PHP Mysqli add subtract number format

HI just found a solution about add and sustract two columns here but I need to make the php code to format the numbers.

Here is the solution I got here:

<?php
while ($row= mysqli_fetch_assoc($result)) {
    echo $row['money'] - $row['cost'];
}
?>

Its working fine for what I need but here is the thing. I use to run the follow php code to all money and numbers

<?php echo number_format($product['cost'],0, ",", "."); ?>

That way the numbers will display without decimals and like this 100.000

How can I make the code I found here to work with number format?

Something like this I tried but does not work

<?php
while ($row= mysqli_fetch_assoc($result)) {
    echo number_format$row['money'] - number_format$row['cost'];
}
?>

It must substract and then show the result with formated numbers

Answer

you need to put it in ()

 echo number_format($row['money'] - $row['cost'],0,',','.');

More than 2 :

echo number_format($row['money'] - $row['cost'] + $row['whatever'] * $row['whatever'],0,',','.');