public static function ref(string $path, string $separator = null): ValueReference
    {
        return new ValueReference($path, $separator);
    }
public static function ref(string $path, string $separator = null): ValueReference
    {
        return new ValueReference($path, $separator);
    }
public static function ref ( string $ path , string $ separator = null ) : ValueReference { return new ValueReference ( $ path , $ separator ) ; }
Create parameter ref.

@param string      $path
@param string|null $separator

@return  ValueReference

@since  3.5.1
Create parameter ref .