subtract.php

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<?php

namespace Complex;

if (!function_exists(__NAMESPACE__ . '\\subtract')) {
    function subtract(...$complexValues): Complex
    {
        if (count($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');
            }

            $real = $result->getReal() - $complex->getReal();
            $imaginary = $result->getImaginary() - $complex->getImaginary();

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

        return $result;
    }
}