How to increment the session array value?

Question

I am using this on a shopping cart

if (!empty($_getvars['id'])) {
    $data = $session->get('cart');
    $data[] = $_getvars['id'];
    $session->set('cart', $data);
}

$_getvars['id'] is productid, and on each click, a new array element will be added to the session. It works fine as it is now, but if a product is chosen more than once a new array will be added, how can change it that productid will be array offset and the value will be incremented from 1 each time to reflect the quantity?

$i = 1;
if (!empty($_getvars['id'])) {
    $data = $session->get('cart');
    $data[$_getvars['id']] = $i++;
    $session->set('cart', $data);
}

but this code each time resets to 1. How to fix it? Or any better array structure for a shopping cart?

Arleigh Hix · Accepted Answer · 2019-10-23 17:01:00Z

1

If it's not set, set it to zero, then always add one.

if (!empty($_getvars['id'])) {
    $data = $session->get('cart');
    if(!isset($data[$_getvars['id']]){
        $data[$_getvars['id']] = 0;
    }
    $data[$_getvars['id']] += 1;
    $session->set('cart', $data);
}

Or you could add a dynamic quantity

if (!empty($_getvars['id'])) {
    $data = $session->get('cart');
    if(!isset($data[$_getvars['id']]){
        $data[$_getvars['id']] = 0;
    }
    // $_GET['qty'] OR 1, if not set
    $qty = (!empty($_getvars['qty']))? $_getvars['qty']: 1;
    $data[$_getvars['id']] += $qty;
    $session->set('cart', $data);
}

answered Oct 23, 2019 at 17:01

Arleigh Hix

11k1 gold badge17 silver badges38 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

user4271704 Over a year ago

Thanks a lot for your time. Please see stackoverflow.com/questions/58528052/… @Arleigh Hix

Collectives™ on Stack Overflow

How to increment the session array value?

1 Answer 1

1 Comment

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

1 Comment

Your Answer

Sign up or log in

Post as a guest

Linked

Related