public static function goldenRatio(): Decimal
    {
        if (null === self::$GoldenRatio) {
            self::$GoldenRatio = Decimal::fromString(
                "1.61803398874989484820458683436564"
            );
        }
        return self::$GoldenRatio;
    }
public static function goldenRatio(): Decimal
    {
        if (null === self::$GoldenRatio) {
            self::$GoldenRatio = Decimal::fromString(
                "1.61803398874989484820458683436564"
            );
        }
        return self::$GoldenRatio;
    }
public static function goldenRatio ( ) : Decimal { if ( null === self :: $ GoldenRatio ) { self :: $ GoldenRatio = Decimal :: fromString ( "1.61803398874989484820458683436564" ) ; } return self :: $ GoldenRatio ; }
Returns the Golden Ration, also named Phi.
@return Decimal
Returns the Golden Ration also named Phi .