[PHP知识库]PHP指定人数随机平均分配指定金额(伸缩法)

/**将一个数分成指定份数
 * @param $money_total
 * @param $num
 * @return array
 */
function cuttingNumber($money_total,$num){

    //随机生产$num个随机数
    $randArr = [];
    for ($i = 0;$i<$num;$i++){
        array_push($randArr,rand(100,200));
    }
    $randArrSum = array_sum($randArr);
    $n = $randArrSum/100;
        for ($i = 0;$i<count($randArr);$i++){
            $randArr[$i] = bcdiv($randArr[$i],$n,2);
        }
    $randArrSum = array_sum($randArr);
    if($randArrSum>100){
        $m = $randArrSum-100;
        //给最大一个值减去$m
        rsort($randArr);
        $randArr[0]-=$m;
    }else{
        $m = 100-$randArrSum;
        //给最小一个值加上$m
        sort($randArr);
        $randArr[0]+=$m;
    }
    $result = [];
    for($i=0;$i<$num;$i++){
        array_push($result,bcmul(bcdiv($randArr[$i],100,2),$money_total,2));
    }
    $resultSum = array_sum($result);
    if($resultSum>$money_total){
        $m = $resultSum-$money_total;
        //给最大一个值减去$m
        rsort($result);
        $result[0]-=$m;
    }else{
        $m = $money_total-$resultSum;
        //给最小一个值加上$m
        sort($result);
        $result[0]+=$m;
    }
    shuffle($result);
    return $result;
}