Summary of relevant precautions for verification

During this period, we have modified the login function of our system. In order to be more secure, we have added a verification function for sending emails. When the user logs in, it is judged whether the login IP has been logged in before. If not, a verification code needs to be sent to the mailbox, and then the received verification code is entered before logging in. If the verification code is correct and the time does not exceed the specified time, you can Log in, and note the IP and time of this login. If you log in with this IP in the future, you will not need to verify it. If the time exceeds, the verification code becomes invalid and needs to be sent again. If there is a verification error and you cannot log in, you need to re-enter the verification code or send a new verification code to your email. In order to implement this function, I used the knowledge of how to send emails to the mailbox and obtain the login IP. Let’s sort it out so that you can check it out later. Sending emails: First, you need to download the compressed package of phpmail, then decompress it, and copy the decompressed file to the project. Import files into the project. Copy the code as follows: require("phpmailer/class.phpmailer.php"); //The path of the file depends on the path in your project

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## Introduction: During this period, we have modified the login function of our system. More secure, added verification function for sending emails. When the user logs in, it is judged whether the login IP has been logged in before. If not, a verification code needs to be sent to the mailbox, and then the received verification code is entered before logging in. If the verification code is correct and the time does not exceed the specified time, you can Log in, and note the IP and time of this login. If you log in with this IP in the future, you will not need to verify it. If the time exceeds, the verification code becomes invalid and needs to be sent again. If there is a verification error, you cannot log in. You need to re-enter the verification code, or send a new verification code...

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