session expire help

[ljayz]

i want my script to automatically expire session in a given period of time e.g 5mins (as a test). my problem is when ive set session_cache_e xpire(5); in my script, run it and wait for about 6-10mins then click a link that has the particular session it still dont expire. i have also tried ini_set(session .cache_expire, '5'); but still got no expired session. in php.ini session.cache_e xpire is set to 30. i have no access to php.ini. any idea guys on how to do this?

[vssp]

session_cache_l imiter('private ');
$cache_limiter = session_cache_l imiter();

/* set the cache expire to 30 minutes */
session_cache_e xpire (30);
$cache_expire = session_cache_e xpire();

/* start the session */

session_start() ;
// Unset all of the session variables.
session_unset() ;
// Finally, destroy the session.
session_destroy ();