Wordpress Auto Install PHP script

Develope a php script to install a wordpress instance. Requirements: Functional requirements: 1. Add user to linux.( by parameter) 2. Add user to a pre-configured group(by parameter) 3. Create a mysql database and user 4. Add user, password, database, domain and group to a table in another mysql db 5. Install wordpress in /home/<username> 6. Create [login to view URL] file with user and database configured 7. Create a pre-configured file to ningix dir (/etc/nginx/sites-available) (by domain parameter) 8. Reload Nginx (/etc/init.d/nginx reload) Non functional requirements: 1. Each functionality must be made as a function 2. The code must be clear and commented