Php judges whether the verification code is entered correctly.

1. First, complete the front page of entering the mobile phone number and obtaining the verification code. Enter the mobile phone number, click the get verification code button, and the mobile phone number will receive a short message. When sending the verification code to the mobile phone, the database will save a copy of the verification code and the mobile phone number just sent for verification.

2. Secondly, after obtaining the verification code, you need to click OK to confirm whether the mobile phone that triggered the verification code matches the verification code. After clicking the button, the triggered ajax code first obtains the entered mobile phone number and the entered verification code, and requests the correctness of the verification code from the background. If it is correct, proceed to the next step. If it is not correct, it will prompt "Incorrect verification code input".

3. Finally, the front-end ajax brings the mobile phone number and the verification code in the verification code parameter database for matching query. If the data is not expired, it is the correct verification code, otherwise it is the wrong verification code.