像Facebook这样的格式数字“喜欢” - PHP [关闭]

I need of a function in PHP to format numbers like Facebook "likes".

Example:

12345 = 12,3 K

123456 = 123 K

1234567 = 1,23 M

Thank you!!

Write a function which do this!?

function format_num($n) {
    $s = array("K", "M", "G", "T");
    $out = "";
    while ($n >= 1000 && count($s) > 0) {
        $n = $n / 1000.0;
        $out = array_shift($s);
    }
    return round($n, max(0, 3 - strlen((int)$n))) ." $out";
}