");
    exit;
  }
  // delete user(s)
  if ($_POST['del_user']){
    // search for checkboxes
    $users = array_keys($_POST, "on");
    $userstr = implode(";", $users);
    echo(" ");
  }
  exit;
}
echo $_SESSION['header'];
echo "
listusers \n";
echo " \n";
echo "\n";
echo "\n";
// generate attribute-description table
$attr_array;	// list of LDAP attributes to show
$desc_array;	// list of descriptions for the attributes
$attr_string = $_SESSION["config"]->get_userlistAttributes();
$temp_array = explode(";", $attr_string);
$hash_table = $_SESSION["ldap"]->attributeUserArray();
$page = $_GET["page"];
if (!$page)
     $page = 1;
// take maximum count of user entries shown on one page out of session
if ($_SESSION["config"]->get_MaxListEntries() <= 0)
     $max_pageentrys = 10;	// default setting, if not yet set
     else
     $max_pageentrys = $_SESSION["config"]->get_MaxListEntries();
for ($i = 0; $i < sizeof($temp_array); $i++) {
  // if value is predifined, look up description in hash_table
  if (substr($temp_array[$i],0,1) == "#") {
    $attr = substr($temp_array[$i],1);
    $attr_array[$i] = $attr;
    $desc_array[] = strtoupper($hash_table[$attr]);
  }
  // if not predefined, the attribute is seperated by a ":" from description
  else {
    $attr = explode(":", $temp_array[$i]);
    $attr_array[$i] = $attr[0];
    $desc_array[$i] = strtoupper($attr[1]);
  }
}
$sortattrib = $_GET["sortattrib"];
if (!$sortattrib)
     $sortattrib = strtolower($attr_array[0]);
// check search suffix
if ($_POST['usr_suffix']) $usr_suffix = $_POST['usr_suffix'];  // new suffix selected via combobox
elseif ($_SESSION['usr_suffix']) $usr_suffix = $_SESSION['usr_suffix'];  // old suffix from session
else $usr_suffix = $_SESSION["config"]->get_UserSuffix();  // default suffix
session_register('usr_suffix');
// generate search filter for sort links
$searchfilter = "";
for ($k = 0; $k < sizeof($desc_array); $k++) {
	if ($_POST["filter" . strtolower($attr_array[$k])]) {
		$searchfilter = $searchfilter . "&filter" .
		  strtolower($attr_array[$k]) . "=".
		  $_POST["filter" . strtolower($attr_array[$k])];
	}
}
// configure search filter
// Users have the attribute "*"
	if ($_SESSION['config']->get_samba3() == "yes") {
		// Samba users have the attribute "sambaSamAccount" and end with "$"
		$filter = "(&(objectClass=sambaSamAccount) (!(uid=*$))";
	}
	else {
		// Samba users have the attribute "sambaAccount" and end with "$"
		$filter = "(&(objectClass=sambaAccount) (!(uid=*$))";
	}
for ($k = 0; $k < sizeof($desc_array); $k++) {
  if ($_POST["filter" . strtolower($attr_array[$k])])
    $filter = $filter . "(" . strtolower($attr_array[$k]) . "=" .
      $_POST["filter" . strtolower($attr_array[$k])] . ")";
  else
    $_POST["filter" . strtolower($attr_array[$k])] = "";
}
$filter = $filter . ")";
// read entries only from ldap server if not yet stored in session or if refresh
// button is pressed or if filter is applied
if ($_SESSION["userlist"] && $_GET["norefresh"]) {
  usort ($_SESSION["userlist"], "cmp_array");
  $userinfo = $_SESSION["userlist"];
} else {
  $attrs = $attr_array;
  $sr = @ldap_search($_SESSION["ldap"]->server(),
		     $usr_suffix,
		     $filter, $attrs);
  if ($sr) {
    $userinfo = ldap_get_entries ($_SESSION["ldap"]->server, $sr);
    ldap_free_result ($sr);
    if ($userinfo["count"] == 0) StatusMessage("WARN", "", _("No Users found!"));
    // delete first array entry which is "count"
    array_shift($userinfo);
    usort ($userinfo, "cmp_array");
    $_SESSION["userlist"] = $userinfo;
  }
else
  StatusMessage("ERROR", 
		_("LDAP Search failed! Please check your preferences."),
		_("No Users found!"));
}
$user_count = sizeof ($_SESSION["userlist"]);
echo ("\n");
echo "\n";
/**
 * @brief draws a navigation bar to switch between pages
 * 
 *
 * @return void
 */
function draw_navigation_bar ($user_count) {
  global $max_pageentrys;
  global $page;
  global $sortattrib;
  global $searchfilter;
  echo ("");
}
// compare function used for usort-method
// rows are sorted with the first attribute entry of the sort column
// if objects have attributes with multiple values the others are ignored
function cmp_array($a, $b) {
  // sortattrib specifies the sort column
  global $sortattrib;
  global $attr_array;
  // sort by first attribute with name $sortattrib
	if (!$sortattrib) $sortattrib = strtolower($attr_array[0]);
	if ($a[$sortattrib][0] == $b[$sortattrib][0]) return 0;
	else if ($a[$sortattrib][0] == max($a[$sortattrib][0], $b[$sortattrib][0])) return 1;
	else return -1;
}
?>