How is

    $number = new Number(6.9);
    echo $number->ceiling()              // 7
            ->max(array(5, 9, 49.1)) // 49.1
            ->floor()                // 49
            ->sqrt()                 // Value
            ->value();               // Get raw value rather    than string

    sqrt(
        floor(
            max(
                5, 9, 49.1, ceil(6.9)
            )
        )
    )