wp acf relationship loop
<?php
$featured_posts = get_field('featured_posts');
if( $featured_posts ): ?>
<ul>
<?php foreach( $featured_posts as $post ):
// Setup this post for WP functions (variable must be named $post).
setup_postdata($post); ?>
<li>
<a href="<?php the_permalink(); ?>"><?php the_title(); ?></a>
<span>A custom field from this post: <?php the_field( 'field_name' ); ?></span>
</li>
<?php endforeach; ?>
</ul>
<?php
// Reset the global post object so that the rest of the page works correctly.
wp_reset_postdata(); ?>
<?php endif; ?>