could you please elaborate how to do that

[shiv]

<<< split from I need to build web site with c++ compiler >>>
could you please make it more clear. how it could be implemented. please help

Upload the file, use PHP's system() to call gcc on the file, and system() again to run the executable.

You can probably do that in 20 minutes if you are experienced with PHP.

I hope this is not a university graduation project?

[Salem]

You could elaborate on the effort you've put into solving the problem yourself.