The cookie name "Hello + world" contains invalid characters.
Array
(
    [0] => Set-Cookie: PHPSESSID=df67e211d37a97ec16383ddc5eb50100; path=/
    [1] => Expires: Thu, 19 Nov 1981 08:52:00 GMT
    [2] => Cache-Control: no-store, no-cache, must-revalidate
    [3] => Pragma: no-cache
    [4] => Content-Type: text/plain; charset=utf-8
)
shutdown