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I am attempting to add a product to my cart using an increment. It works, however, when I add the first of any product, it gives me the following errors:

 

Notice: Undefined index: cart in C:\wamp\www\cart.php on line 36

Notice: Undefined offset: 41 in C:\wamp\www\cart.php on line 36

 

Once the quantity increases above 1, there are no errors. Unsure what is going on.

 

switch($action) {

case "add":
$_SESSION['cart'][$product_id]++;
break;

case "remove":
if (isset($_SESSION['cart'][$product_id])) {
$_SESSION['cart'][$product_id]--;}
if($_SESSION['cart'][$product_id] == 0) unset($_SESSION['cart'][$product_id]);
break;
}

 

Line 36 is:

 

$_SESSION['cart'][$product_id]++;

Edited by Accolade
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https://forums.phpfreaks.com/topic/270307-notice-undefined-index-undefined-offset/
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