public static function zero() : BigRational
    {
        static $zero;

        if ($zero === null) {
            $zero = new BigRational(BigInteger::zero(), BigInteger::one(), false);
        }

        return $zero;
    }
public static function zero() : BigRational
    {
        static $zero;

        if ($zero === null) {
            $zero = new BigRational(BigInteger::zero(), BigInteger::one(), false);
        }

        return $zero;
    }
public static function zero ( ) : BigRational { static $ zero ; if ( $ zero === null ) { $ zero = new BigRational ( BigInteger :: zero ( ) , BigInteger :: one ( ) , false ) ; } return $ zero ; }
Returns a BigRational representing zero.

@return BigRational
Returns a BigRational representing zero .