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2019-12-26

php抽奖概率的算法
php抽奖概率的算法
概率算法抽奖活动中用得是最多的了，下面就直接上代码：<?php /** * Author: Dcr163 * Date: 2022/3/25 * Time: 10:25 */ /** * 获取中奖奖品下标 区间模式 * @param array $prizeList * @return int|string|null */ function beganToDrawBetween(array $prizeList) { //总概率统计 $sumRatio = array_sum(array_column($prizeList, 'ratio')); // 初始化随机数，奖品区间 $randNum = mt_rand(1, $sumRatio); $leftInterval = 0; $rightInterval = 0; $lastRightInterval = 0; foreach ($prizeList as $k => $prize) { // 左区间 ...
2019-12-26

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