Sessionhandler写不起作用？

Question

我使用symfony http-foundation / session在php中进行会话存储。我的问题是下面的代码。

/**
 * Constructor.
 * Make sure your PHP session isn't already started before using the Session class.
 * If you have a legacy session system that starts your session
 * Symfony sessions are designed to replace several native PHP functions.
 * Applications should avoid using session_start(), session_regenerate_id(), session_id(),
 * session_name(), and session_destroy() and instead use the APIs in the following section.
 */
public function __construct()
{
    $storage = new NativeSessionStorage(array(), new NativeFileSessionHandler(application.'/storage/session'));
    $this->session = new Session($storage);
    $this->session->start();

}

会话文件已创建到指定目录。当我使用代码时，但是在设置任何数据时写入过程均不起作用。

/**
 * {@set} .
 * Sets an attribute by key.
 */
public function set($key=null,$value=null)
{
    if($key!==null && $value!==null){
        return $this->session->set($key,$value);
    }
    return false;
}

有什么问题？ 。感谢您的回复。