How to solve the problem that php programs always prompt for incorrect input of CAPTCHA code

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Today, when I put a set of programs to another server to execute, I found that the login verification code in the background always shows whether it is entered correctly or not:

Incorrect input of CAPTCHA code

And then debug started.

Because the correct CAPTCHA result has been encrypted and saved in session, all the CAPTCHA used for input will be compared with the CAPTCHA in session to determine whether the CAPTCHA is entered incorrectly!

Since it always says: "CAPTCHA is entered incorrectly"

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

Solution: use phpinfo to view session information, find out the save path of session, and then set the write permission to it.

Note: remember to restart apache or iis

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