PHP实现微信红包金额拆分试玩的算法示例

class CBonus
{
public $bonus;//红包
public $bonus_num;//红包个数
public $bonus_money;//红包总金额
public $money_single_max;//单个红包限额

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 . '

---

';
return $min + $mt_rand / $mt_getrandmax * ($max - $min);
}
//计算
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));//剩余金额不够分时,把剩余金额的一半作为备用金
}
$bonus_money_rad = $this->randomFloat(0.01,$money_single_max);//一个红包随机金额 最小的1分钱
$bonus_money_rad = floatval(sprintf("%01.2f",$bonus_money_rad));
$bonus_money_temp = $bonus_money_temp - $bonus_money_rad ;//待分配的总剩余金额
$bonus_money_temp = floatval(sprintf("%01.2f",$bonus_money_temp));
$this->bonus[] = $bonus_money_rad;
//echo $bonus_money_rad . ',' . $bonus_money_temp . '

---

';
$i++;
}
$this->bonus[] = $bonus_money_temp;//分配剩余金额给最后一个红包
}
//打印
public function output(){
$total = 0;
foreach($this->bonus as $k => $v)
{
echo '红包' . ($k+1) . '=' . $v . '
';
$total += $v;
}
echo '红包总金额:'.$total;
}
}

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