Question

I have been working on project, to make a website which read files(c/c++ text file) and compile the code written on it.

How can I use compiler which is on my server?

Answer 1

If $_POST['CODE'] contains the cpp code. You can do the following.

$code = do_sanitizing($_POST['CODE']);
$filename = "cfile".time().".c";
// put the contents in a file
file_put_contents($filename, $code);
// compile it
$output = system("/usr/bin/gcc $filename  2>&1");
echo $output;

Note: This type of compiling and running programs afterwards has dangerous security flaws.

1. You must sanitize user input
2. The C source code may crash the compiling process
3. The output program might contain code that is dangerous to your server.