How to get post id in template??

If I understand your question correctly, you can use the get_user_favorites function to fetch the current user’s favorites. It returns an array of post IDs they have favorited.

Could you show me in detail??
I try like this.

<?php while ( have_posts() ) : the_post(); ?>
<?php echo get_user_favorites($user_id, $site_id); ?>
<?php endwhile; ?>

<?php echo get_user_favorites(); ?> …how to use it??
I just want to print 13457284…like this ‘post id’

When I just use <?php echo get_user_favorites($user_id, $site_id); ?>,
I only get “array” value.

I’ve done.
It only worked in method 2