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osCommerce: How to Limit a Products Quantity in Cart

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I have a magazine site and to make life easier I wanted to only allow customers to order 2 years for their subscription. I found a contribution that added in admin support and lets you vary the amount per product. I just did not need that level of control. I want to limit you to two years, no matter what product. Here’s what I did to do this in the osCommerce shopping cart.

First, find this code in shopping_cart.php:

if (STOCK_CHECK == 'true') {
$stock_check = tep_check_stock($products[$i]['id'], $products[$i]['quantity']);
if (tep_not_null($stock_check)) {
$any_out_of_stock = 1;

$products_name .= $stock_check;
}
}


After that code add this code in:


if ($products[$i]['quantity'] > 2) {
$products_name .= " - Too many years ordered, Maximum of 2 Years“;
$products[$i][’quantity’] = “2″;
$cart->remove($products[$i][’id’]); // remove this new item from the cart session
$cart->add_cart($products[$i][’id’],2,$products[$i][’attributes’]); // update the qty
}


As you can see I have hard coded two years and also the text that is displayed. To change the amount simply change the three occurrences of 2 in my sample code.

I hope this is of help to others who do not need the per-item quantity control. Feel free to add a comment.

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