Rates.php

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<?php

namespace PhpOffice\PhpSpreadsheet\Calculation\Financial\Securities;

use PhpOffice\PhpSpreadsheet\Calculation\DateTimeExcel;
use PhpOffice\PhpSpreadsheet\Calculation\Exception;
use PhpOffice\PhpSpreadsheet\Calculation\Financial\Constants as FinancialConstants;
use PhpOffice\PhpSpreadsheet\Calculation\Functions;

class Rates
{
    public static function discount(
        $settlement,
        $maturity,
        $price,
        $redemption,
        $basis = FinancialConstants::BASIS_DAYS_PER_YEAR_NASD
    ) {
        $settlement = Functions::flattenSingleValue($settlement);
        $maturity = Functions::flattenSingleValue($maturity);
        $price = Functions::flattenSingleValue($price);
        $redemption = Functions::flattenSingleValue($redemption);
        $basis = ($basis === null)
            ? FinancialConstants::BASIS_DAYS_PER_YEAR_NASD
            : Functions::flattenSingleValue($basis);

        try {
            $settlement = SecurityValidations::validateSettlementDate($settlement);
            $maturity = SecurityValidations::validateMaturityDate($maturity);
            SecurityValidations::validateSecurityPeriod($settlement, $maturity);
            $price = SecurityValidations::validatePrice($price);
            $redemption = SecurityValidations::validateRedemption($redemption);
            $basis = SecurityValidations::validateBasis($basis);
        } catch (Exception $e) {
            return $e->getMessage();
        }

        if ($price <= 0.0) {
            return Functions::NAN();
        }

        $daysBetweenSettlementAndMaturity = DateTimeExcel\YearFrac::fraction($settlement, $maturity, $basis);
        if (!is_numeric($daysBetweenSettlementAndMaturity)) {
            //    return date error
            return $daysBetweenSettlementAndMaturity;
        }

        return (1 - $price / $redemption) / $daysBetweenSettlementAndMaturity;
    }

    public static function interest(
        $settlement,
        $maturity,
        $investment,
        $redemption,
        $basis = FinancialConstants::BASIS_DAYS_PER_YEAR_NASD
    ) {
        $settlement = Functions::flattenSingleValue($settlement);
        $maturity = Functions::flattenSingleValue($maturity);
        $investment = Functions::flattenSingleValue($investment);
        $redemption = Functions::flattenSingleValue($redemption);
        $basis = ($basis === null)
            ? FinancialConstants::BASIS_DAYS_PER_YEAR_NASD
            : Functions::flattenSingleValue($basis);

        try {
            $settlement = SecurityValidations::validateSettlementDate($settlement);
            $maturity = SecurityValidations::validateMaturityDate($maturity);
            SecurityValidations::validateSecurityPeriod($settlement, $maturity);
            $investment = SecurityValidations::validateFloat($investment);
            $redemption = SecurityValidations::validateRedemption($redemption);
            $basis = SecurityValidations::validateBasis($basis);
        } catch (Exception $e) {
            return $e->getMessage();
        }

        if ($investment <= 0) {
            return Functions::NAN();
        }

        $daysBetweenSettlementAndMaturity = DateTimeExcel\YearFrac::fraction($settlement, $maturity, $basis);
        if (!is_numeric($daysBetweenSettlementAndMaturity)) {
            //    return date error
            return $daysBetweenSettlementAndMaturity;
        }

        return (($redemption / $investment) - 1) / ($daysBetweenSettlementAndMaturity);
    }
}