search
HomeBackend DevelopmentPHP Tutorial如何使两台ECS通过memcache共享session

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 ?

Statement
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
Explain the concept of a PHP session in simple terms.Explain the concept of a PHP session in simple terms.Apr 26, 2025 am 12:09 AM

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

How do you loop through all the values stored in a PHP session?How do you loop through all the values stored in a PHP session?Apr 26, 2025 am 12:06 AM

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.

Explain how to use sessions for user authentication.Explain how to use sessions for user authentication.Apr 26, 2025 am 12:04 AM

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.

Give an example of how to store a user's name in a PHP session.Give an example of how to store a user's name in a PHP session.Apr 26, 2025 am 12:03 AM

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

What are some common problems that can cause PHP sessions to fail?What are some common problems that can cause PHP sessions to fail?Apr 25, 2025 am 12:16 AM

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.

How do you debug session-related issues in PHP?How do you debug session-related issues in PHP?Apr 25, 2025 am 12:12 AM

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.

What happens if session_start() is called multiple times?What happens if session_start() is called multiple times?Apr 25, 2025 am 12:06 AM

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.

How do you configure the session lifetime in PHP?How do you configure the session lifetime in PHP?Apr 25, 2025 am 12:05 AM

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.

See all articles

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

Video Face Swap

Video Face Swap

Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Tools

MinGW - Minimalist GNU for Windows

MinGW - Minimalist GNU for Windows

This project is in the process of being migrated to osdn.net/projects/mingw, you can continue to follow us there. MinGW: A native Windows port of the GNU Compiler Collection (GCC), freely distributable import libraries and header files for building native Windows applications; includes extensions to the MSVC runtime to support C99 functionality. All MinGW software can run on 64-bit Windows platforms.

SAP NetWeaver Server Adapter for Eclipse

SAP NetWeaver Server Adapter for Eclipse

Integrate Eclipse with SAP NetWeaver application server.

Safe Exam Browser

Safe Exam Browser

Safe Exam Browser is a secure browser environment for taking online exams securely. This software turns any computer into a secure workstation. It controls access to any utility and prevents students from using unauthorized resources.

mPDF

mPDF

mPDF is a PHP library that can generate PDF files from UTF-8 encoded HTML. The original author, Ian Back, wrote mPDF to output PDF files "on the fly" from his website and handle different languages. It is slower than original scripts like HTML2FPDF and produces larger files when using Unicode fonts, but supports CSS styles etc. and has a lot of enhancements. Supports almost all languages, including RTL (Arabic and Hebrew) and CJK (Chinese, Japanese and Korean). Supports nested block-level elements (such as P, DIV),

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools