I am using same login information for three sites at different hosting servers. I am using same database for three of them but i just want if i am login at one site and then move to second site then my i should be already loged in. how can i pass my session value from one site to other?

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I don't think you can do that with $_SESSION, but I may be wrong. However, Google seems to be able to do it with all its different apps. How about saving login data in the DB and using that?

I came across this while searching "cross domain sessions php":