php趣味编程-php求个人所得税

<?php
header("Content-Type: text/html; charset=utf-8");
/*
个人所得税 以3500后的数字
1       500             5       0
2       500-2000        10      25=500*0.5
3       2000-5000       15      25+150 = 175
4       5000-20000      20      25+150+450 = 625
5       20000-40000     25      25+150+450+15000*0.2=625+3000=3625
6       40000-60000     30      3625 + (40000-20000)*0.25 =3625 +5000=8625
7       60000-80000     35      8625+6000 = 14625
8       80000-100000    40      14625 + 2*0.35 = 21625
9       100000-.....    45      21625 + 2*0.4 = 29625
4000 - 3500 = 500*0.05=25
4100 -3500  = 610 = 500*0.05+110*0.10=25+11
8000 -3500  = 4500 = 500*0.05 + (2000-500)*0.1 + 2500*0.15
*/
?>
<?php
    $money = 1108800; //个人的月收入
    $jibie = $money - 3500;//交税的钱
       
    if($jibie <= 500)
    {
        $a = $jibie * 0.05;//所得税-就是每个月交的税
    }
    else if($jibie <= 2000){
        $a = 25 +($jibie - 500)*0.1;
    }
    else if($jibie <= 5000){
        $a = 175 + ($jibie - 2000)*0.15;
    }
    else if($jibie <=20000){
        $a = 625 + ($jibie - 5000)*0.2;
    }
    else if($jibie <= 40000){
        $a = 3625+($jibie - 20000)*0.25;
    }
    else if($jibie <=60000){
        $a = 8625 + ($jibie - 40000)*0.3;
    }
    else if($jibie <=80000){
        $a = 14625 + ($jibie - 60000)*0.35;
    }
    else if($jibie <=100000){
        $a = 21625 +($jibie - 80000)*0.4;
    }
    else{
        $a = 29625+($jibie - 100000)*0.45;
    }
    //echo $a;
?>
<?php
    /*
    累积的不要手动算
    */
    $salary = array(0,500,2000,5000,20000,40000,60000,80000,100000);//用来存个人所得的钱
    $rate =array(5,10,15,20,25,30,35,40,45);//税息
       
    $moneys = 5000;//假设月收入
    $b = $moneys - 3500;
    $index = 0;
    $sum = 0;
    for($i=0;$i<sizeof($salary);$i++){
        if($b <$salary[$i]){
            $index = $i;
            break;
        }
    }
       
    //循环得到扣除累计算
    for($i=0;$i<$index;$i++)
    {
        $sum = $sum+( $salary[$i+1] - $salary[$i] )*$rate[$i]*0.01;
    }
       
    $a = $sum + ($moneys-$salary[$index-1])*$rate[$index-1]*0.01;
    echo '月收入:'.$moneys.'交税是：'.$a;
?>