PHP 8.3.0 RC 6 available for testing

session_cache_expire

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

session_cache_expire返回/设置当前缓存的到期时间

说明

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

session_cache_expire() 返回 session.cache_expire 的设定值。

请求开始的时候,缓存到期时间会被重置为 180,并且保存在 session.cache_expire 配置项中。 因此,针对每个请求,需要在 session_start() 函数调用之前 调用 session_cache_expire() 来设置缓存到期时间。

参数

value

如果指定 value 且不为 null,就使用 value 的值替换当前缓存到期时间。

注意: 仅在 session.cache_limiter 的设置值 不是 nocache 的时候, 才可以设置 value 参数。

返回值

返回 session.cache_expire 的当前设置值, 以分钟为单位,默认值是 180 (分钟)。如果更改值失败,则返回 false

更新日志

版本 说明
8.0.0 value 现在可以为 null。

示例

示例 #1 session_cache_expire() 示例

<?php

/* 设置缓存限制为 “private” */

session_cache_limiter('private');
$cache_limiter = session_cache_limiter();

/* 设置缓存过期时间为 30 分钟 */
session_cache_expire(30);
$cache_expire = session_cache_expire();

/* 开始会话 */

session_start();

echo
"The cache limiter is now set to $cache_limiter<br />";
echo
"The cached session pages expire after $cache_expire minutes";
?>

add a note

User Contributed Notes 3 notes

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158
Anonymous
15 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.
up
-18
lance_rushing at hotmail dot com
18 years ago
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.
up
-25
WooDzu
10 years ago
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
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