基金指数C持有多长时间比指数A划算？计算方法

<?php
header("content-type:text/html;charset=utf-8");
//以投资1万元为例
$money = 10000;
//指数A
$a_mairu = 0.0015;
$a_guanli = 0.006;
$a_tuoguan = 0.001;
$a_xiaoshou = 0;
$a_maichu_level = [0,7,30,180,365];//定义卖出时间范围
$a_maichu_arr = array(0.015,0.0075,0.0050,0.0025,0);//定义卖出时间范围的费率
$a_sum_guanli = 0;
//指数C
$c_mairu = 0;
$c_guanli = 0.006;
$c_tuoguan = 0.001;
$c_xiaoshou = 0.003;
$c_maichu_level = [0,7,30];
$c_maichu_arr = array(0.0015,0.0075,0);
$c_sum_guanli = 0;


for($day = 1;$day<=365;$day++){
	echo "投资第".$day."天";
	//第一天有申购费率
	if($day==1){
		echo " 指数A申购费用".$money*$a_mairu."元";
		echo " 指数C申购费用".$money*$c_mairu."元";
		$a_sum_guanli = $a_sum_guanli + $money*$a_mairu;
		$c_sum_guanli = $c_sum_guanli + $money*$c_mairu;
	}
	//运作费率
	$a = round(($a_guanli+$a_tuoguan+$a_xiaoshou)/365*10000,2);
	$c = round(($c_guanli+$c_tuoguan+$c_xiaoshou)/365*10000,2);
	$a_sum_guanli = $a_sum_guanli + $a;
	$c_sum_guanli = $c_sum_guanli + $c;
	echo " 指数A总运作费用".$a_sum_guanli."元";
	echo " 指数C总运作费用".$c_sum_guanli."元";
	//赎回费
	//赎回A
	for($j=0;$j<count($a_maichu_level);$j++){
		if($j == count($a_maichu_level) - 1){
			if($day >= $a_maichu_level[$j]){
				//这里通过$j 取得你对应的等级 ，前面我省略了$i对应店铺等级的映射关系
				$a_sh_temp = round($a_maichu_arr[$j]*10000,2);
				echo " 指数A今日赎回费用".$a_sh_temp."元";
			}
		}else{
			if($day >= $a_maichu_level[$j] && $day < $a_maichu_level[$j+1]) {
				//这里通过$j 取得你对应的等级
				$a_sh_temp = round($a_maichu_arr[$j]*10000,2);
				echo " 指数A今日赎回费用".$a_sh_temp."元";
			}
		}
	}
	//赎回C
	for($j=0;$j<count($c_maichu_level);$j++){
		if($j == count($c_maichu_level) - 1){
			if($day >= $c_maichu_level[$j]){
				//这里通过$j 取得你对应的等级 ，前面我省略了$i对应店铺等级的映射关系
				$c_sh_temp = round($c_maichu_arr[$j]*10000,2);
				echo " 指数C今日赎回费用".$c_sh_temp."元";
			}
		}else{
			if($day >= $c_maichu_level[$j] && $day < $c_maichu_level[$j+1]) {
				//这里通过$j 取得你对应的等级
				$c_sh_temp = round($c_maichu_arr[$j]*10000,2);
				echo " 指数C今日赎回费用".$c_sh_temp."元";
			}
		}
	}
	echo " 指数A总费用".($a_sum_guanli+$a_sh_temp)."元";
	echo " 指数C总费用".($c_sum_guanli+$c_sh_temp)."元";
	echo '<br />';
}