Still I'm having problem in grantting permission to users (other than root) to be able to develop PHP pages on /var/www/html; What I have done so far and was expecting to work is modifiing /etc/sudoers as following:
## Allow root to run any commands anywhere
root ALL=(ALL) ALL
Developer1 ALL=(ALL) ALL
The reason I need to do this is because only root can modify the file on web server. I'm not sure the above procedure is safe or proper but will appreciate it if somebody could give me a solution.