How to add to value in array

Question

I am trying to increase quantity of a product when the id of that product already exists inside an array.

My product array $arr2 looks like this for example:

Array
(
    [productid] => 3
    [productname] => Eikenhout pallet
    [productalias] => eikenhout-pallet
    [productcat] => Eikenhout
    [catalias] => eikenhout
    [quantity] => 1
    [kuubkosten] => 150|1 kuub
)

Then I create a session and add all information to it.

if (!isset($_SESSION['cart'])) {
     // and turn session into array
   $_SESSION['producten'] = array();
}

// If id of product does not exist, add it to session
if(!isset($_SESSION['producten'][$arr2['productid']])){
    $_SESSION['producten'][$arr2['productid']] = $arr2;
// Else add to quantity
}else{
    $_SESSION['producten'][$arr2['productid']]['quantity'] += $arr2['quantity'];
}

If I then print my session, this is what I get:

Array
(
    [3] => Array
        (
            [productid] => 3
            [productname] => Eikenhout pallet
            [productalias] => eikenhout-pallet
            [productcat] => Eikenhout
            [catalias] => eikenhout
            [quantity] => 1
            [kuubkosten] => 150|1 kuub
        )

)

But after adding the product again, the quantity is not increased. What am I doing wrong? I can see in my network tab that all data is correctly posted and there are no errors.

+= $arr2['quantity'] should be $arr2['quantity']+1; maybe — devpro
– devpro, Commented Feb 4, 2019 at 15:44
@devpro But what if in the future I want customers to be able to add any quantity at once? For example add 10 products in one click? — twan
– twan, Commented Feb 4, 2019 at 15:46
If you are truely doing this $_SESSION['producten'][$arr2['productid']] = $arr2; then WHERE in the session array is producten — RiggsFolly
– RiggsFolly, Commented Feb 4, 2019 at 15:46
@RiggsFolly That is the name of my session. Printing $_SESSION['producten'] shows me the second array in my question. — twan
– twan, Commented Feb 4, 2019 at 15:48

Aaron Stein · Accepted Answer · 2019-02-04 18:45:34Z

1

As devpro already said, you are checking if the key 'cart' isset

if (!isset($_SESSION['cart'])) {

But you are never setting that variable. Your code might just work when you change

if (!isset($_SESSION['cart'])) {
    // and turn session into array
    $_SESSION['producten'] = array();
}

to

if (!isset($_SESSION['producten'])) {
    // and turn session into array
    $_SESSION['producten'] = array();
}

answered Feb 4, 2019 at 18:45

Aaron Stein

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