[md]

    //随机分配红包
    protected static function getRandomMoneyList($total, $num)
    {
        $sourceMoney = $total;
        if($num==1) return [$total];
        if(strpos($total, '.') !==false) {
            $array_ = explode('.', $total);
            $decimal = strlen(end($array_))+1;
        } else {
            $decimal = 3;
        }

        $beishu = pow(10, $decimal);//放大倍数 运算后再缩小

        $bcsub1 = function ($a, $b) use($decimal) {
            return bcsub($a, $b, $decimal);
        };
        $bcdiv1 = function ($a, $b) use($decimal) {
            return bcdiv($a, $b, $decimal);
        };
        $bcmul1 = function ($a, $b) use($decimal) {
            return bcmul($a, $b, $decimal);
        };
        $bcadd1 = function ($a, $b) use($decimal) {
            return bcadd($a, $b, $decimal);
        };
        $bcMin = function ($a, $b) use($decimal)  {
            return bccomp($a, $b, $decimal) > 0 ? $b : $a;
        };
        $bcMax = function ($a, $b) use($decimal)  {
            return bccomp($a, $b, $decimal) > 0 ? $a : $b;
        };

        //   print_r("beishu:".$beishu."\n");
        //   print_r("decimal:".$decimal."\n");
        $total = bcmul($total, $beishu, 2);
        $max = $bcmul1($total, 0.9);
        $min = $bcdiv1($bcdiv1($total, $num), 20);
        //   print_r("max:".$max."\n");
        //   print_r("min:".$min."\n");
        $re=[];
        $restMoney = $total;
        while ($num>0){
            if($num ==1) {
                $money = $restMoney;
                $restMoney= 0;
                $num--;
            } else {
                $vag = $bcdiv1($restMoney, $num);//1.计算红包的平均金额，四舍五入保留两位小数点

                //   print_r('$vag____'.PHP_EOL);
                //   var_dump($vag);
                $num --;
                $tmp_max = $bcMin($max, $bcsub1($restMoney, $bcmul1($num ,$min)));//保证剩下红包金额不小于范围中的最小值
                $tmp_min = $bcMax($min, $bcsub1($restMoney, $bcmul1($num, $max)) );//保证剩下红包金额不大于范围中的最大值
                $vag_diff = $bcMin($bcsub1($tmp_max, $vag), $bcsub1($vag, $tmp_min));//波动幅度
                $end_max = $bcadd1($vag, $vag_diff);//保证剩下红包金额不小于范围中的最小值
                $end_min = $bcsub1($vag, $vag_diff);
                $end_min  = (int) ($end_min); //去掉末尾的0
                $end_max  = (int) ($end_max); //去掉末尾的0
                //   print_r('$end_min____'.PHP_EOL);
                //   var_dump($end_min);
                //   print_r('$end_max____'.PHP_EOL);
                //   var_dump($end_max);
                $money = mt_rand($end_min, $end_max);
                $restMoney  = bcsub($restMoney, $money, 20);
            }
            $re[] = bcdiv($money, $beishu, $decimal);
        }
        shuffle($re);
        $countTotal = 0;
        foreach($re as $n=>$v) {
            $countTotal  = $bcadd1($countTotal, $v);
        }
        if(bccomp($countTotal, bcadd($sourceMoney, 0, 20), 20) !=0) {
            print_r('count______:'. $countTotal .'|source:'. $sourceMoney .PHP_EOL);
            throw new \Exception('分配金额不彻底');
        }
        return $re;

    }