remove duplicate id from an array in for loop - php

Question

i have different parameters...on the products...but i want to display only those parameters that are clicked by the user.i have done this but i want to delete the duplicacy.. my code is:-
$ab=$_POST['data1'];
$karan=explode(",",$ab);
array_pop($karan);
for($i=0;$i<count($karan);$i++){
'karan['.$i.'] = '.$karan[$i];
$posts = $wpdb->get_results("SELECT * FROM demo_postmeta WHERE meta_value='".$karan[$i]."' ");
$out=array();
foreach($posts as $post){
if (!isset($out[$post->post_id])){
$out[$post->post_id][$post->meta_key]=$out;
$ram=get_the_post_thumbnail($post->post_id,"_thumbnail_id",true);
$title=get_post_meta($post->post_id,"_product_title",true);
$price=get_post_meta($post->post_id,"_product_year",true);
$link=get_post_meta($post->post_id,"_product_likes",true);
?>
<div id="itemListContent" class="in-list">
<div class="the-list">
<div class="li first row clearfix" style="cursor: pointer;">
<div class="c-1 table-cell">
<div class="cropit">
<a class="pics-lnk important-rule" href="http://uzodocs.com/PROJECTS/demo/products?post_id=<?php echo $post->post_id ?>" style="text-decoration: none;">
<?php echo $ram; ?>
</a>
</div>
</div>
<div class="second-column-container table-cell">
<h3>
<a href="http://uzodocs.com/PROJECTS/demo/products?post_id=<?php echo $post->post_id ?>" title="Kenxinda Watch Mobile Dual SIM with FREE Bluetooth Headset free home delivery - Delhi" class="important-rule" style="text-decoration: none;">
<?php echo $title; ?>
</a>
</h3>
<div class="c-4">
</div>
<span class="itemlistinginfo clearfix">
<span>
Delhi |
Cameras
- Camera Accessories
</span>
<span>
</span>
</span>
</div>
<div class="third-column-container table-cell">
<?php echo $price; ?>
</div>
<div class="fourth-column-container table-cell"><br> </div>
</div>
<div class="li even row clearfix" style="cursor: pointer;">
<div class="c-1 table-cell">
</div>
</div>
</div>
</div>
<?php
}
$out[$post->post_id][$post->meta_key][] = $post->post_id;
}
}
die;
?>

Answer 1

UPDATE:
This may be a way to solve your problem:
if (!in_array($post->post_id, $out)){
$out[] = $post->post_id;
You can remove the last $out[$post->post_id][$post->meta_key][] = $post->post_id;

Answer 2

Just put you required data into
$out[$post->post_id][$post->meta_key][] = "data you need".
and put this array out of for scope. just before die;