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

$out = array();
//add elements/parameters/input to array
string $execpath = "my/path/program ";
foreach($out as $parameter) {
  $execpath += $parameter;
  //$execpath += "-"+$execpath; use this if you need to add a '-' in front of your parameters.
}
exec($execpath);