大家好,我现在有两台阿里云ECS,都在北京区,还有一个阿里云的云数据库Memcache版。
我现在想实现共享同一域名下的session,这样我通过负载均衡随机分配到这两台服务器上,只要登录其中一台服务器即可共享登录。
然后,我是通过修改php.ini来实现把session存储到memcache上的,这些都ok了,但是现在发现一个问题是两台服务器的session并不是同步的,这是为什么呢?
服务器A:info.php
<?php session_start(); $sn = session_id(); echo $sn."\n"; echo '<pre class="brush:php;toolbar:false">'; var_dump($_SESSION); echo ''; echo "\n The A"
服务器B:info.php
<?php session_start(); $sn = session_id(); echo $sn."\n"; echo '<pre class="brush:php;toolbar:false">'; $_SESSION['1'] = 'abc'; var_dump($_SESSION); echo ''; echo "\n The B" ?>
打印结果是:服务器A
<code>jck9tkdggk9drukfnu571hbjj5 array(0) { } The A</code>
服务器B
<code>jck9tkdggk9drukfnu571hbjj5 array(1) { [1]=> string(3) "abc" } The B</code>
这是为什么呢?通过memcache的命令行得知,php已经将session存入memcache了。
求解答,谢谢。
回复内容:
大家好,我现在有两台阿里云ECS,都在北京区,还有一个阿里云的云数据库Memcache版。
我现在想实现共享同一域名下的session,这样我通过负载均衡随机分配到这两台服务器上,只要登录其中一台服务器即可共享登录。
然后,我是通过修改php.ini来实现把session存储到memcache上的,这些都ok了,但是现在发现一个问题是两台服务器的session并不是同步的,这是为什么呢?
服务器A:info.php
<?php session_start(); $sn = session_id(); echo $sn."\n"; echo '<pre class="brush:php;toolbar:false">'; var_dump($_SESSION); echo ''; echo "\n The A"
服务器B:info.php
<?php session_start(); $sn = session_id(); echo $sn."\n"; echo '<pre class="brush:php;toolbar:false">'; $_SESSION['1'] = 'abc'; var_dump($_SESSION); echo ''; echo "\n The B" ?>
打印结果是:服务器A
<code>jck9tkdggk9drukfnu571hbjj5 array(0) { } The A</code>
服务器B
<code>jck9tkdggk9drukfnu571hbjj5 array(1) { [1]=> string(3) "abc" } The B</code>
这是为什么呢?通过memcache的命令行得知,php已经将session存入memcache了。
求解答,谢谢。
session 跟 cookie 的关系要理清楚
前提是基于同一个域,获取相同的cookie,继而获取相同的sessionid,获取相同的session内容,共享session
你的例子中,打印的服务器A的结果中的id ,跟服务器B的结果中的id, jck9tkdggk9drukfnu571hbjj5
,是相同的? 还是你修饰过例子 ?

PHPsessionstrackuserdataacrossmultiplepagerequestsusingauniqueIDstoredinacookie.Here'showtomanagethemeffectively:1)Startasessionwithsession_start()andstoredatain$_SESSION.2)RegeneratethesessionIDafterloginwithsession_regenerate_id(true)topreventsessi

In PHP, iterating through session data can be achieved through the following steps: 1. Start the session using session_start(). 2. Iterate through foreach loop through all key-value pairs in the $_SESSION array. 3. When processing complex data structures, use is_array() or is_object() functions and use print_r() to output detailed information. 4. When optimizing traversal, paging can be used to avoid processing large amounts of data at one time. This will help you manage and use PHP session data more efficiently in your actual project.

The session realizes user authentication through the server-side state management mechanism. 1) Session creation and generation of unique IDs, 2) IDs are passed through cookies, 3) Server stores and accesses session data through IDs, 4) User authentication and status management are realized, improving application security and user experience.

Tostoreauser'snameinaPHPsession,startthesessionwithsession_start(),thenassignthenameto$_SESSION['username'].1)Usesession_start()toinitializethesession.2)Assigntheuser'snameto$_SESSION['username'].Thisallowsyoutoaccessthenameacrossmultiplepages,enhanc

Reasons for PHPSession failure include configuration errors, cookie issues, and session expiration. 1. Configuration error: Check and set the correct session.save_path. 2.Cookie problem: Make sure the cookie is set correctly. 3.Session expires: Adjust session.gc_maxlifetime value to extend session time.

Methods to debug session problems in PHP include: 1. Check whether the session is started correctly; 2. Verify the delivery of the session ID; 3. Check the storage and reading of session data; 4. Check the server configuration. By outputting session ID and data, viewing session file content, etc., you can effectively diagnose and solve session-related problems.

Multiple calls to session_start() will result in warning messages and possible data overwrites. 1) PHP will issue a warning, prompting that the session has been started. 2) It may cause unexpected overwriting of session data. 3) Use session_status() to check the session status to avoid repeated calls.

Configuring the session lifecycle in PHP can be achieved by setting session.gc_maxlifetime and session.cookie_lifetime. 1) session.gc_maxlifetime controls the survival time of server-side session data, 2) session.cookie_lifetime controls the life cycle of client cookies. When set to 0, the cookie expires when the browser is closed.


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