Magento storing in session

$storage = array('a'=>'b');

// store data so we can fetch it in subtotal methods
Mage::getSingleton('core/session')->setRbanhShipping(serialize($storage));

// get data
$rbanhShipping = Mage::getSingleton('core/session')->getRbanhShipping(); 
$rbanhShipping = unserialize($rbanhShipping);

CMS Made Simple Session Problem – Admin Panel Login Page shows while browsing Image Manager (Backend)

Create a ‘session’ directory(/var/www/vhosts/xyz.com.au/httpdocs/session) and give 777 permission.
config.php:
session_save_path(“/var/www/vhosts/xyz.com.au/httpdocs/session”);
ini_set(‘session.gc_probability’, 1);

admin/index.php: (at the top)
session_save_path(“/var/www/vhosts/xyz.com.au/httpdocs/session”);
require_once(“../include.php”);

include.php:
session_save_path(“/var/www/vhosts/xyz.com.au/httpdocs/session”);