如何在codeigniter中的会话中存储zend访问对象

Question

我正在尝试将Zend日历库访问对象（即“服务”）存储在codeigniter控制器中，该控制器可以在控制器内的任何功能中访问以供将来使用。我试图将它存储在一个类变量中，并将其作为“$ this-＆gt; service”访问，但该对象返回为空。下一个技术是将对象存储在session中，该对象也返回一个空变量。我编写的对象的会话存储代码如下：

我的控制器：

class calendar extends CI_Controller {

    function __construct(){
        parent::__construct();

        $clientPath = APPPATH."libraries";
        $oldPath = set_include_path(get_include_path() . PATH_SEPARATOR . $clientPath);

        require_once 'Zend/Loader.php';
        Zend_Loader::loadClass('Zend_Gdata');
        Zend_Loader::loadClass('Zend_Gdata_ClientLogin');
        Zend_Loader::loadClass('Zend_Gdata_Calendar');

    }

    public function connect_with_google(){

        // User whose calendars you want to access
        $user = 'email@email.com';
        $pass = 'mypassword';
        $service = Zend_Gdata_Calendar::AUTH_SERVICE_NAME; // predefined service name for calendar
        $client = Zend_Gdata_ClientLogin::getHttpClient($user, $pass, $service);
        $service = new Zend_Gdata_Calendar($client);
        $this->session->set_userdata('service', $service);

    }

    public function ajax_get_calendars()
    {
      var_dump($this->session->userdata('service'));
    }
}

/* End of file welcome.php */
/* Location: ./application/controllers/welcome.php */