(php)生成指定个数的随机红包

 <?php
 $total=20;//红包总金额
 $num=10;// 分成10个红包，支持10人随机领取
 $min=0.01;//每个人最少能收到0.01元
  $redpack = new redpack($total,$num,$min);
  $jieguo = $redpack->getPack();
  foreach($jieguo as $key=>$val){
      $n = $key+1;
      echo '第'.$n.'个红包：'.$val['money'].' 元，余额：'.$val['balance'].' 元<br>';
  }

 class redpack{
     //总金额
     private $total=0;
     //红包数量
     private $num=0;
     //最小红包金额
     private $min=0.01;

     public function __construct($total,$num,$min)
     {
         $this->total = $total;
         $this->num = $num;
         $this->min = $min;
     }
     //红包结果
     public function getPack()
     {
         $total = $this->total;
         $num = $this->num;
         $min = $this->min;
         for ($i=1;$i<$num;$i++)
         {
             $safe_total=($total-($num-$i)*$min)/($num-$i);//随机安全上限
             $money=mt_rand($min*100,$safe_total*100)/100;
             $total=$total-$money;
             //红包数据
             $readPack[]= [
                 'money'=>$money,
                 'balance'=>$total,
             ];
         }
         //最后一个红包，不用随机
         $readPack[] = [
             'money'=>$money,
             'balance'=>0,
         ];
         //返回结果
         return $readPack;
     }

 }