Problem in my user management system php

Question

I have to create a user management system in php. I have done the basic works. The problem is that I have written the code in a .html file and there is another .php file through which i want to perform various Operations..now while registering a member i have to chk whether the user id already exists or not.. where should i chk it? plzz somebody explain, i am unable to understand ☹️

Answer 1

Check if user id exist using mysql (and PHP):
https://stackoverflow.com/questions/31212157/check-if-user-id-exists-in-mysql