新手有几个小问题求助大家!
首先说明一下情况,我写的PHP的基本功能有显示目录下文件,可以上传下载,可以点击查看,可以返回上一目录。
1,header下载功能只能在根目录下载文件,根目录下子目录里的文件下载不了,怎么改才能下载子目录下的东西?
2,怎么创建一个按钮或链接,使得点击后退为上一个页面。
3,怎么限制只能查看根目录下的东西,不能返回根目录的上一级目录。
希望高手用代码指点,文字说明我看了还是不会写.......回答就有分!
------解决方案--------------------
解决不了,回一帖,希望有高人来指点,我也想学,看了几天实在看不懂……
------解决方案--------------------
2:这个是要分页的。。。
------解决方案--------------------
你打算让人家给你写一个吗?
你贴出你需要修改的代码,让大伙提提意见才对
------解决方案--------------------
把代码贴出来吧
------解决方案--------------------
if(!empty($_GET[fn])){
//---------------------------------------下载--------------------------------------------------
$fn=$_GET['fn'];
$basename=pathinfo($fn,PATHINFO_BASENAME);
ob_end_clean();
header('Content-Encoding: none');
header('Content-Type: text/plain');
header('Content-Length: '.filesize($fn));
header('Content-Disposition: attachment; filename="'.$basename.'"');
readfile($fn);
exit();
}

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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