This keeps popping up after I try to connect to a databse. This is a user registration/login project. Was trying to push my details into the database and that appears every single time.

I have tried all possible methods like chaning the extension=mysqli, un-semicoloning it and what not. It still doesnt work. Please help me. Or just provide me with another alternate way to work with my php and sql project. I am using XAMPP right now. Thanks.