I am trying to learn the OOP and DI. I am receiving help from FOSUserBundle and coding my own bundle to learn things.
FOS has:
UserManager.php and UserManagerInterface.php.
Now, I want to make UserService.php in the Service folder.
I am confused about whether I can replace UserManager.php with userService.php, or do I need to make a new file?
userService.php extends userManager.php.
I want to keep things modular.