Assigning and Passing Sessions Variables Between Subdomains

问题

I am going to create a site that will have have multiple subdomains. For an example:

• shop.domain.com
• blog.domain.com
• news.domain.com
• account.domain.com

I would like to know if session variables can be passed between the subdomains. For an example $_SESSION['variable'] would be accessible on all of the subdomains listed above.

回答1:

You first have to make sure to store session data in a way that all hosts can access them; if they are hosted on the same machine everything is fine, otherwise you might want to use another session handler which e.g. uses a database, memcache, ... to store session data. Then you have to make sure the session id is available on all subdomains; this can be achieved by setting ini.session.cookie-domain.

For more information on sessions you should read the appropriate chapter in the fine php manual.

来源：https://stackoverflow.com/questions/6546999/assigning-and-passing-sessions-variables-between-subdomains