[Private Series] All kinds of strange problems encountered in daily PHP

1. The session of the previous page cannot be obtained from the next page of php.

Process:

1. Generate a token, store it in the server session, and submit the token to the front-end page;
2. When the front-end submits the form, submit the token at the same time, and the session in the server is empty;

Possibilities:

The id of the session is stored in the front-end page cookie, but when submitted to the back-end, the id corresponding to the session disappears or an error occurs;

Solution:

Study for a day, hits and misses, may be good or bad in different browsers, just when it crashes, everything seems to be fine but then hangs again...
Later, it was speculated that security drills were being performed at that time. Once the session exceeded the number, it was cleared, so the session corresponding to the cookie disappeared. Of course, this speculation was extremely unreliable and failed properly...
Upgrading php to the latest version is still wrong...

Finally, tmd, it is normal to delete this sentence

session_set_cookie_params(0,NULL,NULL,TRUE); //cookies must use httponly