log2.php

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<?php
 
namespace Complex;
 
if (!function_exists(__NAMESPACE__ . '\\log2')) {
    function log2($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(\log($complex->getReal(), 2), 0.0, $complex->getSuffix());
        }
 
        return ln($complex)
            ->multiply(\log(Complex::EULER, 2));
    }
}