Method 1: Using Global Variable

1. Initialize an Array to Store Displayed Post IDsBefore your first loop, initialize an empty array to keep track of the post IDs.

   php

   global $do_not_duplicate;
$do_not_duplicate = array();

2. First LoopIn your first loop, store the post IDs of the displayed posts in the global array.

   php

   <?php
global $do_not_duplicate;
$query1 = new WP_Query(array(
'posts_per_page' => 5,
));if ($query1->have_posts()) :
   while ($query1->have_posts()) : $query1->the_post();
   $do_not_duplicate[] = get_the_ID();
   // Your loop code here
   endwhile;
   wp_reset_postdata();
   endif;
   ?>

3. Second LoopIn your second loop, exclude the post IDs stored in the global array.

   php

   <?php
global $do_not_duplicate;
$query2 = new WP_Query(array(
'posts_per_page' => 5,
'post__not_in' => $do_not_duplicate,
));if ($query2->have_posts()) :
   while ($query2->have_posts()) : $query2->the_post();
   // Your loop code here
   endwhile;
   wp_reset_postdata();
   endif;
   ?>

Method 2: Using Transients for More Complex Scenarios

If you have more complex scenarios or need to persist the exclusion across different parts of your site, you might consider using WordPress transients.

1. Set Up a TransientBefore your loops, check if a transient exists and use it. If not, initialize an empty array.

   php

   $do_not_duplicate = get_transient('excluded_posts') ? get_transient('excluded_posts') : array();

2. First LoopStore the post IDs in the transient after your first loop.

   php

   <?php
$query1 = new WP_Query(array(
'posts_per_page' => 5,
));if ($query1->have_posts()) :
   while ($query1->have_posts()) : $query1->the_post();
   $do_not_duplicate[] = get_the_ID();
   // Your loop code here
   endwhile;
   wp_reset_postdata();
   set_transient(‘excluded_posts’, $do_not_duplicate, HOUR_IN_SECONDS);
   endif;
   ?>

3. Second LoopExclude the post IDs stored in the transient in your second loop.

   php

   <?php
$query2 = new WP_Query(array(
'posts_per_page' => 5,
'post__not_in' => $do_not_duplicate,
));if ($query2->have_posts()) :
   while ($query2->have_posts()) : $query2->the_post();
   // Your loop code here
   endwhile;
   wp_reset_postdata();
   endif;
   ?>

By following these methods, you can avoid displaying the same post in multiple loops on your WordPress site. The first method using a global variable is straightforward and works well for simple use cases. The second method using transients is more suitable for complex scenarios where exclusions need to persist across different parts of the site or for a longer duration.

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These are separate loops, but could contain the same post. For example, your most recent post might also be in the Featured category.

You only want the post to appear once. How do you manage it?

Avoid showing duplicate WordPress posts
The answer is surprisingly simple. Put the following in your functions.php.

<?php
add_filter(‘post_link’, ‘track_displayed_posts’);
add_action(‘pre_get_posts’,’remove_already_displayed_posts’);

$displayed_posts = [];

function track_displayed_posts($url) {
global $displayed_posts;
$displayed_posts[] = get_the_ID();
return $url; // don’t mess with the url
}

function remove_already_displayed_posts($query) {
global $displayed_posts;
$query->set(‘post__not_in’, $displayed_posts);
}

We only want to hide posts which have been displayed already – so we hook into the post_link() function call and make a note of the post we’re displaying.

We then want to hook into any new WordPress query to tell the query to not include any of the posts we’ve already seen. We do this by hooking into the pre_get_posts function and passing it our list of already-displayed posts.

The post Avoid showing same WordPress post in multiple loops appeared first on CNERIS.