PHP

ini_set php

/**
 Change the configuration option value to $value.
 the php config will be changed only during the execution of the php script
*/
ini_set ( $option, $value );

php ini_set

// Now server will keep session data for 2 hour

ini_set('session.gc_maxlifetime', 7200);

// All clients will remember their session id for EXACTLY 2 hour

session_set_cookie_params(7200);