Create Random Post WordPress

[thebestsolver.com] I want to display random post in sidebar wordpress without plugin, How to do it ? just copy paste this code and put in your theme wordpress template, in this case, I put the code in sidebar.php

<ul>
<li>
<h2>Random Post of my blog</h2>
<ul>
<?php
$rand_posts = get_posts('numberposts=5&orderby=rand');
foreach( $rand_posts as $post ) :
?>
<li><a href="<?php the_permalink(); ?>">
<?php the_title(); ?>
</a></li>
<?php endforeach; ?>
</ul>
</li>
</ul>