title: Add additional check in phpbb login process
body: <p>I've been looking everywhere for this and I can't find. phpbb (3, stock, no mods or anything) checks username and password and if it's correct signs the user in. I need to add an additional check, to check 1 more condition before allowing user to login.</p>
  
  <p>How would I go on about doing this?</p>
  
  <p>Thanks!</p>
  
  <p>PS I know it's a generic question I'd post the code for login here if I could find it >.&lt;</p>