session_cache_e xpire is the wrong function. It sets the lifetime of session pages stored on the client's computer (think "web page cache"). It only operates when session.cache_l imiter is set to something other than its default of nocache and has NO VALUE for timing out a session. It's only value is for convenience when surfing a session-controlled web site. Generally (IMHO), you shouldn't be using it at all.

If you want...