How to append array value in magento session?

Question

Just I want to append array value in magento session data

    Mage::getSingleton( 'core/session' )->setData( 'createArrayDefault', array(3));
    Mage::getSingleton( 'core/session' )->setData( 'createArrayDefault', array(2));

print_r(Mage::getSingleton( 'core/session' )->getData('createArrayDefault'));

It displays array(0=>2) and override 3value from array
But I want this array(0=>2,0=>3);

When I print magento session data and print,it overrides array 3 value but I want both values in session data.How to append values in session data.

Answer 1

Setting data to your session:

$session = Mage::getSingleton('core/session');
$session->setData('createArrayDefault', array(3));

If you need later append values to that session data array:

$data = $session->getData('createArrayDefault'); 
$session->setData(array_merge(array(3), $data));