WordPress php code in an iframe doesnt work

I have an iframe on sidebar.php, and WordPress php code inside of it does not seem to work. The code looks something like this:

<?php $blog_title =  esc_attr( get_bloginfo( 'name', 'display' ) );
$words = split(' ', $blog_title);
$actor_name = ucwords($words[0] . ' ' . $words[1]); ?>
<li><a href="http://www.domain.com/pics/<?=str_replace(' ', '+', $actor_name)?>" target="_blank"><?=$actor_name?> pic search</a></li>

Is WordPress php code inside an iframe suppose to work with other code outside of this iframe? It looks like it doesnt… Is there any way to get it to work?

Thank you.