0 7 0 001 10 does not return 0

Question

The code snippet is as follows...

$orderAmount = $_POST['orderAmount'];
$adUnitPrice = 0.001;
if((($orderAmount/$adUnitPrice) % 10) == 0)
    $standardPayment = true;
else
    $standardPayment = false;

When I am passing $orderAmount as 0.6 or 0.8, I get the expected return of $standardPayment = true. But, when I am passing $orderAmount as 0.7, I get the unexpected return of $standardPayment = false

I dont understand why this is happening. Need help regarding this.

Answer 1

bcmath module can help you

bcmod(bcdiv("0.7", "0.001"), "10"); // returns 0

in your code

$orderAmount = $_POST['orderAmount'];
$adUnitPrice = 0.001;
if(bcmod(bcdiv($orderAmount, $adUnitPrice), 10) == 0) {
    $standardPayment = true;
} else {
    $standardPayment = false;
}

or even

$standardPayment = (bcmod(bcdiv($orderAmount, $adUnitPrice), 10) == 0);

you can check on command line with php -m and look if has the module or write a file with the follow

<?php phpinfo(); ?>