Usage of get_crp_posts_id

Hello,

Whould you please post the example how to extract ids of related posts from get_crp_posts_id. I’m newbee to objects, I tried this code but it doesn’t work.

$post_id = "384878";
$rel_posts = get_crp_posts_id($post_id, 5);

foreach ($rel_posts->result_array() as $rel_post_id)
{
 echo $rel_post_id[0];
}