What to do if the page appears that the web page has expired_PHP Tutorial

When using the back button of IE or history.go(-1) on the web page, what we see will be the cached page, but after using session_start, this function will force the current page not to be cached, resulting in " Warning: The page has expired."

Solution 1:

Add a sentence

after session_start

代码如下	复制代码
header("Cache-control: private");

Note that the program cannot produce any output before this.

Solution 2:

Add

before session_start

代码如下	复制代码
session_cache_limiter('private');

//Do not clear the form, only while the session is in effect

代码如下	复制代码
session_cache_limiter还有另两个参数的含义： session_cache_limiter('nocache');// 清空表单 session_cache_limiter('public'); //不清空表单，如同没有使用session

Solution 3

Change the configuration file php.ini. Place this file in

代码如下	复制代码
session.cache_limiter = nocache

changed to

代码如下	复制代码
session.cache_limiter = 或者session.cache_limiter = none

and then restart apache.

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