Multiplying variables

Jon12345

I have the following code:

<?php 
$theAmount = $_REQUEST['amount']; 
$theCurrency = $_REQUEST['currency']; 
?>
<meta http-equiv="refresh" content="4;URL=http://www.mysite.com/tracked.php?amount=$theAmount">

The currency can be in two values, either GBP or USD.

How can I ensure that $theAmount gets set to half the passed value if currency = USD, but is not altered if it is currency = GBP?

Thanks,

Jon

NogDog

Use an if control structure?

Jon12345

Would this do it?

<?php 
$theAmount = $_REQUEST['amount']; 
$theCurrency = $_REQUEST['currency']; 
if ($theCurrency=="USD") {
$theAmount=$theAmount*0.5;
}
?>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<meta http-equiv="refresh" content="4;URL=http://www.accessdatabaserepair.com/ordercompleted.php?amount=$theAmount">

halojoy

Another way, maybe easier, is to:
Make the price 2 times higher, if paid in USD

<?php

$thePrice = 100;
$theAmount   = $_REQUEST['amount']; 
$theCurrency = $_REQUEST['currency'];

if ($theCurrency=="USD") {
      $thePrice = 2 * $thePrice;
}

?>

tekky

I'd do it this way...

<?php 
$theAmount = $_REQUEST['amount']; 
$theCurrency = $_REQUEST['currency']; 
if ($theCurrency=="USD") {
$theAmount*=0.5;
}
?>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<meta http-equiv="refresh" content="4;URL=http://www.accessdatabaserepair.com/ordercompleted.php?amount=$theAmount">

laserlight

I think it is just a matter of style. Pointing point arithmetic may be slower than integer arithmetic, multiplication may be faster than division, but it probably does not matter either way in the context of a PHP script.

What has been missed out in the context of PHP is that $REQUEST['amount'] and $REQUEST['currency'] has not been checked and thus may not exist, or could be negative.