Byte Converter

function formatBytes(int $size, array $prefixes = array('B', 'Kb', 'Mb', 'Gb', 'Tb'), int $kbyte_base = 1024) {
    $pointer = 0;
    do {
        $delimiter = pow($kbyte_base, $pointer);
        $num       = $size / $delimiter;

        if ($num > 999 && count($prefixes) - 1 > $pointer) {
            $pointer++;
        }
    } while ($num > 999 && count($prefixes) - 1 > $pointer);

    $num = number_format($num, $pointer !== 0 ? 2 : 0, '.', '');

    return "$num $prefixes[$pointer]";
}