exp.php

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<?php

namespace Complex;

if (!function_exists(__NAMESPACE__ . '\\exp')) {
    function exp($complex): Complex
    {
        $complex = Complex::validateComplexArgument($complex);

        if (($complex->getReal() == 0.0) && (\abs($complex->getImaginary()) == M_PI)) {
            return new Complex(-1.0, 0.0);
        }

        $rho = \exp($complex->getReal());

        return new Complex(
            $rho * \cos($complex->getImaginary()),
            $rho * \sin($complex->getImaginary()),
            $complex->getSuffix()
        );
    }
}