php - Symfony2: store and retrieve array in session -

i new symfony2 & using symfony 2.5. following official symfony documentation guidance on session. store , retrive array session, following this official documentation.

problem background

when user logs in , enters website front page, start new session, , store information using following code.

$sessiondata = array(                     'unit' => $unit,                     'client' => $client,                     'group' => $group,                 ); $session = new session(); $session->set('fw', $sessiondata); 

when print_r session info, gives me following output, expected.

array     (         [fw] => array             (                 [unit] => shoes                 [client] => nike                 [group] => north             )     ) 

problem 1

now when want add further data array, follow same symfony documentation given here http://symfony.com/doc/current/components/http_foundation/sessions.html#attributes , following.

$this->get("session")->set('fw/storeid', $storeid);

as per documentation new store id detail should stored in session key=>value pair inside fw array. however, saves is. when print_r , output get.

array     (         [fw] => array             (                 [unit] => shoes                 [client] => bata                 [group] => north             )         [fw/storeid] => abc1     ) 

am doing wrong? there different way store data in array in session?

problem 2

from above session, when want fetch data, docs says. $this->get("session")->get('fw/unit'); . however, gives me undefined index error. once again, correct way fetch data array within session?

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are there mode detailed examples available anywhere?

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as workaround follows , (which docs says can avoid):

$sessiondata = $this->get("session")->get('fw'); $sessiondata['storeid'] = $storeid; $this->get("session")->set('fw', $sessiondata);