Vendor/phpspreadsheet/phpoffice/phpspreadsheet/src/PhpSpreadsheet/Calculation/Financial.php
public static function FVSCHEDULE($principal, $schedule)
    {
        $principal = Functions::flattenSingleValue($principal);
        $schedule = Functions::flattenArray($schedule);

        foreach ($schedule as $rate) {
            $principal *= 1 + $rate;
        }

        return $principal;
    }
public static function FVSCHEDULE($principal, $schedule)
    {
        $principal = Functions::flattenSingleValue($principal);
        $schedule = Functions::flattenArray($schedule);

        foreach ($schedule as $rate) {
            $principal *= 1 + $rate;
        }

        return $principal;
    }
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 float $principal the present value
@param float[] $schedule an array of interest rates to apply

@return float