how to send data to arduino yun through web?

I am currently doing a project that needs to control UAV through website. The basic idea is to design a website and send control data through wifi, or 3G to arduino yun. Henceforth, arduino yun will generate PWM signal to control the UAV.
It is not a static web. My idea is to send data from browser to a web server and store it in database. Arduino yun can get the data from the data base.
anyone know a easy way to transfer data from web site to arduino yun?

It looks like a quite easy dynamic web application: you can code it using python or php, just to mention two. Google for some php/python tutorial
When you'll be done with the database part and you'll need to talk to the sketch, you will use bridgeclient.php or bridgeclient.py.

Thank you for your response. Is there a way to send data from website to yun directly without using database? There might be a huge delay if using database. I only need to send 4 data to yun. can yun be the server and my browser be the client?

Yes, you can do as you said.
Here are two example to use the Yun as a webserver

http://scuola.arduino.cc/courses/lessons/cover/b4EoRkV

http://scuola.arduino.cc/courses/lessons/cover/E39V1rx

In bridge.ino what's difference between

client.print(F("Pin D"));

and

client.print("Pin D");

Thank's

Using F("MyString") the string will be stored in the flash memory in order to save RAM memory.