<?php

session_start();

if(@$_REQUEST['action'] == 'login')
    $_SESSION['authenticated'] = true;
else if(@$_REQUEST['action'] == 'logout')
    $_SESSION['authenticated'] = false;

$auth = @$_SESSION['authenticated'];
$action = $auth ? 'logout' : 'login';

?>
<a href="?action=<?=$action?>"><?=$action?></a><br>

<?php
if($auth) {
?>
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<?php
}
?>

<hr>
<pre><code><?=htmlentities(file_get_contents(__FILE__))?></code></pre>