MathPHP\Functions\Special::signum PHP 메소드

https://en.wikipedia.org/wiki/Sign_function { -1 if x < 0 sgn(x) = { 0 if x = 0 { 1 if x > 0

public static signum ( float $x ) : integer
$x	float
리턴	integer

    public static function signum(float $x) : int
    {
        if ($x == 0) {
            return 0;
        }
        return $x < 0 ? -1 : 1;
    }

Special