Adding numbers with commas?

[netfrugal]

<? 
$var1 = '10,000';
$var2 = '3.59';

$sum = $var1 + $var2;

echo $sum;
?>

I'm getting "13.59"

I'm obviously missing something pertinent to adding numbers with commas.

Any help?

[Piranha]

It seems like it treat . and , the same way: a decimal delimiter. If you want numbers without decimals I suggest that you don't use either comma nor point.

If you want to get rid of something treat it as a string and use [man]preg_replace[/man].