为stdin提供价值以供在线判断

Question

I was making an online judge and ran into bit of a problem

What I've done till now?

So my php code takes user code and gives it to a function Compile() which compiles the code and reports back whether the compilation has been successful or not. This part of the code works pretty well.

Now the things left are running the code and evaluation

My problem

My problem is how to handle stdin inputs for user. User generally takes input from stdin using scanf, BufferedReader etc and these values are generally taken using keyboard. Now supposing that i have written those values in a file. How will i feed them these value.

My Attempts

Well I was searching for various ways and i came across this

fopen('php://stdin', 'w') 

If i believe that this works like a file than wouldn't it cause problem if multiple users use stdin at the sametime.

Answer 1

If you have the compiled code and knows the language of it, it is a little simpler.

You can use the exec function to execute the code, and you can use as a command, something like this (for a c program, and tested):

$output = array();
exec("./main < sample_input.txt", $output);

And if you now inspect the $output var, it has an entry in the array for each line outputted.

Hope this helps.