Maths function problems.

[therat]

I have borrowed the following function from a phpBB MOD and want to use it elsewhere but cant get it working. The function is

    function do_math($firstval, $value, $total)
    {
        $cst = ($firstval > 0) ? 90 / $firstval : 90;
        if ($value != 0) 
        {
            $percentage = ( $total ) ? round( min(100, ($value / $total) * 100)) : 0;
        }
        else
        {
            $percentage = 0;
        }
        $bar_percent = round($value * $cst);
    } 

When I call the function I dont get any output, not even an error message. I have called it using the following, the numbers are chosen at random to see what output I got. I assume it is the actual function that is wrong, any suggestions.

$statistics = do_math('188', '22', '33');
print_r ($statistics) 

[exam]

add this to the end of the function:
return array ($cst, $percentage, $bar_percent);

[cdwhalley.com]

Why do you work out the variable $percentage, and then not do anything with it?
You should return something....

EDIT: Sorry - started reply when there were no others...

[therat]

add this to the end of the function:
return array ($cst, $percentage, $bar_percent);

Works perfectly, thanks.