2 things...
1st, you have to define your $page_title to be used within the function...
<?php
function title($page_title)
{
//i renamed the var somewhere along the way to see if that was the problem...not sure if this is necessary!!!
$h_page_title = $page_title;
?>
<html>
<head>
<title><?php echo ($h_page_title);?></title>
</head>
</html>
<?php
}
?>
Second, you gotta define your $page_title before you call the title() function...
<?php
include 'include.php';
$page_title = "DFownz";
title($page_title);
echo ($page_title);
?>