Check duplicate data in CodeIgniter result - codeigniter

Question

I have a small forum and want to show the last 10 reply's.
My problem:
I get some duplicate entries from the database because there have some replies in one post. How I can disable all duplicate posts and show only one from all posts. I try to say, if more then 1 replys with the same forum_post_id > show only the last.
My View:
<?php foreach ($forum_reply as $item): ?>
<?php $standing = $item->forum_post_id ?>
<div class="col-lg-12 robie" onClick="location.href='<?= site_url('viewtopic/index/' . $item->forum_post_id) ?>'">
<div class="catcenter55 row">
<div class="col-md-3 deta grew">
<?php echo $this->db->where('forum_post_id', $item->forum_post_id)->get('forum_post')->row()->post_head; ?>
</div>
<div class="col-md-2 deta">
<?php $topcat = $this->db->where('forum_post_id', $item->forum_post_id)->get('forum_post')->row()->forum_cat_id ;?>
<?php echo $this->db->where('forum_cats2_id', $topcat)->get('forum_cats2')->row()->forum_name; ?>
</div>
<div class="col-md-2 deta">
<?php echo $this->db->where('forum_post_id', $item->forum_post_id)->get('forum_post')->row()->views; ?>
</div>
<div class="col-md-2 deta">
<div class="likebg2">+<?php echo $this->db->where('forum_post_id', $item->forum_post_id)->get('forum_post')->row()->likes; ?></div>
</div>
<div class="col-md-3 deta">
<?php foreach ($this->db->order_by('timestamp', 'DESC')->get('forum_reply')->result() as $stan): ?>
<?php if($standing == $stan->forum_post_id): ?>
<?php echo $this->db->where('user_id', $stan->user_id)->get('users')->row()->username; ?> | <?php echo $this->db->order_by('timestamp', 'DESC')->where('forum_reply_id', $stan->forum_reply_id)->get('forum_reply')->row()->timestamp; ?>
<?php break; ?>
<?php endif; ?>
<?php endforeach; ?>
</div>
</div>
</div>
<?php endforeach; ?>
My Controller
public function index() {
$data['forum_reply'] = $this->db->get('forum_reply')->result();
}
My result

Answer 1

Managed to get what I think you are trying to achieve by using a group by i.e.
SELECT * FROM posts GROUP BY forumId;
However this makes things more complicated when ordering the posts, this is a bit hacky but have a look at this:
SELECT *
FROM (
SELECT *
FROM posts
ORDER BY date DESC
LIMIT 18446744073709551615
) AS sub
GROUP BY sub.forumId
ORDER BY id DESC
For reference regarding the sub query look at this previous question and this post

Answer 2

Thank you Jake,
I was change
$data['forum_reply'] = $this->db->get('forum_reply')->result();
to
$data['forum_reply'] = $this->db->group_by('forum_post_id')->order_by('timestamp', 'DESC')->get('forum_reply')->result();
and it´s working.