Problem with formatting a number

I need help, i carried out a calculation for a number and then i try to format the output

   

$calc_int = ($int /100) * $cur_balance;


number_format($calc_int,2,".","");  

echo $calc_int;

But the result i still get is something like this; 128.217330796330

How can i get the output to be only 2 decimal points?

As you have found [man]number_format[/man] is easy to use.

$number = 1234.5678;

// two decimals
$new = number_format($number, 2);
$echo $new; // 1234.57

Would work with a little adjustment

$calc_int = ($int /100) * $cur_balance;

$calc_new = number_format($calc_int,2,".","");  

echo $calc_new;

Thanks