title: PHP session side-effect warning with global variables as a source of data
body: <p>I'm trying to host a PHP web site that was given to me.  I see this warning:</p>
  
  <blockquote>
    <p><strong>Warning:</strong> Unknown: Your script possibly
    relies on a session side-effect which
    existed until PHP 4.2.3. Please be
    advised that the session extension
    does not consider global variables as
    a source of data, unless
    register_globals is enabled. You can
    disable this functionality and this
    warning by setting
    session.bug_compat_42 or
    session.bug_compat_warn to off,
    respectively. in <strong>Unknown</strong> on line <strong>0</strong></p>
  </blockquote>
  
  <p>What does this mean?  How might I track down the source of this problem within the code?</p>