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php session does not carry across subdomains

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Last Modified: 2013-11-10
I have an issue where I need a script to read the same session no matter what subdomain the person is using. Anotherwords, I need the person to stay logged in even if they jump subdomains. I tried setting the below at the top of every page but it still doesn't work. When I try to read the session on a new subdomain it just creates a brand new one.
ini_set("session.cookie_domain", ".domain.com");

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