Control Using Ethernet as Client With Php Server

Hello everyone,

Im New here i hope you'll help with this short question

I connected the arduino ethernet sheild to php server with mysql database
and send analoge data inside the database and save them and its done .

now i want to turn led on or off .. with the same php page and i dont know how

i tried to do it but there is errors i just want simple example

arduino code , and php code

that turns led on and off .. from php server