如何使用JavaScript for Codeigniter在会话中删除项目？

Question

I am working on a shopping cart php(codeigniter) project. So I have add the item in the session like the code following. The problem is, I would like to remove the item in session in the checkout page.

But of course I can not call the php function to remove the session in javascript , that means , when the remove button is click , how can I do (not restrict to use ajax, simple is the best), I can remove the item in session ? Thanks

   if ($this->form_validation->run()) {
                    if ($this->session->userdata('purchase') !== false)
                        $purchase_list = $this->session->userdata('purchase');
                    else
                        $purchase_list = array();

                    $purchase = array(
                        'id' => $product[0]['id'],
                        'quantity' => $this->input->post('quantity')
                    );

                    if ($this->input->post('opt1') !== false)
                        $purchase['opt1'] = $this->input->post('opt1');

                    if ($this->input->post('opt2') !== false)
                        $purchase['opt2'] = $this->input->post('opt2');

                    array_push($purchase_list, $purchase);
                    $this->session->set_userdata('purchase', $purchase_list);
                    redirect('cart');
                }

Answer 1

from CodeIgniter's session class documentation

This assumes you understand your cart and will know where to actually unset session data in your checkout scenery.

you can set the value of desired item in your session using this syntax:

$this->session->set_userdata('purchase', null); // will set the purchase session data to null

you only know which key to set to null though

Answer 2

You can define a function in your controller to unset the session eg

    class Controllername extends CI_Controller {

    function index(){}

    function reset_session(){
$sesion_variable = 'name_of_session';
    $this->session->unset_userdata($session_variable);
    }

    }

And you can call that via CURL or ajax. On checkout page