setm aximum qty limit on cart in codeigniter code example

Example 1: codeigniter.com cart

$this->cart

Example 2: codeigniter.com cart

$data = array(
        'rowid'  => 'b99ccdf16028f015540f341130b6d8ec',
        'qty'    => 1,
        'price'  => 49.95,
        'coupon' => NULL
);

$this->cart->update($data);