(PHP 4 >= 4.2.0, PHP 5, PHP 7)
session_cache_expire — Return current cache expire
$new_cache_expire
] )session_cache_expire() returns the current setting of session.cache_expire.
The cache expire is reset to the default value of 180 stored in session.cache_expire at request startup time. Thus, you need to call session_cache_expire() for every request (and before session_start() is called).
new_cache_expire
If new_cache_expire is given, the current cache
expire is replaced with new_cache_expire.
Note: Setting
new_cache_expireis of value only, if session.cache_limiter is set to a value different from nocache.
Returns the current setting of session.cache_expire. The value returned should be read in minutes, defaults to 180.
Example #1 session_cache_expire() example
<?php
/* set the cache limiter to 'private' */
session_cache_limiter('private');
$cache_limiter = session_cache_limiter();
/* set the cache expire to 30 minutes */
session_cache_expire(30);
$cache_expire = session_cache_expire();
/* start the session */
session_start();
echo "The cache limiter is now set to $cache_limiter<br />";
echo "The cached session pages expire after $cache_expire minutes";
?>
The manual probably doesn't stress this enough:
** This has nothing to do with lifetime of a session **
Whatever you set this setting to, it won't change how long sessions live on your server.
This only changes HTTP cache expiration time (Expires: and Cache-Control: max-age headers), which advise browser for how long it can keep pages cached in user's cache without having to reload them from the server.
I've encountered the same problem of loosing focus when using IE and a javascript window.location.refresh/replace().
After fusing around I found that a <meta http-equiv="refresh" content="600"> works without move the focus on the parent frame's form. The down side is loading up the browser history and an annoying 'click' in IE on the page load.
Just to make things clear. If session.cache_limiter is set to private the following header will be sent in HTTP response:
Cache-Control private, max-age=10800, pre-check=10800
Where 10800 is the amount of seconds - default value of 180 minutes set by session.cache_expire which you are enabled to change with session_cache_expire() on run-time
