Multiple mysql users for different roles in one db

Question

I was just wondering if it is safer to have different users for different tasks in a db. For example: One user in one php file with the permission to select One user in another php file with permission to select and update

That way, if a hacker somehow got access to the first user through the first php file, he/she would only be able to select.

Is it better to just use one user that can select and update?

Answer 1

It is generally best practice to have the minimum permission set required to perform any database task.

It is also best practice to not store usernames/passwords in the .php file. Instead store them in a configuration file outside of your version control.