我现在的理解是:
一开始服务器端通过接口把sessionid传给客户端,客户端(android)浏览整个应用都通过url的方式带着sessionid与服务器进行交互。
问题是:
服务器端是用php做的,客户端发送请求时,我获取它的sessionid,怎么来判断这个id是否有效,是否已经过期了呢?
查到有人会在数据库里生成一堆的sessionid,并记录它们的使用状态。然后客户端发送请求时,就会去检查这个sessionid是否有效,如果无效,就会给其分配一个没有用过的sessionid.
请大牛们指点迷津。到底该如何实现客户端和服务器端传递sessionid,谢谢。
回复讨论(解决方案)
sessionid 是在服务器端验证的 你要在客户端传递是个什么意思?如果你非要带个sessionid 可以使用$HTTP_SESSION_VARS 传递给客户端.其实还不如自己实现一个加密串呢...
找到传智播客PHP视频教程117讲 session原理笔记,有关sessionid的工作机制是这么描述的,希望对你有帮助:
当浏览器A去访问一个有打开了session机制的php1文件时,session文件会创建,同时会将该session文件的id以cookie的形式发送给浏览器(session文件的id号可以session_id()这个函数来获得)。当浏览器A没有关闭(会话没有结束),反而去访问另一个也开启session机制的php2文件时,那么该sessionid也会跟着http协议从浏览器发送到服务器上,访问到之前创建的session文件,将相关内存也保存到该session文件内。
当我们开启了另一个浏览器B,也就是创建了另一个会话,那么该浏览器访问一个带有开启session机制的网页,会另外生成一个新的session文件,并将该session文件id号以cookie的形式传递给浏览器B.
可以这么理解,一个会话对应一个sessionid。
希望能够帮助到你!
http://fushidian.blog.163.com/blog/static/567656992010102522713846/

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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