acosh.php

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<?php

namespace Complex;

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

        if ($complex->isReal() && ($complex->getReal() > 1)) {
            return new Complex(\acosh($complex->getReal()));
        }

        $acosh = acos($complex)
            ->reverse();
        if ($acosh->getReal() < 0.0) {
            $acosh = $acosh->invertReal();
        }

        return $acosh;
    }
}