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Sessions working differently with and without WWW in url

I've used the Codeigniter sessions library for user authentication.

Everything was working fine,
but i now noticed that sessions created by a page on http://mysite.com are not being recognized by pages on http://www.mysite.com

Seems like this problems has been present from the beginning. I could just notice it now.

Can someone who had the same problem and had solved it, please help me?

Well... www is actually a subdomain, and your session probably has valability only for the domain. So, in the config.php you should change the name of the cookie_domain parameter from something like:

PHP Code:
$config['cookie_domain']    = 'yourdomain.com'


PHP Code:
$config['cookie_domain']    = '.yourdomain.com'

(notice the dot...)

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