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<?php
namespace PhpOffice\PhpSpreadsheet\Calculation\Financial\CashFlow;
use PhpOffice\PhpSpreadsheet\Calculation\Exception;
use PhpOffice\PhpSpreadsheet\Calculation\Functions;
use PhpOffice\PhpSpreadsheet\Calculation\Information\ExcelError;
class Single
{
/**
* FVSCHEDULE.
*
* Returns the future value of an initial principal after applying a series of compound interest rates.
* Use FVSCHEDULE to calculate the future value of an investment with a variable or adjustable rate.
*
* Excel Function:
* FVSCHEDULE(principal,schedule)
*
* @param mixed $principal the present value
* @param float[] $schedule an array of interest rates to apply
*
* @return float|string
*/
public static function futureValue($principal, $schedule)
{
$principal = Functions::flattenSingleValue($principal);
$schedule = Functions::flattenArray($schedule);
try {
$principal = CashFlowValidations::validateFloat($principal);
foreach ($schedule as $rate) {
$rate = CashFlowValidations::validateFloat($rate);
$principal *= 1 + $rate;
}
} catch (Exception $e) {
return $e->getMessage();
}
return $principal;
}
/**
* PDURATION.
*
* Calculates the number of periods required for an investment to reach a specified value.
*
* @param mixed $rate Interest rate per period
* @param mixed $presentValue Present Value
* @param mixed $futureValue Future Value
*
* @return float|string Result, or a string containing an error
*/
public static function periods($rate, $presentValue, $futureValue)
{
$rate = Functions::flattenSingleValue($rate);
$presentValue = Functions::flattenSingleValue($presentValue);
$futureValue = Functions::flattenSingleValue($futureValue);
try {
$rate = CashFlowValidations::validateRate($rate);
$presentValue = CashFlowValidations::validatePresentValue($presentValue);
$futureValue = CashFlowValidations::validateFutureValue($futureValue);
} catch (Exception $e) {
return $e->getMessage();
}
// Validate parameters
if ($rate <= 0.0 || $presentValue <= 0.0 || $futureValue <= 0.0) {
return ExcelError::NAN();
}
return (log($futureValue) - log($presentValue)) / log(1 + $rate);
}
/**
* RRI.
*
* Calculates the interest rate required for an investment to grow to a specified future value .
*
* @param float $periods The number of periods over which the investment is made
* @param float $presentValue Present Value
* @param float $futureValue Future Value
*
* @return float|string Result, or a string containing an error
*/
public static function interestRate($periods = 0.0, $presentValue = 0.0, $futureValue = 0.0)
{
$periods = Functions::flattenSingleValue($periods);
$presentValue = Functions::flattenSingleValue($presentValue);
$futureValue = Functions::flattenSingleValue($futureValue);
try {
$periods = CashFlowValidations::validateFloat($periods);
$presentValue = CashFlowValidations::validatePresentValue($presentValue);
$futureValue = CashFlowValidations::validateFutureValue($futureValue);
} catch (Exception $e) {
return $e->getMessage();
}
// Validate parameters
if ($periods <= 0.0 || $presentValue <= 0.0 || $futureValue < 0.0) {
return ExcelError::NAN();
}
return ($futureValue / $presentValue) ** (1 / $periods) - 1;
}
}
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