Because there are many courses at ordinary times, we have to learn PHP by ourselves in our spare time, so the progress is also very slow. It's almost a month since I learned PHP. I wrote this simple PHP login and registration according to my own ideas without referring to any code. I'm still a little pleased. However, I also know that this is not a perfect program, and there are many BUGs, which are not well considered. But I believe that with in-depth study, I will continue to make progress. Cheng