如何判断会话是否处于活动状态? [英] How to tell if a session is active?

问题描述

根据请求，您可以通过几种不同的方式来判断会话是否已开始，例如:

Per request, there are a few different ways that you can tell whether or not a session has been started, such as:

$isSessionActive = (session_id() != "");

或者:

$isSessionActive = defined('SID');

但是，如果您启动会话然后将其关闭，它们都将失败； session_id()将返回上一个会话的ID，而SID将被定义.同样，如果您已经有一个活动会话，则此时调用session_start()将生成一个E_NOTICE.是否有一种明智的方法来检查会话当前是否处于活动状态，而不必求助于输出缓冲，关闭运算符(@session_start())或其他类似hacky的东西?

However, these both fail if you start a session, then close it; session_id() will return the prior session's ID, while SID will be defined. Likewise, calling session_start() at this point will generate an E_NOTICE if you already have a session active. Is there a sane way to check if a session is currently active, without having to resort to output buffering, the shut-up operator (@session_start()), or something else equally as hacky?

我写了一个补丁，试图使此功能包含在PHP中: http://bugs.php.net/bug.php?id=52982

I wrote a patch to try to get this functionality included in PHP: http://bugs.php.net/bug.php?id=52982

编辑8/29/2011:向PHP 5.4添加了新功能来解决此问题:通过新功能session_status公开会话状态"

EDIT 8/29/2011: New function added to PHP 5.4 to fix this: "Expose session status via new function, session_status"

// as of 8/29/2011
$isSessionActive = (session_status() == PHP_SESSION_ACTIVE);

编辑12/5/11: session_status()在PHP手册上.

EDIT 12/5/11: session_status() on the PHP manual.

推荐答案

查看对原始问题的修改；基本上，PHP 5.4和更高版本现在具有一个名为 session_status() 的函数来解决此问题！

See edits to the original question; basically, PHP 5.4 and above now has a function called session_status() to solve this problem!

通过新功能session_status公开会话状态"(SVN修订版315745 )

如果您需要PHP 5.4之前的版本中的此功能，请参见 hakre的答案.

If you need this functionality in a pre-PHP 5.4 version, see hakre's answer.

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