Why isn't the php session working on the subdomains?

[Bannana97]

Hi. I am making a website builder, and for some reason, when I make a session on site.com, then the session doesn't work on builder.site.com.

The code I am using in front of every page is:

Code: [Select]

session_set_cookie_params(1440, "/", ".red-host.org", false, false);
session_start();
header("Cache-Control: no-cache, must-revalidate");
header("Expires: Sat, 26 Jul 1997 05:00:00 GMT");

And the code that makes the session is:

Code: [Select]

session_set_cookie_params(1440, "/", ".red-host.org", false, false);
session_start();
$_SESSION[$_SESSION_NAME]="$_POST[username]";
Any advice or help would be appreciated. Thanks.

[kpac]

It's because the session_start() function uses a cookie for authentication, and the cookie is only stored for the builder.site.com path.

[Bannana97]

Oh, so how can I fix this issue?