The PHP session is invalid, the session cannot be passed, and the session file is not written

This problem may be encountered in a new deployment environment.
It is said on the Internet that session_auto_start=on is turned on.
If modifying session.use_trans_sid=1 does not solve the problem, then you should go to the session file directory to see if you have write permission. For
example the default session directory: /var/lib/php/session Put it Set it to 777 to solve it, or set a more reasonable permission