Warning adding value session array

Question

i'm developing a shopping cart system and when i try to add a product for the first time it always give me an warning saying the following:

Notice: Undefined index: 2 in .../cart.php on line 9

The index: 2 is the id_product

$product=(isset($_SESSION['cart']) and $_SESSION['cart']!="") ? $_SESSION['cart'] : "";

if(isset($_POST['id_product'])){
        $product= $_POST['id_product'];
        $quantity= $_POST['qty'];
        $_SESSION['cart'][$product]+=$quantity;
    }

It's adding the values eitherway, but after i refresh the page that will appear on my foreach table. The values that i'm receiving are correct.

I'm defining the default values when after i log in on another page.

$_SESSION['car'][0] = 0;

Any suggestion?

Thanks for the support but it's not helping me :/ – André Ferreira Apr 16 '14 at 03:10 — André Ferreira, Apr 16 '14 at 03:10

score 1 · Accepted Answer · answered Apr 16 '14 at 03:16

1

In the statement $_SESSION['cart'][$product]+=$quantity; You are using += and this is what causing the problem.

When you add the product for the first time it will throw error and afterwords work fine.

To solve this do something like this.

$quantity= $_POST['qty'];
if(!empty($_SESSION['cart'][$product])){
     $quantity = $quantity + $_SESSION['cart'][$product];
}
$_SESSION['cart'][$product] = $quantity;

answered Apr 16 '14 at 03:16

Jay Bhatt

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OMG! This couldn't be so obvious! Thank you a lot for your kindness! – André Ferreira Apr 16 '14 at 03:20

score 1 · Answer 2 · answered Apr 16 '14 at 03:18

Hi you need to make your id_product a valid variable,

$product=(isset($_SESSION['cart']) and $_SESSION['cart']!="") ? $_SESSION['cart'] : "";

if(isset($_POST['id_product'])){
    $product= $_POST['id_product'];
    $quantity= $_POST['qty'];

    if(!isset($_SESSION['cart'][$product])) {
        $_SESSION['cart'][$product] = $quantity;
    } 
    else { 
        $_SESSION['cart'][$product]+=$quantity;
    }
}

Warning adding value session array

2 Answers2