[PHP知识库]php最大余额法解决统计最后百分比相加不等于100

    /**
     * Notes: 最大余额法
     * User: 曲帅
     * DateTime: 2022/2/25 0025  18:12
     * @param array $valueList 二维数组 [['count' => 1],['count' => 2],['count' => 3]]
     * @param $contKey string 要统计的字段
     * @param $precision int 精度
     * @param $percentKey int 百分比键名
     * @return array
     */
    public function getPercentValue(array $valueList, string $contKey, int $precision = 2, $percentKey = 'percent'): array
    {
        if (count($valueList) === 0) {
            return [];
        }
        $sum = array_sum(array_column($valueList, $contKey));
        if ($sum === 0) {
            foreach ($valueList as $k => $v) {
                $valueList[$k][$percentKey] = 0;
            }
            return $valueList;
        }
        $digits = pow(10, $precision);
        $currentSum = 0;
        $remainder = [];
        foreach ($valueList as $k => $v) {
            $votesPerQuota = $v[$contKey] / $sum * $digits * 100;
            $valueList[$k]['integer'] = (int)$votesPerQuota;
            // 余额
            $remainder[$k] = $votesPerQuota - $valueList[$k]['integer'];
            // 整数总数（会小于真正总数）
            $currentSum += $valueList[$k]['integer'];
        }
        $targetSeats = $digits * 100;
        while ($currentSum < $targetSeats) {
            $key = array_search(max($remainder), $remainder);
            $valueList[$key]['integer']++;
            unset($remainder[$key]);
            $currentSum++;
        }
        foreach ($valueList as $k => $v) {
            $valueList[$k][$percentKey] = $v['integer'] / $targetSeats;
            unset($valueList[$k]['integer']);
        }
        return $valueList;
    }
}