无法在其他控制器中获取会话数据

Question

I'm using symfony 3.4. I'm able to set and get session data within the same controller. But getting the same session data in other controllers throwing an exception : "Call to a member function get() on null".

Below is the code i'm using :

   Controller1.php(Working)
   $this->session = new Session();
   $this->session->start();    
   /*** Set Session Data ***/
   $this->session->set('userid', $dbres [0]['user_id']);

   /*** Get Session Data ***/
   $user_id = $this->session->get('userid');

   Controller2.php(Not Working) 
   /*** Get Session Data ***/
   $user_id = $this->session->get('userid');

   Exception : "Call to a member function get() on null"

Answer 1

Controller1.php(Working)

 $this->session = new Session();
   $this->session->start();    
   /*** Set Session Data ***/
   $this->session->set('userid', $dbres [0]['user_id']);

   /*** Get Session Data ***/
   $user_id = $this->session->get('userid');

Controller2.php(Not Working)

  /*** Get Session Data ***/
   $this->session = new Session();
   $this->session->start();    
   $user_id = $this->session->get('userid');

Exception : "Call to a member function get() on null" Because you have not define $this->session on controller 2