How to Session timeout for specific WebPage ?

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Hello there... I would like to know how to set the session timeout time
locally and not globally in the php.ini file.
I do that as it is ine but doesn't seem to do anything
/* set the cache limiter to 'private' */

$cache_limiter = session_cache_limiter();

/* set the cache expire to 1 minutes */
$cache_expire = session_cache_expire();
I enter 1 minute for testing purposes....
 - Also It would be helpfull to let me know how I am going to verify that
the session has been expired....
 - Is there any way to automatically refresh the page when the session has
expired and let the user know ?
 - Is there any good site that I can find tutorials or examples for this
                         < - > Thank you !!!< /- >

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