PHP shopping carts and Key Value Pairs

I am attempting to create a PHP shopping cart using a session. Below is the code I have so far for adding to the cart.

session_start();
$cart = $_SESSION['cart'];
$cart[sizeof($cart)+1] = $_GET['pid'] ;
$_SESSION['cart'] = $cart;

I want to store the quantity ordered as a key value pair in the array. I have tried this using the below code, without any luck. How do I do this?

$cart[sizeof($cart)+1] = ($_GET['pid'] => $_GET['quantity']);

Many Thanks
inghfsAsked:
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glcumminsCommented:
Rather than creating the intermediary variable, you can create the new key directly in the cart $_SESSION array:

$_SESSION['cart'][$_GET['pid']] = $_GET['quantity'];
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