递归在PHP中的应用举例

递归在PHP中的应用举例

<?php
//amortizationTable表示还贷计算函数
function amortizationTable($pNum, $periodicPayment, $balance, $monthlyInterest)
{
//计算支付利息
$paymentInterest = round ($balance*$monthlyInterest, 2);
//计算还款额
$paymentPrincipal = round($periodicPayment - $paymentInterest,2);
//用余额减去还款额
$newBalance = round($balance-$paymentPrincipal,2);
//如果余额<每月还款，设置为0
if ($newBalance < $paymentPrincipal){
   $newBalance = 0;
}

printf ("<tr><td>%d</td>",$pNum);
printf ("<td>$%s</td>", number_format ($newBalance,2));
printf ("<td>$%s</td>", number_format ($periodicPayment,2));
printf ("<td>$%s</td>", number_format ($paymentPrincipal,2));
printf ("<td>$%s</td></tr>", number_format ($paymentInterest,2));

#if balance not yet zero, recursively call amortizationTable()
if ($newBalance>0){
   $pNum++;
   amortizationTable($pNum, $periodicPayment,
                      $newBalance, $monthlyInterest);
	}else{
	return 0;
	}
}

$balance = 10000.00;                                 // 贷款余额
$interestRate = 0.0575;                              //贷款利率
$monthlyInterest = $interestRate/12;                 //每月利率
$termLength = 5;                                     //贷款期限，单位为年
$paymentsPerYear = 12;                               //每年支付次数
$paymentNumber = 1;                                  //付款迭代
$totalPayments = $termLength*$paymentsPerYear;       //确定付款次数
$intCalc = 1 + $interestRate / $paymentsPerYear;     //确定分期付款的利息部分
$periodicPayment = $balance * pow($intCalc, $totalPayments)*($intCalc -1)/(pow($intCalc,$totalPayments) -1);

//每月还款额限制到小数点后两位
$periodcPayment = round($periodicPayment,2);

//创建表
echo "<table width='50%' align = 'center' border = '1'>";
echo "<tr>
      <th>Payment Number</th><th>Balance</th>
	  <th>payment</th><th>Principal</th><th>Interest</th>
	  </tr>";
	  
//创建递归函数
amortizationTable ($paymentNumber, $periodcPayment, $balance,$monthlyInterest);
//关闭表
echo "</table>";
?>