How do I update Cart Options using Codeigniter 2x Cart Library?

I search through documents provided by Codeigniter for updating cart options value, but it only mention updating Cart value not option value.


I tried to update something like this.

Code:

           foreach ($this->input->post() as $key => $value) {
                 $data = array(
                   'rowid' => $key,
                   'options' => array('color' => 'red', 'size' => 'xl')
                );

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

            }

But didn't work out. I googled it but none of them worked for me.