cakephp-会话变量一直表现得很奇怪

由于我无法理解的原因,包含客户姓名的会话变量将显示一段时间,然后消失。

在app_controller.php中:before过滤器()

if (isset($_SESSION['customer_name']) == false  || 
    strlen($_SESSION['customer_name']) == 0)
{
  $customer = $this->Customer->read(null, $auth['User']['customer_id']);
  $name = $customer['Customer']['fname'] . " " . $customer['Customer']['lname'];
  $this->Session->write('customer_name', $name);
  $this->set('name', $this->Session->read('customer_name'));
}
else
{
  $this->set('name', $this->Session->read('customer_name'));
}

if ($this->Session->check('customer_name') == false)