php计算税后工资的方法

<?php
function after_sleep($salary,$housefund_ratio=0.1,$person_insurance_ratio=.08,$medical_insurance_ratio=.04)
{
 $base = 3500;
 $housefund = $salary * $housefund_ratio; //.10 .8
 $person_insurance = $salary * $person_insurance_ratio;
 $medical_insurance = $salary * $medical_insurance_ratio;
 $insurance=($housefund + $person_insurance +$medical_insurance);
 if ($salary - $insurance < $base ){
  return $salary - $insurance;
 }
 $taxable_income= ($salary - $insurance -$base );
  if ($taxable_income <=1500 ){
  $ratio = .03;
  $deduct = 0;
 }else if ($taxable_income > 1500 && $taxable_income <=4500) {
  $ratio = .1;
  $deduct = 105;
 }else if ($taxable_income > 4500 && $taxable_income <=9000) {
  $ratio = .2;
  $deduct = 555;
 } else if ($taxable_income > 9000 && $taxable_income <= 35000) {
  $ratio = .25;
  $deduct = 1005;
 } else if ($taxable_income > 35000 && $taxable_income <= 55000) {
  $ratio = .3;
  $deduct = 2755;
 }
 $tax = $taxable_income * $ratio-$deduct;
 $money = $salary -$insurance-$tax;
 return $money;
}
echo "税前\t税后\n";
for ($i=5000;$i<=50000;$i+=3000)
echo $i,"\t",after_sleep($i,.08),"\n";