <?php comment_text() ?>
 <div class="comment-reply"><?php comment_reply_link(array_merge( $args, array('reply_text' => '[ 回复 ]', 'add_below' =>$add_below, 'depth' => $depth, 'max_depth' => $args['max_depth']))); ?></div>
  </div>
<?php
}
function mytheme_end_comment() {
        echo '</li>';
}