Php Laravel 订单号生成规则

private function generateOrderNo(int $datacenter = -1, int $workerid = -1)
{
    $order_no = date('ymdHis');

    // 取毫秒
    $millisecond = substr(microtime(), 2, 3);

    $datacenter = $datacenter > 31 || $datacenter < 0 ? mt_rand(0, 31) : $datacenter;
    $workerid = $workerid > 31 || $workerid < 0 ? mt_rand(0, 31) : $workerid;

    $workerLength = 5; // $datacenter 和 $workerid 占用的位数
    $workerLeftMoveLength = 12; // 随机位 12 位 即 4095
    $datacenterLeftMoveLength = $workerLeftMoveLength + $workerLength; // 17 $workerid 5 位 即 31
    $timestampLeftMoveLength = $datacenterLeftMoveLength + $workerLength; // 22

    // 毫秒时间戳 10 位 0 - 1023 （最高位可能是0, 生成后高位补0）
    $ext = (string) (((intval($millisecond)) << $timestampLeftMoveLength)
        | ($datacenter << $datacenterLeftMoveLength)
        | ($workerid << $workerLeftMoveLength)
        | (mt_rand(0, 4095))); // 随机位

    // 前置补0 10位
    $order_no .= str_pad($ext, 10, '0', STR_PAD_LEFT);

    return $order_no;
}