在会话中从购物车中删除项目 | 代码点火器

Question

I have items in my cart with session and I want to remove the item, my nested array is as follows,

[cart_items] => Array
        (
            [0] => Array
                (
                    [item_id] => 1
                    [item_name] => Neapolitan Pizza
                    [price] => 750.00
                    [toppings] => Array
                        (
                            [0] => Array
                                (
                                    [id] => 3
                                    [name] => Chilli
                                    [price] => 100.00
                                )

                            [1] => Array
                                (
                                    [id] => 4
                                    [name] => Green chilli 
                                    [price] => 100.00
                                )

                        )

                    [quantity] => 1
                    [price_per_item] => 750
                )

            [1] => Array
                (
                    [item_id] => 16
                    [item_name] => Cheesy Garlic Bread
                    [price] => 420.00
                    [quantity] => 1
                    [price_per_item] => 420
                )

        )

Controller Code:-

In my controller, I have created the following function to remove each item . what am I missing here?

/Cart/remove

public function remove($id){
        $this->load->library('session');
        $list = $this->session->userdata('cart_items');
        if($list){
            foreach ($list as $item=>$value){
                if($id==$value['item_id']){
                    $this->session->unset_userdata($value);
                }
            }
        }
        redirect('Cart/index');

    }

In my view, this is how I pass the item id in the anchor tag.

View:-

<?php $list = $this->session->userdata('cart_items');
        $grand_total=0;
        if($list==Null) {
            print_r("<div><li class='list-group-item d-flex justify-content-between lh-condensed'>There are no items in the your cart</li></div>");
            $sub_total=0;
        }else{
            $sub_total=0;
            foreach ($list as $item=>$value){
                echo "<li class='list-group-item d-flex justify-content-between lh-condensed'>";
                if($value['item_id']<16) {

                    print_r("<div>" . $value['item_id'] . "</div>");
                    print_r("<div>" . $value['item_name'] . "</div>");
                    print_r("<div>" . $value['price'] . "</div>");

                    // toppings array is empty 
                    $toppings_price = 0;
                    if ($value['toppings'] == null) {
                        print_r("<div>No toppings selected</div>");
                    } else {
                        foreach ($value['toppings'] as $val) {
                            // printing topping names
                            print_r("");
                            print_r($val['name']);
                            print_r(",");
                            $toppings_price = $toppings_price + $val['price'];
                        }
                    }

                }else{
                    print_r("<div>" . $value['item_id'] . "</div>");
                    print_r("<div>" . $value['item_name'] . "</div>");
                    print_r("<div>" . $value['price'] . "</div>");
                }

                print_r("<div>".$value['quantity']."</div>");
                print_r("<div><a href='".base_url()."index.php/Cart/remove/".$value['item_id']."' class='btn btn-danger'>Remove</a></div>");
                echo "</li>";

                //sub total
                if($value['item_id']<16){
                    $sub_total+=($value['price']*$value['quantity'])+$toppings_price;
                }else{
                    $sub_total+=($value['price']*$value['quantity']);
                }
            }
        }
        $grand_total = $sub_total;
        ?>

When i clicked on the "remove" button it loads to the same page but item row doesn't get removed.

Answer 1

public function remove($id){
        $this->load->library('session');
        $list = $this->session->userdata('cart_items');
        if($list){
            foreach ($list as $item=>$value){
                if($id==$value['item_id']){
                    $this->session->unset_userdata($value['item_id']);
                }
            }
        }
        redirect('Cart/index');

    }

View Code:-

<td>
<a href="<?= base_url().'user/remove/'.$value['item_id']; ?>">
  <button>REMOVE</button>
</a>
</td>

destroy or unset the value of the session?

 $this->session->unset_userdata('some_name');

and for multiple data you can:-

$array_items = array('username' => '', 'email' => '');

$this->session->unset_userdata($array_items);

and to destroy the session:-

$this->session->sess_destroy();

Note:- For more information about Session Class in Codeigniter,

https://codeigniter.com/userguide3/libraries/sessions.html

Answer 2

That's because your userdata is not the values themselves but the array containing them. You need to remove the item from the array and then save the array as the new userdata. Try something like this:

public function remove($id){
  $this->load->library('session');
  $list = $this->session->userdata('cart_items');

  if($list){
    foreach ($list as $item=>$value){
      if($id==$value['item_id']){
        unset($list[$item]);
        $list = array_values($list); // optional, reindex the array.
        break;
      }
    }

    $this->session->set_userdata('cart_items', $list);
  }

  redirect('Cart/index');

}