PHP Decode

<html> 
<head> 
<!-- This stuff in the header has nothing to do with the level --> 
<link rel="stylesheet" type="text/css" href="http://natas.labs.overthewire.org/css/level.css"> 
<link rel="stylesheet" href="http://natas.labs.overthewire.org/css/jquery-ui.css" /> 
<link rel="stylesheet" href="http://natas.labs.overthewire.org/css/wechall.css" /> 
<script src="http://natas.labs.overthewire.org/js/jquery-1.9.1.js"></script> 
<script src="http://natas.labs.overthewire.org/js/jquery-ui.js"></script> 
<script src=http://natas.labs.overthewire.org/js/wechall-data.js></script><script src="http://natas.labs.overthewire.org/js/wechall.js"></script> 
<script>var wechallinfo = { "level": "natas8", "pass": "<censored>" };</script></head> 
<body> 
<h1>natas8</h1> 
<div id="content"> 
 
<? 
 
$encodedSecret = "3d3d516343746d4d6d6c315669563362"; 
 
function encodeSecret($secret) { 
    return bin2hex(strrev(base64_encode($secret))); 
} 
 
if(array_key_exists("submit", $_POST)) { 
    if(encodeSecret($_POST['secret']) == $encodedSecret) { 
    print "Access granted. The password for natas9 is <censored>"; 
    } else { 
    print "Wrong secret"; 
    } 
} 
?> 
 
<form method=post> 
Input secret: <input name=secret><br> 
<input type=submit name=submit> 
</form> 
 
<div id="viewsource"><a href="index-source.html">View sourcecode</a></div> 
</div> 
</body> 
</html>