Help with function

[kbc1]

Hi all,

I am having trouble with my code so hopefully one of you can help!

My code below adds items to a shopping cart (session variables). The problem I am having is that if I have one item in the cart already and I choose to add 2 more items (as an example), the code doesn't update the session variable to be 3 items in total, it seems to reset the variable and updates to be 2 items instead of 3.

Can anyone identify/highlight the code which is causing me a headache!

	if (!empty($_POST['quantity'])) {
		$quantity = $_POST['quantity'];
		$productid = $_POST['productid'];
		$productprice = $_POST['productprice'];

	$selquantitycount = count($_SESSION['S_SELECTED_QUANTITIES']);

	for ($i = 0; $i <= $quantity; $i++) {
		if ($quantity > 0) {
			$_SESSION['S_SELECTED_PRODUCTS'] = $productid;
			$_SESSION['S_SELECTED_QUANTITIES'] = $quantity;
			$_SESSION['S_SELECTED_PRODUCT_PRICES'] = $productprice;
			$selquantitycount++;
		}
	}
}

$totalordervalue = CalculateOrderValue();  // this is the function shown below...

And here is the CalculateOrderValue function...

function CalculateOrderValue() {

$quantitytotal = 0;
$pricetotal = 0;
$selquantitycount = count($_SESSION['S_SELECTED_PRODUCT_PRICES']);

for ($i = 0; $i <= $selquantitycount; $i++) {
	$quantity = $_SESSION['S_SELECTED_QUANTITIES'];
	$price = $_SESSION['S_SELECTED_PRODUCT_PRICES'];
	$itemprice = number_format($quantity * $price, 2);
	$quantitytotal = number_format($quantity, 0);
	$pricetotal = $itemprice;
}

$totalordercost = $pricetotal;

$_SESSION['S_TEMP_BASKET_QUANTITY'] = $quantitytotal;
$_SESSION['S_BASKET_TOTAL_QUANTITY'] = $quantitytotal;
$_SESSION['S_BASKET_TOTAL_PRICE'] = $totalordercost;

return $totalordercost;
}

Thanks in advance.

[NogDog]

It looks to me like you might want to use a mutli-dimension array to store the order data in the $SESSION array, keyed on the product ID.

if (!empty($_POST['quantity'])) 
{
   $_SESSION['cart'][$_POST['productid'] = array(
      'quantity' => $_POST['quantity'],
      'productprice' => $_POST['productprice']
   );
}

Then, for example, to calculate the total cost:

$totalQuantity = 0;
$totalPrice = 0;
foreach($_SESSION['cart'] as $product)
{
   $totalQuantity += $product['quantity'];
   $totalPrice += $product['quantity'] * $product['productprice'];
}

[kbc1]

Hi

I now have this working great, but when i add 3 or more items to the basket, the overall quantity is calculated incorrectly, however if i add 1 or 2 items only, the overall calculation works fine!

Any suggestions:

	if (!empty($_POST['quantity'])) { 
	    $_SESSION['cart'][$_POST['product']] = array('quantity' => $_POST['quantity'], 'productprice' => $_POST['productprice']); 
		$totalordervalue = CalculateMyOrder();
}

And the function...

function CalculateMyOrder () {

$quantitytotal = 0;
$pricetotal = 0;

foreach($_SESSION['cart'] as $product) {
   $quantitytotal += $product['quantity'];
   $pricetotal += number_format($product['quantity'] * $product['productprice'], 2);
   $newprice += $pricetotal;
}

$totalordercost = $newprice;

$_SESSION['S_TEMP_BASKET_QUANTITY'] = $quantitytotal;
$_SESSION['S_BASKET_TOTAL_QUANTITY'] = $quantitytotal;
$_SESSION['S_BASKET_TOTAL_PRICE'] = $totalordercost;


return $totalordercost;
}

If ayone can offer help as to why i can only add upto 2 items into my cart before that final calculation goes out of control, i would greatlly appreciate it.