将Zend_Auth存储后端$_SESSION更改为Memcached

我正在尝试更改Zend_Auth的会话后端。但没能成功。在我的bootstrap.php中；

    $oBackend = new Zend_Cache_Backend_Libmemcached(
        array(
            'servers' => $servers,
            'compression' => false
    ) );
    // configure caching frontend strategy
    $oFrontend = new Zend_Cache_Core(
        array(
            'caching' => true,
            'automatic_serialization' => true
        ) );
    // build a caching object
    $cache = Zend_Cache::factory( $oFrontend, $oBackend );
    $saveHandler = new 'Application'Auth'Adapter'Memcached();
    $saveHandler->setCacher($cache);
    'Zend_Session::setSaveHandler($saveHandler);

它成功地保存了值Memcache，没有任何问题。我测试它；

    $namespace = new Zend_Session_Namespace();
    $namespace->name = "Fatih";

在其他控制器中；

    $ns = new Zend_Session_Namespace();
    var_dump($ns->name);

可以，但我在Memcache中看不到Zend_Auth值。但是如果我var_dump($_SESSION)我可以看到它像；

["Zend_Auth"]=> array(1) { ["storage"]=> object(Application_Security_Auth_Storage)#66 (1) { ["_user":protected]=> object(Application_Security_Auth_User)#84 (4) { ["id":protected]=> object(MongoId)#87 (1) { ["$id"]=> string(24) "4fcca6b8c863c79d33000004" } ["username":protected]=> string(5) "admin" ["role":protected]=> string(5) "admin" ["fullname":protected]=> NULL } } }

在这里你可以看到我的登录方法；

public function login($username, $password)
{
    if ($username == "" || $password == "")
        return false;
    $adapter = new 'Application_Security_Auth_Adapter();
    $adapter->setIdentity($username);
    $adapter->setCredential($password);
    $auth = 'Zend_Auth::getInstance();
    $result = $auth->authenticate($adapter);
    return $result->isValid();
}