I found this code that I customized (@tom unsborne) as I wanted. How to include category exclusion. I only want the category related to the article in the next and previous article function. If possible have something dynamic. Examples of articles from such categories I find only articles from the same category. A snippet for the whole site. If this is possible please
<div id="post-nav">
<ul class="flex">
<?php global $post;
$prevPost = get_previous_post(false);
$post_type = get_post_type();
if($prevPost) {
$args = array(
'posts_per_page' => 1,
'include' => $prevPost->ID,
'post_type' => $post_type,
);
$prevPost = get_posts($args);
foreach ($prevPost as $post) {
setup_postdata($post);
?>
<li>
<a class="post-previous" href="<?php the_permalink(); ?>" rel="prev">
<strong><?php the_title(); ?></strong><span>Mariage précédent</span>
</a>
</li>
<?php
wp_reset_postdata();
} //end foreach
} // end if
$nextPost = get_next_post(false);
if($nextPost) {
$args = array(
'posts_per_page' => 1,
'include' => $nextPost->ID,
'post_type' => $post_type,
);
$nextPost = get_posts($args);
foreach ($nextPost as $post) {
setup_postdata($post);
?>
<li>
<a class="post-next" href="<?php the_permalink(); ?>" rel="next">
<strong><?php the_title(); ?></strong><span>Mariage suivant</span>
</a>
</li>
<?php
wp_reset_postdata();
} //end foreach
} // end if
?>
</ul>
</div>