ln.php

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<?php

namespace Complex;

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

        if (($complex->getReal() == 0.0) && ($complex->getImaginary() == 0.0)) {
            throw new \InvalidArgumentException();
        }

        return new Complex(
            \log(rho($complex)),
            theta($complex),
            $complex->getSuffix()
        );
    }
}