Format number add k for more than 1000

formatnumber.php

public function formatNumber($number)
    {
        // add k format
        if ($number >= 1000 && $number < 1000000) {
            $number = number_format($number / 1000, 1) . 'k';
        } elseif ($number >= 1000000) {
            $number = number_format($number / 1000000, 1) . 'm';
        }
        return number_format($number, 2, '.', ',');
    }