SFML will not run scripts (e.g., PHP) for you, manipulate databases (e.g., MySQL) for you, or run servers (e.g., web servers) for you.
However, it allows you to interface with servers through the TCP, UDP, HTTP, and FTP protocols and
it allows you to code your own TCP-derived and/or UDP-derived server (e.g., web server, FTP server, or a custom server).