ComplexOperations.php

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<?php

namespace PhpOffice\PhpSpreadsheet\Calculation\Engineering;

use Complex\Complex as ComplexObject;
use Complex\Exception as ComplexException;
use PhpOffice\PhpSpreadsheet\Calculation\Functions;

class ComplexOperations
{
    public static function IMDIV($complexDividend, $complexDivisor)
    {
        $complexDividend = Functions::flattenSingleValue($complexDividend);
        $complexDivisor = Functions::flattenSingleValue($complexDivisor);

        try {
            return (string) (new ComplexObject($complexDividend))->divideby(new ComplexObject($complexDivisor));
        } catch (ComplexException $e) {
            return Functions::NAN();
        }
    }

    public static function IMSUB($complexNumber1, $complexNumber2)
    {
        $complexNumber1 = Functions::flattenSingleValue($complexNumber1);
        $complexNumber2 = Functions::flattenSingleValue($complexNumber2);

        try {
            return (string) (new ComplexObject($complexNumber1))->subtract(new ComplexObject($complexNumber2));
        } catch (ComplexException $e) {
            return Functions::NAN();
        }
    }

    public static function IMSUM(...$complexNumbers)
    {
        // Return value
        $returnValue = new ComplexObject(0.0);
        $aArgs = Functions::flattenArray($complexNumbers);

        try {
            // Loop through the arguments
            foreach ($aArgs as $complex) {
                $returnValue = $returnValue->add(new ComplexObject($complex));
            }
        } catch (ComplexException $e) {
            return Functions::NAN();
        }

        return (string) $returnValue;
    }

    public static function IMPRODUCT(...$complexNumbers)
    {
        // Return value
        $returnValue = new ComplexObject(1.0);
        $aArgs = Functions::flattenArray($complexNumbers);

        try {
            // Loop through the arguments
            foreach ($aArgs as $complex) {
                $returnValue = $returnValue->multiply(new ComplexObject($complex));
            }
        } catch (ComplexException $e) {
            return Functions::NAN();
        }

        return (string) $returnValue;
    }
}