请问话题如何实现类SF那样的集合，也就是话题按根分组排列？？？
类似以下效果！
PS:
这只能显示根话题，<?php if ($this->data_list[$parent_info['topic_id']]) { ?>这句有问题没？
<?php if ($this->parent_list) { ?>
<div class="mod-body clearfix">
<?php foreach ($this->parent_list AS $parent_info) { ?>
<div class="col-sm-4 col-md-4">
<div class="wd-item">
<h3><?php echo $parent_info['topic_title']; ?></h3>
<?php if ($this->data_list[$parent_info['topic_id']]) { ?>
<ul>
<?php foreach ($this->data_list[$parent_info['topic_id']] AS $data_info) { ?>
<li><a href="topic/<?php echo $data_info['url_token']; ?>" data-id="<?php echo $data_info['topic_id']; ?>" class="text"><?php echo $data_info['topic_title']; ?></a></li>
<?php } ?>
</ul>
<?php } ?>
</div>
</div>
<?php } ?>
</div>
<?php } ?>
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