CI Session Array Problem

[eluser]mohsin917[/eluser]
Hi.
This is the thing that i do in simple code. Every time when this code runs it create new index of basket in session array and when i want to get data i just do it with simple loop.
Now i want to do it in CI using session class

Code:

$product_array = array(
                       "id"            => $id,
                       "pName"         => $_POST['pName'],
                       "pImage"     => $_POST['pImage'],
                       "pCode"         => $_POST['pCode'],
                       "price1"        => $_POST['price1'],
                       "price2"        => $_POST['price2'],
                       "price3"        => $_POST['price3'],
                       "price4"     => $_POST['price4'],
                       "quantity"    => 1
                       );
    $_SESSION['basket'][] = $product_array;

simply array is working in CI Session class. But can't add the session auto incremented array. Even i also try to do this.

Code:

$basket[] = array(
                       "id"            => '1',
                       "pName"         => "name",
                       "quantity"    => 1
                       );
                      
        $this->session->set_userdata($basket);

but not helpful.

Any idea??