What to do if php session jump fails

php session jump failure can only be solved by: 1. Check the access permissions of "session.save_path" and modify it; 2. Modify the settings of "session.use_trans_sid" and "session.use_only_cookies".

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Generally, cross-page session failure occurs The situation is basically related to the configuration of PHP:

1. session.save_path has insufficient access rights, or there is a problem with the path;

2. Setting issues with session.use_trans_sid and session.use_only_cookies.

Check php.ini:

Found that the path is normal and the file The session value is also accurately recorded in it, so session.save_path is no problem.

## Then check

session.use_trans_sid and find:

## Explain that there are two ways to pass session, one is based on cookie delivery, and the other is based on URL delivery.

Cookie

transfer means saving session information on the client through cookies, and then automatically bringing the cookie information when sending a request to the server , so that the server can read it. This is a commonly used method.

URL transfer is to automatically add session information after clicking the jump link, such as a.php?sessid=..., and then automatically $ on the new page _GET['sessid'] to read. This process is automatic and hidden, as imperceptible as passing it through cookies.

And

session.use_trans_sid indicates whether to use the URL to pass the session, so if the session.use_trans_sid value is 0, and the user browser If cookies are disabled, the session will become invalid across pages.

But after setting session.use_trans_sid to 1, the session still fails, so you need to check session.use_only_cookies, found:

# session.use_only_cookies indicates whether to only use cookies to pass session, so if it is set to 1, evensession.use_trans_sid=1, URL passing is still not used.

# Therefore, session. use_trans_sid=1, session.use_only_cookies=0, the URL delivery method can be enabled.

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