Session disappears on pages
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I am having problems with keeping a session active in the home directory of my website. 

I have a file in /login.php where the session is set. Then if I navigate to /index.php and print_R($_SESSION), it shows it, then I go to gallery.php and it is gone. Same is true in reverse order: it appears if I go to gallery.php first then disappears in index.php.

Im thinking it might be the php.ini file? Thanks for any help
Steve