session_cache_expire

(PHP 4 >= 4.2.0, PHP 5, PHP 7, PHP 8)

session_cache_expireGet and/or set current cache expire

Description

session_cache_expire(?int $value = null): int|false

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).

Parameters

value

If value is given and not null, the current cache expire is replaced with value.

Note: Setting value is of value only, if session.cache_limiter is set to a value different from nocache.

Return Values

Returns the current setting of session.cache_expire. The value returned should be read in minutes, defaults to 180. On failure to change the value, false is returned.

Changelog

Version Description
8.0.0 value is nullable now.

Examples

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";
?>

See Also

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User Contributed Notes 2 notes

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175
Anonymous
16 years ago
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.
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0
tuncdan dot ozdemir dot peng at gmail dot com
12 days ago
Using PHP 8.2

session_start();

$result1 = session_cache_expire( 30 ); // setter, results in Warning: Session cache expiration cannot be changed when a session is active in ...

$result2 = session_cache_expire(); // getter

var_dump( $result1, $result2 ); // prints out: int(180) int(180) [note: 180 is the default value]

Because the session was already started, cache expiration could not be changed (warning message). However, the return value is NOT false, it is still the original, unchanged value!

So I do not know what is considered a failure to change the value as per the documentation (`On failure to change the value, false is returned.`).
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