Is it possible to use PHP sessions reliably? I get very inconsistent results. I register session vars after a password check. I use session_start at the top of every file. I watch the /tmp directory for session files. Within a few random page transitions the session data inside the registered variables gets emptied. (for instance, $userid=$HTTP_SESSION_VARS['userid']; no longer returns the registered variable userid). The session file is still there, but the value reported by session_id() is different than the sessionid portion of any session filename. At this point session_destroy doesn't delete the session file either, so apparently it doesn't know which session it is really in. I've bought two books (Wrox and Vis Quickpro) and neither of these books addresses possible session flakiness. So, is it my flaky code, IE's cookie hijinks or maybe that PHP is not really ready to do robust session management? BTW: I am using PHP ver 4.0.6 (patched for file upload bug) on Linux/Apache/MySQL
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