public static function isset(string $index):bool
    {
        return (isset(self::$framework_paths[$index])? true : false);
    }
public static function isset(string $index):bool
    {
        return (isset(self::$framework_paths[$index])? true : false);
    }
public static function isset ( string $ index ) : bool { return ( isset ( self :: $ framework_paths [ $ index ] ) ? true : false ) ; }
Check if element is isset in path framework
@param string $index Element index
@return bool The result of isset (false: not isset; true : is isset)
Check if element is isset in path framework