Question

I need to add amounts if a customer buys more than one product. how to add using session variables. I stored the amount as

$amount=$_POST['amount']
$_SESSION['amount']=$amount;

doing the following thing isnt solving the problem

$_SESSION['amount']+=$amount;

Answer 1

With the below code you are ovewriting the content of $_SESSION['amount'] with the current value of $_POST['amount']:

$amount=$_POST['amount']
$_SESSION['amount']=$amount;

You should do something like this:

$currentAmount      = $_POST['amount']
$_SESSION['amount'] += $currentAmount;

Don’t forget to check if you are calling session_start() at the beginning of the script.