cakephp - 未定義の変数: _SESSION [APP\Controller\UsersController.php in cakephp 2.0

Question

Undefined variable: _SESSION [APP\Controller\UsersController.php in cakephp 2.0

Sessionコンポーネントを

UsersController var $components = array('Session', 'Cookie');

コードは次のとおりです。

if(!empty($id))
{               
   print "<br><pre>";       
   print_r($_SESSION['text']);
   print "<br><pre>";
   print_r($this->Session->read("captchatext"));
   die;     
}  
else
{
   $_SESSION['text'] = "jjsssssjj";
   $this->Session->write("captchatext", "ddddddssssssssssdddd");
   print "ddddddssssssssssdddd";
}