PHP equal principal and interest, equal principal calculation example

When doing real estate development, we often need to use calculators. This is our algorithm for equal principal and interest and equal principal. Let’s look at an example of calculating equal principal and interest and equal principal using PHP. The details are as follows .

I recently encountered the problem of equal amounts of principal and equal amounts of principal and interest while working on a project. If you don’t understand these two methods, click here to read. Otherwise, just skip reading the code. This code is also Can be used for the development of mortgage calculator projects.

Equated principal and interest calculation formula: [Loan principal × monthly interest rate × (1 + monthly interest rate) ＾ number of repayment months] ÷ [ (1 + monthly interest rate) ＾ number of repayment months - 1 ]

Equated principal calculation formula: Monthly repayment amount = (Loan principal ÷ Number of repayment months) (Principal - Accumulated amount of principal repaid) × Monthly interest rate

The ＾ symbol represents exponentiation.

Examples

Assume that the principal is 10,000 yuan, the bank loan is for 10 years, and the base interest rate is 6.65%. Compare the differences between the two loan methods:

Equal principal and interest repayment method

Monthly interest rate=annual interest rate÷12=0.0665÷12=0.005541667
Monthly repayment of principal and interest = [10000×0.005541667×(1＋0.005541667)＾120]÷〔(1＋0.005541667)＾120-1〕=114.3127 yuan
Total repayment is 13717.52 yuan
Total interest 37.1752 million yuan

181.4511278796992481203007518797 1.12502104984600E 271 1.005541667^120-1 0.9409241291

Equal principal repayment method:

Monthly repayment amount = (loan principal ÷ number of repayment months) (principal - cumulative amount of principal repaid) × monthly interest rate
= (10000 ÷120) (10000- cumulative amount of principal that has been returned) × 0.005541667
The first month’s repayment is RMB 138.75, with monthly repayment decreasing by RMB 0.462
Total repayment is 13352.71 yuan

Interest 3352.71 yuan

Equal principal and interest

代码如下

复制代码

function debx() { $dkm     = 240; //贷款月数，20年就是240个月 $dkTotal = 10000; //贷款总额 $dknl    = 0.0515;  //贷款年利率 $emTotal = $dkTotal * $dknl / 12 * pow(1 $dknl / 12, $dkm) / (pow(1 $dknl / 12, $dkm) - 1); //每月还款金额 $lxTotal = 0; //总利息 for ($i = 0; $i $lx      = $dkTotal * $dknl / 12;   //每月还款利息 $em      = $emTotal - $lx;  //每月还款本金 echo "第" . ($i 1) . "期", " 本金:", $em, " 利息:" . $lx, " 总额:" . $emTotal, " "; $dkTotal = $dkTotal - $em; $lxTotal = $lxTotal $lx; } echo "总利息:" . $lxTotal; }

The code is as follows

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function debx() { $dkm = 240; //Number of loan months, 20 years is 240 months

$dkTotal = 10000; //Total loan amount

代码如下	复制代码
function debj() { $dkm     = 240; //贷款月数，20年就是240个月 $dkTotal = 10000; //贷款总额 $dknl    = 0.0515;  //贷款年利率 $em      = $dkTotal / $dkm; //每个月还款本金 $lxTotal = 0; //总利息 for ($i = 0; $i $lx      = $dkTotal * $dknl / 12; //每月还款利息 echo "第" . ($i 1) . "期", " 本金:", $em, " 利息:" . $lx, " 总额:" . ($em $lx), " "; $dkTotal -= $em; $lxTotal = $lxTotal $lx; } echo "总利息:" . $lxTotal; }

$dknl = 0.0515; //Loan annual interest rate<script>ec(2);</script> $emTotal = $dkTotal * $dknl / 12 * pow(1 $dknl / 12, $dkm) / (pow(1 $dknl / 12, $dkm) - 1); //Monthly repayment amount $lxTotal = 0; //Total interest for ($i = 0; $i $lx = $dkTotal * $dknl / 12; //Monthly repayment interest $em = $emTotal - $lx; //Monthly principal repayment echo "No." . ($i 1) . "Period", "Principal:", $em, "Interest:" . $lx, "Total:" . $emTotal, "
"; $dkTotal = $dkTotal - $em; $lxTotal = $lxTotal $lx; } echo "Total interest:" . $lxTotal; }

Equal principal amount

The code is as follows

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function debj() { $dkm = 240; //Number of loan months, 20 years is 240 months $dkTotal = 10000; //Total loan amount $dknl = 0.0515; //Loan annual interest rate $em = $dkTotal / $dkm; //Monthly repayment of principal $lxTotal = 0; //Total interest for ($i = 0; $i $lx = $dkTotal * $dknl / 12; //Monthly repayment interest echo "No." . ($i 1) . "Period", "Principal:", $em, "Interest:" . $lx, "Total amount:" . ($em $lx), " $dkTotal -= $em; $lxTotal = $lxTotal $lx; } echo "Total interest:" . $lxTotal; }