divideby.php

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<?php

namespace Complex;

if (!function_exists(__NAMESPACE__ . '\\divideby')) {
    function divideby(...$complexValues): Complex
    {
        if (count($complexValues) < 2) {
            throw new \Exception('This function requires at least 2 arguments');
        }

        $base = array_shift($complexValues);
        $result = clone Complex::validateComplexArgument($base);

        foreach ($complexValues as $complex) {
            $complex = Complex::validateComplexArgument($complex);

            if ($result->isComplex() && $complex->isComplex() &&
                $result->getSuffix() !== $complex->getSuffix()) {
                throw new Exception('Suffix Mismatch');
            }
            if ($complex->getReal() == 0.0 && $complex->getImaginary() == 0.0) {
                throw new \InvalidArgumentException('Division by zero');
            }

            $delta1 = ($result->getReal() * $complex->getReal()) +
                ($result->getImaginary() * $complex->getImaginary());
            $delta2 = ($result->getImaginary() * $complex->getReal()) -
                ($result->getReal() * $complex->getImaginary());
            $delta3 = ($complex->getReal() * $complex->getReal()) +
                ($complex->getImaginary() * $complex->getImaginary());

            $real = $delta1 / $delta3;
            $imaginary = $delta2 / $delta3;

            $result = new Complex(
                $real,
                $imaginary,
                ($imaginary == 0.0) ? null : max($result->getSuffix(), $complex->getSuffix())
            );
        }

        return $result;
    }
}