HKDev 경험치 계산 함수

calcexp.php

<?php
class HKDev{
    public static function getTargetExp(int $lv){
        return $lv * $lv + 5;
    }

    public static function getArrExp(int $lv, int $currentExp=0){
        return 1 / 6 * $lv * (2 * $lv * $lv -(3 * $lv) + 31) + $currentExp;
    }

    public static function getLevel(int $exp){
        $f = pow(sqrt(3) * sqrt(3888 * $exp * $exp -(19440 * $exp) + 229679) - (108 * $exp) + 270, 1/3);
        return floor(-$f / (2 * pow(9,1/3)) + 59 / (2 * pow(3, 1/3) * $f) + 0.5);
    }
}