为typecho博客文章页脚添加"随机文章"和"猜你想看"

<!--随机及相关文章-->
<?php $this->related(3)->to($relatedPosts); ?>
<?php if ($relatedPosts->have()): ?>
<!-- 相关文章 -->
<div class="list-group col-lg-6">
      <span class="list-group-item tt-suiji-title">
        猜你想看
      </span>
    <?php while ($relatedPosts->next()): ?>
        <a class="list-group-item text-ellipsis" href="<?php $relatedPosts->permalink(); ?>" title="<?php $relatedPosts->title(); ?>"><?php $relatedPosts->title(); ?></a>
    <?php endwhile; ?>
</div>
<!--随机文章-->
<div class="list-group col-lg-6">
      <span class="list-group-item tt-suiji-title">
        随机文章
      </span>
      <?php getRandomPosts(3);?>
</div>
<?php else: ?>
<!--随机文章-->
<div class="list-group">
      <span class="list-group-item tt-suiji-title">
        随机文章
      </span>
      <?php getRandomPosts(3);?>
</div>
<?php endif; ?>
<!--随机及相关文章  End-->

    /**
     * 随机文章，在需要添加随机文章的地方加上代码：<?php getRandomPosts(5);?>
     * 数字5为要调用的文章数量。
     */
    function getRandomPosts($random)
    {
        $modified = $random->modified;
        $db = Typecho_Db::get();
        $adapterName = $db->getAdapterName();//兼容非MySQL数据库
        if ($adapterName == 'pgsql' || $adapterName == 'Pdo_Pgsql' || $adapterName == 'Pdo_SQLite' || $adapterName == 'SQLite') {
            $order_by = 'RANDOM()';
        } else {
            $order_by = 'RAND()';
        }
        $sql = $db->select()->from('table.contents')
            ->where('status = ?', 'publish')
            ->where('table.contents.created <= ?', time())
            ->where('type = ?', 'post')
            ->limit($random)
            ->order($order_by);

        $result = $db->fetchAll($sql);
        foreach ($result as $val) {
            $val = Typecho_Widget::widget('Widget_Abstract_Contents')->push($val);
            echo '<a class="list-group-item text-ellipsis" href="' . $val['permalink'] . '" title="' . $val['title'] . '"> ' . $val['title'] . ' </a>';
        }
    }