How to run a C codes in remote ip using PHP TCP/IP socket connection?

Using socket you can't run any c application directly .You need to call that executable to run .

My idea is you can run another client application on remote and send some data to socket and in remote the client will receive the message based on which it can run he application.

Method 1:
You can receive the file sent from client and save it to disk.
Then, you may use system to compile the file received.
The last step, you run it, use the system again.

But i am not suggest you do that, as it may be dangerous, you never know what the code does. It may deletes all your files in the disk. What's more, the libs the code depend on may not be installed.

Method2:
use the loadable library:
1. all the code sent to server is implement a generic interface
2. pre-compile the code to loadable library
2. server save the code to disk
3. server load the library and call the generic interface
More about loadable library, please check it out.