I don't know anything about the PHP part, but there are numerous ways to send servo position commands to an arduino web server via a web page. what type of web page interface do you desire?
I don't know what the meaning of "web page interface". I want to control my servo when I click the button on my PHP web. But I don't know how to connect PHP web server to arduino uno to command my servo.
The relevance to Robotics escapes me. Care to explain?
I have a web designed by php webserver. The user who has registered to my web may control the telescope by pushing the button pan and tilt. Then, the user watch the object of the telescope on the web by streaming.