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PHP Sessions across sub domains

I can't seem to get this to work. I want to be able to log in 开发者_运维百科from my main domain, and remain logged in when they go to a subdomain of the site. Whenever I go from my main domain to a subdomain, I'm immediately logged out.

I've tried changing session.cookie_domain in php.ini with no avail, as well as trying

ini_set('session.cookie_domain','.site.com' );

and this in .htaccess as well

php_value session.cookie_domain .site.com

How can I have sessions go between subdomains?

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1. stick with ini_set(); or, even better, with session_set_cookie_params()

2. debug your code

• verify your settings, if they actually were set, by outputting them
• verify actual HTTP headers sent by your server to the client.
• verify actual HTTP headers sent by your browser to the server.

Sessions are not a black box; it's just a combination of a few very simple mechanisms such as HTTP cookies, so check every part of it.