I have a random php code question.

Hi

I am trying to make a link, but I seem to be missing something that I cant quite put my finger on.
This code makes the link clickable on the <p>
I need to make it work on the <h4>

<div class="media-body">
<h4> dfsdfsf <a href="<?Php echo get_option("site_url");
?>/members/<?php echo '' . $current_user->user_login . ''; ?>"</a></h4>
<p> vghdfg </p>
</div>

Thought Id ask in case someone spots what I am missing.

Regards
Mark