PHP Code Issue

Hi there,

The thing is: when you open a post on my website, on the sidebar are shown some 5 links to other posts of the same category. The problem is: when I have that post in more than one category, 10 posts are printed (sometimes, repeated posts). I would like PHP codex to only print posts from 1 of the categories (doesn’t matter from which one). I am not very much familiar with PHP, but I can see the it is the “foreach” loop that is creating this problem. Can someone offer me some suggestions?

Please check the code:

<?php
if ( is_single() ) :
global $post;
$categories = get_the_category();
foreach ($categories as $category) :
?>

• <h2>Random Articles</h2>
  <ul class=”bullets”>
  <?php
  $posts = get_posts(‘numberposts=5&category=3,4,16’);
  foreach($posts as $post) :
  ?>
• “><?php the_title(); ?>

<?php endforeach; ?>