回答

<?php


function rand_money($total_bean, $total_packet) {

    $min_bean = 1;

    $max_bean = 5000;

    $range = 2;

    $total_bean = $total_bean - $total_packet * $min_bean; //每个人预留一个最小值

    $list = [];

    $min = 1;

    while (count($list) < $total_packet-1) {

        $max = floor($total_bean / $total_packet) * $range;

        $bean = rand($min, $max);

        if ($bean <= $max_bean - 1) {

            $list[] = $bean;

            $total_bean -= $bean;

        }

    }

    $list[] = $total_bean; //剩余的金豆作为最后一个红包

    //合并

    foreach ($list as $k => $v) {

        $list[$k] += $min_bean;

    }

    return $list;

}
$totalmoney = 10000;//总共10000分就是100元大洋
$totalperson = 50;//需要邀请50人
$startprice = mt_rand(6000, 8000);//第一次随机一个进度，进度在60%到80%之间
echo $startprice; 
$leftmoney = $totalmoney-$startprice;//剩余的进度随机拆分

$ret = rand_money($leftmoney, $totalperson-1); //
rsort($ret);//大小排序，约到最后每次邀请的人增加的金额就越小，前面越大
var_dump($ret); //邀请每个人的分钱数
echo $ret[0];
echo array_sum($ret); //分钱后的钱总和