How to set lifetime of session

Question

How to set session lifetime in PHP? I Want to set it to forever as long as the request is exist. The request is AJAX. My PHP code that handle AJAX request is:

Answer 1

Set following php parameters to same value in seconds:

session.cookie_lifetime
session.gc_maxlifetime

in php.ini, .htaccess or for example with

ini_set('session.cookie_lifetime', 86400);
ini_set('session.gc_maxlifetime', 86400);

for a day.

Links:

http://www.php.net/manual/en/session.configuration.php

http://www.php.net/manual/en/function.ini-set.php