简析PHP拆红包算法

/**
     * 拆分红包
     * @param SendRedPackageRequest $request
     * @return array
     */
    protected function spitMoney(SendRedPackageRequest $request)
    {
        $result = [];
        $reamingMoney = $request->money;
        for ($i = $request->count; $i >= 1; $i--) {
            if ($i === 1) {
                $result[] = round($reamingMoney, 2);
                $reamingMoney = 0;
            } else {
                $average = round(bcdiv($reamingMoney, $i), 2);    //平均值
                $amount = round(mt_rand(1, $average * 199) / 100, 2);
                $reamingMoney = doubleval(bcsub($reamingMoney, $amount));
                $result[] = round($amount, 2);
            }
        }
        return $result;
    }