customization - Outputting posts from post id´s in variable in WordPress

An example:

$posts_ids = array(2,56,87,23,5); // this is an array of posts IDs<?php $my_query = new WP_Query(array('post__in'=>
$posts_ids)); ?>
<?php while ($my_query->
have_posts()) : $my_query->
the_post(); ?>
 <!-- Do stuff... -->
<?php endwhile; ?>