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I used the following hack to display the complete information on the user currently logged in. This will be displayed instead of the 'Logged in as:' field at the bottom-left of the page.

This proved very useful to me for debugging LDAP/AD group membership problems.

I modified the function tpl_userinfo() in inc/template.php.

The hack

Original:

function tpl_userinfo(){
  global $lang;
  global $INFO;
  if($_SERVER['REMOTE_USER']){
    print $lang['loggedinas'].': '.$INFO['userinfo']['name'];
    return true;
  }
  return false;
}

With extra debugging information:

function tpl_userinfo(){
  global $lang;
  global $INFO;
  if($_SERVER['REMOTE_USER']){
    print 'Debug:<br><font size=2><pre>'.print_r($INFO['userinfo'],true).'</pre></font>';
    return true;
  }
  return false;
}

The nicer way

A nicer way of doing this is checking for a custom option userinfo_debug, which can now be set in conf/local.php:

function tpl_userinfo(){
  global $lang;
  global $INFO;
  global $conf;
  if($_SERVER['REMOTE_USER']){
    if($conf['userinfo_debug'] == 'true') {
      print 'Debug:<br><font size=2><pre>'.print_r($INFO['userinfo'],true).'</pre></font>';
    } else {
      print $lang['loggedinas'].': '.$INFO['userinfo']['name'];
    }
    return true;
  }
  return false;
}

Now to turn on debugging, set the following in conf/local.php:

$conf['userinfo_debug'] = 'true';

To switch off debugging, set the following in conf/local.php:

$conf['userinfo_debug'] = 'false';