sess_expire_on_close

I want to override or set config item dynamically. If user logged in without checking remember me checkbox then I want to set sess_expire_on_close value is false and user not checked then sess_expire_on_close value is true. I used the following php code: 

PHP Code:

if($this->input->post('remember')) 
$this->config->set_item('sess_expire_on_close', '0');
else
$this->config->set_item('sess_expire_on_close', '1'); 


but this process is not working. When I closed then browser without checking remember me dialog then session expire value is set to be 0 but still session is live. If a set config the following value 

PHP Code:

$config['sess_expire_on_close'] = TRUE; --> config.php 


then session will be destroy when closed browser but not store session value when I checked remember me checkbox. 






rollyHello everyone...
I know, what in 3 version this param sess_expire_on_close was delete.
How remove session after close browser?
Okay. I know if set config sess_expiration = 0 session close ...

but if I make

PHP Code:

$this->config->set_item('sess_expiration', 0);
$this->load->library('session'); 


not work, load only 

PHP Code:

$config['sess_expiration'] = 600; --> config.php 


config.php



but when I show var_dump($this->config->item('sess_expiration')); I see = 0, but if I close browser and open again session live..., if I change sess_expiration = 0 in config.php file - session die after close browser.