php 系统评分 已知评分总人数，最终评分 粗略规划各等级评分人数

public function score()
    {
        $rateTotal  = 25;//总评分人数
        $rateScore  = 7.5;//最终评分 10分制
        $totalScore = intval($rateTotal * $rateScore / 2); //总评分 转化为5分制
        $percent    = $rateScore / 10;

        $grade = [5, 4, 3, 2, 1];
        $data = [];
        foreach ($grade as $item) {
            if ($item == 1) {
                $num = intval($totalScore);
            } else {
                $num = intval($totalScore * $percent / $item);//向下取整，就不用考虑数据超出的问题
            }
            $totalScore = $totalScore - $num * $item;
            $data[$item] = $num;
        }
        var_dump($data);
    }