How to format numbers similar to Stack Overflow reputation format

Question

I want to convert a number into a string representation with a format similar to Stack Overflow reputation display.

e.g.

• 999 == \'999\'
• 1000 =

Answer 1

Here is a function in PHP which is part of iZend - http://www.izend.org/en/manual/library/countformat:

function count_format($n, $point='.', $sep=',') {
    if ($n < 0) {
        return 0;
    }

    if ($n < 10000) {
        return number_format($n, 0, $point, $sep);
    }

    $d = $n < 1000000 ? 1000 : 1000000;

    $f = round($n / $d, 1);

    return number_format($f, $f - intval($f) ? 1 : 0, $point, $sep) . ($d == 1000 ? 'k' : 'M');
}