session_status() 在重新加载时不返回 [英] session_status() returns none on reload

问题描述

我已经看过这个 相同 相反 问题及其 OP 代码示例对我来说似乎非常好.我也读过(包括 PHP 文档)可以在 PHP >= 5.4 上使用 session_status() 检查会话，在调用 session_start() 之前这样做应该没问题code> 以确定它是否已经存在.

I have already seen this identical opposite question and its OP code sample seems perfectly fine to me. I've also read (including PHP docs) that session can be checked with session_status() on PHP >= 5.4 and it should be fine to do so before calling session_start() to determine if it already exists.

现在，我在 CentOS 7.10 机器上使用 PHP 5.4.16 并且 session_status() 总是为我返回 1 (PHP_SESSION_NONE)，只有在我重新加载时带有此示例的页面:

Now, I'm using PHP 5.4.16 on a CentOS 7.10 machine and the session_status() always returns 1 (PHP_SESSION_NONE) for me, only when I reload the page with this example:

<?php
$status = session_status();
session_start();
echo "The session status is : $status";

我希望它在我重新加载页面时返回 PHP_SESSION_ACTIVE (2)(并且我没有在清除缓存的情况下强制重新加载).我使用的是最新的 Chrome 版本，页面嵌入在一个虚拟主机中，通过端口 8443 使用 HTTPS.

I expect it returns PHP_SESSION_ACTIVE (2) when I reload page (and I'm not forcing-reload with cache clear). I'm using latest Chrome version, and the page is embedded inside a virtual host with HTTPS over port 8443.

我已经使用 php --version 和 phpinfo() 脚本检查了 PHP 版本，以丢弃任何版本冲突以防万一，它们是相同的.此外，当我访问会话脚本页面时，服务器会在 /var/lib/php/session 目录中创建空文件.我没有更改会话或任何内容的默认 PHP 设置.

I've checked the PHP version with both php --version and via phpinfo() script to discard any version conflict just in case, and they're same. Additionally, when I visit the session script page, the server creates empty files at /var/lib/php/session directory. I didn't change default PHP settings for session or anything.

说清楚:session_status() 如果之后在同一个脚本执行时检查，则工作正常(会话状态为:2)，但自然我不是对此感兴趣，因为我想首先检查会话是否存在.

To make it clear: the session_status() works fine if checked afterwards on same script execution (The session status is : 2), but naturally I'm not interested in that since I want to check if session exist in first place.

可能有什么问题?

推荐答案

您的 session_status 将始终为 PHP_SESSION_NONE，直到您在当前请求的生命周期内调用 session_start.如果您在之前的某个请求中已经开始"，这并不重要.一个会话:你需要重新开始"它，恢复以前开始的会话.这是通过 cookie 完成的.

Your session_status will always be PHP_SESSION_NONE until you call session_start in the lifetime of the current request. It does not matter if on some previous request you "already started" a session: you need to "re-start" it, to resume a previously started session. This is done via cookies.

如果您的意图是仅当用户过去已经执行了启动会话的某些操作(例如，他们之前已经登录)并且您想恢复会话但不想开始新会话时才开始会话，那么您可以简单地检查 if (isset($_COOKIE['PHPSESSID'])).

If your intent is to start a session only if the user already did something in the past that started a session (eg. they already logged in previously) and you want to resume a session but not start a new one, then you could simply check if (isset($_COOKIE['PHPSESSID'])).

如果您知道大多数用户不需要会话，并且您希望避免 cookie 和会话所涉及的开销，但仍然能够处理需要会话的情况，这可能会很有用.

This may be beneficial if you know most of your users won't need a session, and you want to avoid cookies and the overhead involved with a session, but still be able to handle the cases when a session is needed.

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