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<?php

answer(); 
say ("Welcome.");

$question_cnt = 1;
 
function ask_question($q)
{
  switch ($q) {
    case 1:
      $event = ask('Do you like the number one?', array("choices" => "no(no),yes(yes),back(back)","onEvent" => create_function( '$event', "return $event->value;")));
      break;
    case 2:
      $event = ask('Do you like the number two?', array("choices" => "no(no),yes(yes),back(back)","onEvent" => create_function( '$event', "return $event->value;")));
      break;
    case 3:
      $event = ask('Do you like the number three?', array("choices" => "no(no),yes(yes),back(back)","onEvent" => create_function( '$event', "return $event->value;")));
      break;
  }
  return $event;
}

do {
  $event = ask_question($question_cnt);
  say("You said: ".$event->value);
  if ($event->value == 'back') {
    $question_cnt -= 1
  } else {
    $question_cnt += 1
  }
	
} while ($question_cnt < 4); 
 

say ("Thank you. Goodbye.");
hangup();

?>