I am just learning to use objects. I am messing around with a shopping cart
object, but am having confusing problems. I am getting an undefined index
error when trying to assign a key value pair to an array variable within an
object. I am confused becuase I believe this is how you assign array
variables outside an object. It acts like the variable is undefined. Thanks
for the help.
Steve Turner
//--------------------------------------------------
class Cart
{
var $items; // Items in shopping cart
// Add $quantity articles of $product_id to the cart
function add_item ($product_id, $quantity = 1)
{
$this->items[$product_id] += $quantity;
}
// Take $quantity articles of $product_id out of the cart
function remove_item ($product_id, $quantity)
{
if ($this->items[$product_id] > $quantity)
{
$this->items[$product_id] -= $quantity;
return true;
}
else
{
return false;
}
}
}
//I am interacting with the object with the following code
$cart = new Cart;
$cart->add_item("10", 1);
foreach ($cart as $product_id => $quantity)
{
echo $product_id . "<br>" . $quantity;
}
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