Php basic series: learn basic mysql extension operations from user logon handler

User registration and login are one of the most basic functional modules of website development. now, you can learn some basic php operations on mysql by logging on to the processing code. There is no difficulty in writing the basic code. as a developer, you should be able to write the basic code to improve your memory, at the same time, I hope to register and log on to beginner users as one of the most basic functional modules of website development. now I want to learn some basic php operations on mysql by logging on to the processing code. There is no difficulty in writing the basic code. as a developer, you should be able to write the basic code on your own to enhance your memory. at the same time, you may wish to provide some reference for beginners. When php connects to the MySQL database server, there are three main APIs available: PHP MySQL extension PHP mysqli extension PHP Data object (PDO) Other knowledge: For the list page, if ($ row = mysql_fetch_assoc ($ res) multiple records are displayed and changed to while ($ row = mysql_fetch_assoc ($ res )).