Use two or more loops without duplicate wordpress posts

How to use multiples loops without having the duplicate wordpress posts?

There’s probably many other ways to achieve the same effect.

But here’s a pretty nice way to avoid duplicate posts in two or more loops.

To avoid wordpress post duplication, we started by creating a php array.

And adding the IDs of the posts we get in the first loop to that array:


<h2>Loop NO1</h2>
<?php
$ids = array();
while (have_posts()) : the_post();
the_title();
?>
<br />

<?php $ids[]= $post->ID;
endwhile; ?>


Now, the second loop: we have used the php function in_array() to check out if a post ID is contained in the $ids array. If the IDs isn’t contained in the array, we can display the post as it wasn’t displayed on the first loop.


<h2>Loop NO2</h2>
<?php
query_posts("showposts=10");
while (have_posts()) : the_post();
if (!in_array($post->ID, $ids)) {
the_title();?>
<br />
<?php }
endwhile; ?>


Now no duplicated post.

Alternatively, it is possible to transform the $ids array to a comma separated string and use in along with the exclude parameter of the query_post() function.

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