PHP program always prompts verification code input error solution _php instance

Today, when you put a set of programs on another server, you find that the login verification code in the background, regardless of whether the input is correct or not, always shows:

Validation code entered incorrectly

Then it started to debug.

Because the correct verification code results have been encrypted and saved in the session, all the verification code used for the input will be compared to the sessions, so as to determine whether the verification code input error!

Since it always shows: "The validation code input is wrong"

Indicates that there may be a problem saving to the result in the session. Then, the dump session, found the result is null ...

Workaround: Use Phpinfo to view session information, find the save path for the session, and then set the Write permission to it

Note: Remember to reboot Apache or IIS