title: set up HTTP authentication
body: <p>I need to set up HTTP authentication. I'm lost, I've researched and found the technique and code to validate $_SERVER['PHP_AUTH_USER'] and $_SERVER['PHP_AUTH_PW'], and I think I understand that. However I don't understand how to set PHP_AUTH_USER and PHP_AUTH_PW ? I used print-r on $_SERVER and didn't see either? Do I somehow set these in a file somewhere on the server, or do I set using code?</p>
  
  <p>I'm on a shared server hosted by Webfaction. </p>
  
  <p>I realize this might not be a great question, but if someone would point me in the right direction it would be great..</p>