PHP實現微信紅包金額拆分試玩的算法實例詳解

<?php
// 新年紅包金額拆分試玩

class CBonus
{
  public $bonus;//紅包
  public $bonus_num;//紅包個數
  public $bonus_money;//紅包縂金額
  public $money_single_max;//單個紅包限額
  
  public function __construct(){
    $this->bonus_num = 10;
    $this->bonus_money = 200;
    $this->money_single_max = 60;
  }

  private function randomFloat($min = 0, $max = 1) {
    $mt_rand = mt_rand();
    $mt_getrandmax = mt_getrandmax();
    echo 'mt_rand=' . $mt_rand . ', mt_getrandmax=' . $mt_getrandmax . '<hr/>';
    return $min + $mt_rand / $mt_getrandmax * ($max - $min);
  }
  //計算
  public function compute()
  {
    $this->bonus = array();
    $bonus_money_temp = $this->bonus_money;
    $money_single_max = $this->money_single_max;
    $i = 1;
    while($i < $this->bonus_num)
    {
      if ($money_single_max > $bonus_money_temp)
      {
        $money_single_max = floatval(sprintf("%01.2f", $bonus_money_temp / 2));//賸餘金額不夠分時,把賸餘金額的一半作爲備用金
      }
      $bonus_money_rad = $this->randomFloat(0.01, $money_single_max);//一個紅包隨機金額 最小的1分錢
      $bonus_money_rad = floatval(sprintf("%01.2f", $bonus_money_rad));
      $bonus_money_temp = $bonus_money_temp - $bonus_money_rad ;//待分配的縂賸餘金額
      $bonus_money_temp = floatval(sprintf("%01.2f", $bonus_money_temp));
      $this->bonus[] = $bonus_money_rad;
      //echo $bonus_money_rad . ',' . $bonus_money_temp . '<hr/>';
      $i++;
    }
    $this->bonus[] = $bonus_money_temp;//分配賸餘金額給最後一個紅包
  }
  //打印
  public function output(){
    $total = 0;
    foreach($this->bonus as $k => $v)
    {
      echo '紅包' . ($k+1) . '=' . $v . '<br/>';
      $total += $v;
    }
    echo '紅包縂金額:'.$total;
  }
}

$CBonus = new CBonus();
$CBonus->compute();
$CBonus->output();
?>