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This is a simple example on using SimpleCAS to secure a page:

<?php
require_once 'SimpleCAS/Autoload.php';
require_once 'HTTP/Request2.php';

$options = array('hostname' => 'login.unl.edu',
                 'port'     => 443,
                 'uri'      => 'cas');
$protocol = new SimpleCAS_Protocol_Version2($options);

$client = SimpleCAS::client($protocol);
$client->forceAuthentication();

if (isset($_GET['logout'])) {
	$client->logout();
}

if ($client->isAuthenticated()) {
    echo '<h1>Authentication Successful!</h1>';
    echo '<p>The user\'s login is '.$client->getUsername().'</p>';
}
?>
<a href="?logout">Logout</a>