Vendor/phpspreadsheet/phpoffice/phpspreadsheet/src/PhpSpreadsheet/Calculation/Financial.php
public static function DOLLARDE($fractional_dollar = null, $fraction = 0)
    {
        $fractional_dollar = Functions::flattenSingleValue($fractional_dollar);
        $fraction = (int) Functions::flattenSingleValue($fraction);

        // Validate parameters
        if ($fractional_dollar === null || $fraction < 0) {
            return Functions::NAN();
        }
        if ($fraction == 0) {
            return Functions::DIV0();
        }

        $dollars = floor($fractional_dollar);
        $cents = fmod($fractional_dollar, 1);
        $cents /= $fraction;
        $cents *= pow(10, ceil(log10($fraction)));

        return $dollars + $cents;
    }
public static function DOLLARDE($fractional_dollar = null, $fraction = 0)
    {
        $fractional_dollar = Functions::flattenSingleValue($fractional_dollar);
        $fraction = (int) Functions::flattenSingleValue($fraction);

        // Validate parameters
        if ($fractional_dollar === null || $fraction < 0) {
            return Functions::NAN();
        }
        if ($fraction == 0) {
            return Functions::DIV0();
        }

        $dollars = floor($fractional_dollar);
        $cents = fmod($fractional_dollar, 1);
        $cents /= $fraction;
        $cents *= pow(10, ceil(log10($fraction)));

        return $dollars + $cents;
    }
DOLLARDE.

Converts a dollar price expressed as an integer part and a fraction
part into a dollar price expressed as a decimal number.
Fractional dollar numbers are sometimes used for security prices.

Excel Function:
DOLLARDE(fractional_dollar,fraction)

@category Financial Functions

@param float $fractional_dollar Fractional Dollar
@param int $fraction Fraction

@return float