help needed with cart function

[adi123]

I have 3 actions below which control my cart. My problem is with the minus action. It's supposed to remove 1 quantity from the cart but instead it takes the quantity all the way down to 1.

 

for example: you add 3 quantities of a usb stick and you want to remove 1 quantity, it would take the amount of quantity to 1 instead of 2.

 

here are the functions:

 

switch ($action) {

case 'add':

if ($cart) {

$cart .= ','.$_GET['id'];

header("Location: cart.php");

} else {

$cart = $_GET['id'];

header("Location: cart.php");

}

break;

case 'minus':

if ($cart) {

$items = explode(',',$cart);

$newcart = '';

foreach ($items as $item) {

if ($_GET['id'] != $item) {

if ($newcart != '') {

$newcart .= ','.$item;

} else {

$newcart = $item;

}

}

}

$cart = $item - $id;

}

break;

case 'update':

if ($cart) {

$newcart = '';

foreach ($_POST as $key=>$value) {

if (stristr($key,'qty')) {

$id = str_replace('qty','',$key);

$items = ($newcart != '') ? explode(',',$newcart) : explode(',',$cart);

$newcart = '';

foreach ($items as $item) {

if ($id != $item) {

if ($newcart != '') {

$newcart .= ','.$item;

} else {

$newcart = $item;

}

}

}

for ($i=1;$i<=$value;$i++) {

if ($newcart != '') {

$newcart .= ','.$id;

} else {

$newcart = $id;

}

}

}

}

}

$cart = $newcart;

break;

}

 

can some help with the minus function. thanks

[schilly]

What does $cart look like?

[ngreenwood6]

why dont you just store an array of all of the values in the cart? This way you can easily add/remove the items then when you want to display the items to the user you could just simply do:

 

 

$cart_text = implode(',',$cart);

 

[ignace]

$cart = $item - $id;

 

should be:

 

$cart = $newcart;

 

 

[adi123]

That doesn't work either. All it does is send the quantity back to 1 rather than remove a quantity.