PHP Exec command - How to pass input to a series of questions

Question

I have a program on my linux server that asks the same series of questions each time it executes and then provides several lines of output. My goal is to automate the input

Answer 1

Just add the arguments to the exec line.

exec("/path/to/programname $arg1 $arg2 $arg3");

... but don't forget to apply escapeshellarg() on every argument! Otherwise, you're vulnerable to injected malicious code.