Avoid Duplicate Posts in Multiple Loops

Do you want to create a simple PHP array and put post IDs from the first loop in it? While there’s probably a plugin for this, we have created a quick code snippet that you can use to check if post ID is contained in the $ids array and avoid duplicate posts in multiple loops in WordPress.

Instructions:

All you have to do is add this code to your theme’s post.php or single.php file:

<h2>Loop n°1</h2>
<?php
$ids = array();
while (have_posts()) : the_post();
the_title();
?>
<?php $ids[]= $post->ID;
endwhile; ?>

<h2>Loop n°2</h2>
<?php
query_posts("showposts=50");
while (have_posts()) : the_post();
if (!in_array($post->ID, $ids)) {
  the_title();?>
<?php }
endwhile; ?>

Note: If this is your first time adding code snippets in WordPress, then please refer to our guide on how to properly add code snippets in WordPress, so you don’t accidentally break your site.

If you liked this code snippet, please consider checking out our other articles on the site like: 15 best content marketing tools for WordPress and how to create a contact form in WordPress.