<?
$dom = 'http://localhost/';
?>
<nav>
<ul>
<li>
<a href="/"></a>
</li>
<li>
<a href="<?php echo $dom . 'page/file1/file1.php'; ?>"></a>
</li>
<li>
<a href="<?php echo $dom . 'page/file2/file2.php'; ?>"></a>
</li>
</ul><html>
<head></head>
<body>
<p><?php echo 'Wow, its php!' ?></p>
</body>
</html>