log10.php

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<?php

namespace Complex;

if (!function_exists(__NAMESPACE__ . '\\log10')) {
    function log10($complex): Complex
    {
        $complex = Complex::validateComplexArgument($complex);

        if (($complex->getReal() == 0.0) && ($complex->getImaginary() == 0.0)) {
            throw new \InvalidArgumentException();
        } elseif (($complex->getReal() > 0.0) && ($complex->getImaginary() == 0.0)) {
            return new Complex(\log10($complex->getReal()), 0.0, $complex->getSuffix());
        }

        return ln($complex)
            ->multiply(\log10(Complex::EULER));
    }
}