<?php

   session_start();

   $q = array(
      "What colour is blue?",
      "What colour is red?"
   );

   $a = array(
     "Blue",
     "Red"
   );

   $random = rand(0, count($q) - 1);
   $_SESSION["question"] = $q[$random];
   $_SESSION["answer"] = $a[$random];

   echo $_SESSION["question"];


?>