source: extensions/Add_tags_Mass/admin.php

<?php
// +-----------------------------------------------------------------------+
// | Piwigo - a PHP based picture gallery                                  |
// +-----------------------------------------------------------------------+
// | This program is free software; you can redistribute it and/or modify  |
// | it under the terms of the GNU General Public License as published by  |
// | the Free Software Foundation                                          |
// |                                                                       |
// | This program is distributed in the hope that it will be useful, but   |
// | WITHOUT ANY WARRANTY; without even the implied warranty of            |
// | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU      |
// | General Public License for more details.                              |
// |                                                                       |
// | You should have received a copy of the GNU General Public License     |
// | along with this program; if not, write to the Free Software           |
// | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, |
// | USA.                                                                  |
// +-----------------------------------------------------------------------+

if( !defined("PHPWG_ROOT_PATH") )
{
  die ("Hacking attempt!");
}

include_once(PHPWG_ROOT_PATH.'admin/include/functions.php');
include_once(PHPWG_ROOT_PATH.'admin/include/tabsheet.class.php');
load_language('plugin.lang', ADDTM_PATH);

$base_url = get_root_url().'admin.php?page=plugin-Add_tags_mass';

// +-----------------------------------------------------------------------+
// | Check Access and exit when user status is not ok                      |
// +-----------------------------------------------------------------------+

check_status(ACCESS_ADMINISTRATOR);

// +-----------------------------------------------------------------------+
// | Tabs                                                                  |
// +-----------------------------------------------------------------------+

$tabs = array(
  array(
    'code' => 'update',
    'label' => l10n('Update'),
    ),
  );

$tab_codes = array_column($tabs, 'code');

if (isset($_GET['tab']) and in_array($_GET['tab'], $tab_codes))
{
  $page['tab'] = $_GET['tab'];
}
else
{
  $page['tab'] = $tabs[0]['code'];
}

$tabsheet = new tabsheet();
foreach ($tabs as $tab)
{
  $tabsheet->add(
    $tab['code'],
    $tab['label'],
    $base_url.'-'.$tab['code']
    );
}
$tabsheet->select($page['tab']);
$tabsheet->assign();

// +-----------------------------------------------------------------------+
// |                             template init                             |
// +-----------------------------------------------------------------------+

$template->set_filenames(
  array(
    'plugin_admin_content' => dirname(__FILE__).'/admin_'.$page['tab'].'.tpl'
    )
  );

// +-----------------------------------------------------------------------+
// |                             Load the tab                              |
// +-----------------------------------------------------------------------+

include(ADDTM_PATH.'admin_'.$page['tab'].'.php');

// +-----------------------------------------------------------------------+
// | sending html code                                                     |
// +-----------------------------------------------------------------------+

$template->assign_var_from_handle('ADMIN_CONTENT', 'plugin_admin_content');
?>