public function MortgageCalculatorCalculation::calculate in Real Estate Mortgage Calculator 8

Calculation function.

Return value

array

• a key 'rows' contains array of rows with $desired_display mortgage calculations
• a key 'number_of_payments' - a number of payments
• a key 'payment' - an amount of payments

File

src/MortgageCalculatorCalculation.php, line 66

Class

MortgageCalculatorCalculation

MortgageCalculatorCalculation.

Namespace

Drupal\mortgage_calculator

Code

public function calculate() {
  if ($this->desiredDisplay == 'monthly') {
    $rate_per = $this->mortgageRate / 100 / 12;
    $number_of_payments = $this->yearsToPay * 12;
  }
  else {
    $rate_per = $this->mortgageRate / 100;
    $number_of_payments = $this->yearsToPay;
  }
  if ($this->mortgageRate != 0) {
    $payment = $this->loanAmount * pow(1 + $rate_per, $number_of_payments) * $rate_per / (pow(1 + $rate_per, $number_of_payments) - 1);
  }
  else {
    $payment = $this->loanAmount / $number_of_payments;
  }
  $rows = [];
  $beginning_balance = $this->loanAmount;
  for ($i = 1; $i <= $number_of_payments; $i++) {
    $interest = $rate_per * $beginning_balance;
    $rows[] = [
      $i,
      round($beginning_balance),
      round($interest),
      round($payment),
      abs(round($beginning_balance - ($payment - $interest))),
    ];
    $beginning_balance -= $payment - $interest;
  }
  return [
    'rows' => $rows,
    'row' => [
      'number_of_payments' => $number_of_payments,
      'payment' => round($payment),
    ],
  ];
}