如先浏览a.php文件，里边写入一个会话值。
再浏览b.php，得到a.php写入的会话值。为空！
为什么呢？在本地机器上测试非常正常。一上传服务器就完了。
PHPINFO的session信息
session.save_path D:/hosting/user/html/temp D:/hosting/user/html/temp
这个文件夹可读可写。
当浏览a.php页时，产生一个有大小的文件，也保存了会话值。
当浏览b.php页时，产生一个大小为0的文件。拿不到？什么原因？
sessionSession Support enabled Registered save handlers files user Registered serializer handlers php php_binary wddx Directive Local Value Master Value session.auto_start Off Off session.bug_compat_42 On On session.bug_compat_warn On On session.cache_expire 180 180 session.cache_limiter nocache nocache session.cookie_domain no value no value session.cookie_httponly Off Off session.cookie_lifetime 0 0 session.cookie_path / / session.cookie_secure Off Off session.entropy_file no value no value session.entropy_length 0 0 session.gc_divisor 100 100 session.gc_maxlifetime 1440 1440 session.gc_probability 1 1 session.hash_bits_per_character 4 4 session.hash_function 0 0 session.name PHPSESSID PHPSESSID session.referer_check no value no value session.save_handler files files session.save_path D:/hosting/user/html/temp session.serialize_handler php php session.use_cookies On On session.use_only_cookies Off Off session.use_trans_sid 1 1
a.php
<?phpsession_start();?><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>session set</title></head><body><?php$_SESSION['session_value'] = 'value';var_dump($_SESSION);phpinfo();?></body></html>
这个文件正常，可以打印出会话值。
b.php
<?phpsession_start();?><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>session get</title></head><body><?phpvar_dump($_SESSION);?></body></html>
这个什么也没有
回复讨论(解决方案)
var_dump($_SESSION['session_value']);
你服务器上也是这个？
session.save_path D:/hosting/user/html/temp
在你本地可能是能找到的,你服务器上有这个目录吗?
确实表示上面的代码没问题.本地可以测试.服务器暂时没测.可以考虑一下二楼的建议.
a与b有没有跨域呢？
你服务器上也是这个？
session.save_path D:/hosting/user/html/temp
在你本地可能是能找到的,你服务器上有这个目录吗?
在服务器我专门设置这个是万能文件夹，可写可一切一切的
var_dump($_SESSION['session_value']);
也是不行，都没有值……
什么原因？服务器是IIS。但不可能的呀，会这样，本地也虚拟了相同环境去测试，但还是这个样子，痛苦死我了
两个页我都session_id(1)之后就可以显示值了，但是这样多用户可不行了
浏览器的问题吧？
浏览器有什么问题？
我用IE6到IE9都是一个样……没变化。
session_id(SID);
session_start();
session_id(SID);
session_start();
SID是常量 ？
擦，你解决了吗，我今天刚遇到这个问题，搞了一天还是没能解决！
比较讨厌php这个session的问题。
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How can you optimize PHP session performance?Apr 23, 2025 am 12:13 AMMethods to optimize PHP session performance include: 1. Delay session start, 2. Use database to store sessions, 3. Compress session data, 4. Manage session life cycle, and 5. Implement session sharing. These strategies can significantly improve the efficiency of applications in high concurrency environments.
What is the session.gc_maxlifetime configuration setting?Apr 23, 2025 am 12:10 AMThesession.gc_maxlifetimesettinginPHPdeterminesthelifespanofsessiondata,setinseconds.1)It'sconfiguredinphp.iniorviaini_set().2)Abalanceisneededtoavoidperformanceissuesandunexpectedlogouts.3)PHP'sgarbagecollectionisprobabilistic,influencedbygc_probabi
How do you configure the session name in PHP?Apr 23, 2025 am 12:08 AMIn PHP, you can use the session_name() function to configure the session name. The specific steps are as follows: 1. Use the session_name() function to set the session name, such as session_name("my_session"). 2. After setting the session name, call session_start() to start the session. Configuring session names can avoid session data conflicts between multiple applications and enhance security, but pay attention to the uniqueness, security, length and setting timing of session names.
How often should you regenerate session IDs?Apr 23, 2025 am 12:03 AMThe session ID should be regenerated regularly at login, before sensitive operations, and every 30 minutes. 1. Regenerate the session ID when logging in to prevent session fixed attacks. 2. Regenerate before sensitive operations to improve safety. 3. Regular regeneration reduces long-term utilization risks, but the user experience needs to be weighed.
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What is the main purpose of using sessions in PHP?Apr 22, 2025 pm 05:25 PMThe main purpose of using sessions in PHP is to maintain the status of the user between different pages. 1) The session is started through the session_start() function, creating a unique session ID and storing it in the user cookie. 2) Session data is saved on the server, allowing data to be passed between different requests, such as login status and shopping cart content.
How can you share sessions across subdomains?Apr 22, 2025 pm 05:21 PMHow to share a session between subdomains? Implemented by setting session cookies for common domain names. 1. Set the domain of the session cookie to .example.com on the server side. 2. Choose the appropriate session storage method, such as memory, database or distributed cache. 3. Pass the session ID through cookies, and the server retrieves and updates the session data based on the ID.
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