PHP - platnosť $_SESSION

V konfiguračním souboru: php.ini

Někde tady:

; Define the probability that the 'garbage collection' process is started
; on every session initialization.
; The probability is calculated by using gc_probability/gc_divisor,
; e.g. 1/100 means there is a 1% chance that the GC process starts
; on each request.

; This is disabled in the Debian packages, due to the strict permissions
; on /var/lib/php4. Instead of setting this here, see the cronjob at
; /etc/cron.d/php4, which uses the session.gc_maxlifetime setting below
;session.gc_probability = 0
session.gc_divisor = 100

; After this number of seconds, stored data will be seen as 'garbage' and
; cleaned up by the garbage collection process.
session.gc_maxlifetime = 1440

RTFM!
http://www.php.net/manual/en/function.session-cach e-expire.php

nebo taky s pomocí session.gc_maxlifetime

PS: pozdě

Platnost session sa myslim ze da aj menit:

ini_set('session.gc_maxlifetime', 3600); // 1 hodina

a ziskat cez:

ini_get('session.gc_maxlifetime');

ehm: neda sa ziskat aj cez funkciu:

session_cache_expire()

a nastavit tiez cez to:

session_cache_expire(30) // 30 minut

To som si len vygooglil... neskusal som...