group_invitation.php 19 KB

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  1. <?php
  2. /* For licensing terms, see /license.txt */
  3. /**
  4. * @package chamilo.social
  5. * @author Julio Montoya <gugli100@gmail.com>
  6. */
  7. /**
  8. * Initialization
  9. */
  10. // name of the language file that needs to be included
  11. $language_file=array('userInfo');
  12. // resetting the course id
  13. $cidReset=true;
  14. // including some necessary dokeos files
  15. require_once '../inc/global.inc.php';
  16. require_once '../inc/lib/xajax/xajax.inc.php';
  17. api_block_anonymous_users();
  18. $xajax = new xajax();
  19. //$xajax->debugOn();
  20. $xajax -> registerFunction ('search_users');
  21. // setting the section (for the tabs)
  22. $this_section = SECTION_PLATFORM_ADMIN;
  23. // setting breadcrumbs
  24. $this_section = SECTION_SOCIAL;
  25. $interbreadcrumb[]= array ('url' =>'home.php','name' => get_lang('Social'));
  26. $interbreadcrumb[]= array ('url' =>'groups.php','name' => get_lang('Groups'));
  27. // Database Table Definitions
  28. $tbl_group = Database::get_main_table(TABLE_MAIN_GROUP);
  29. $tbl_user = Database::get_main_table(TABLE_MAIN_USER);
  30. $tbl_group_rel_user = Database::get_main_table(TABLE_MAIN_USER_REL_GROUP);
  31. // setting the name of the tool
  32. $tool_name = get_lang('SubscribeUsersToGroup');
  33. $group_id = intval($_REQUEST['id']);
  34. $add_type = 'multiple';
  35. if(isset($_REQUEST['add_type']) && $_REQUEST['add_type']!=''){
  36. $add_type = Security::remove_XSS($_REQUEST['add_type']);
  37. }
  38. //checking for extra field with filter on
  39. require_once api_get_path(LIBRARY_PATH).'usermanager.lib.php';
  40. require_once api_get_path(LIBRARY_PATH).'group_portal_manager.lib.php';
  41. require_once api_get_path(LIBRARY_PATH).'social.lib.php';
  42. //todo @this validation could be in a function in group_portal_manager
  43. if (empty($group_id)) {
  44. api_not_allowed();
  45. } else {
  46. $group_info = GroupPortalManager::get_group_data($group_id);
  47. if (empty($group_info)) {
  48. api_not_allowed();
  49. }
  50. //only admin or moderator can do that
  51. if (!GroupPortalManager::is_group_member($group_id)) {
  52. api_not_allowed();
  53. }
  54. }
  55. function search_users($needle,$type) {
  56. global $tbl_user,$tbl_group_rel_user,$group_id;
  57. $xajax_response = new XajaxResponse();
  58. $return = '';
  59. if (!empty($needle) && !empty($type)) {
  60. // xajax send utf8 datas... datas in db can be non-utf8 datas
  61. $charset = api_get_system_encoding();
  62. $needle = Database::escape_string($needle);
  63. $needle = api_convert_encoding($needle, $charset, 'utf-8');
  64. $user_anonymous=api_get_anonymous_id();
  65. $order_clause = api_sort_by_first_name() ? ' ORDER BY firstname, lastname, username' : ' ORDER BY lastname, firstname, username';
  66. $cond_user_id = '';
  67. if (!empty($id_session)) {
  68. $group_id = Database::escape_string($group_id);
  69. // check id_user from session_rel_user table
  70. $sql = 'SELECT id_user FROM '.$tbl_group_rel_user.' WHERE group_id ="'.(int)$group_id.'"';
  71. $res = Database::query($sql);
  72. $user_ids = array();
  73. if (Database::num_rows($res) > 0) {
  74. while ($row = Database::fetch_row($res)) {
  75. $user_ids[] = (int)$row[0];
  76. }
  77. }
  78. if (count($user_ids) > 0){
  79. $cond_user_id = ' AND user_id NOT IN('.implode(",",$user_ids).')';
  80. }
  81. }
  82. if ($type == 'single') {
  83. // search users where username or firstname or lastname begins likes $needle
  84. $sql = 'SELECT user_id, username, lastname, firstname FROM '.$tbl_user.' user
  85. WHERE (username LIKE "'.$needle.'%"
  86. OR firstname LIKE "'.$needle.'%"
  87. OR lastname LIKE "'.$needle.'%") AND user_id<>"'.$user_anonymous.'"'.
  88. $order_clause.
  89. ' LIMIT 11';
  90. } else {
  91. $sql = 'SELECT user_id, username, lastname, firstname FROM '.$tbl_user.' user
  92. WHERE '.(api_sort_by_first_name() ? 'firstname' : 'lastname').' LIKE "'.$needle.'%" AND user_id<>"'.$user_anonymous.'"'.$cond_user_id.
  93. $order_clause;
  94. }
  95. global $_configuration;
  96. if ($_configuration['multiple_access_urls']) {
  97. $tbl_user_rel_access_url= Database::get_main_table(TABLE_MAIN_ACCESS_URL_REL_USER);
  98. $access_url_id = api_get_current_access_url_id();
  99. if ($access_url_id != -1){
  100. if ($type == 'single') {
  101. $sql = 'SELECT user.user_id, username, lastname, firstname FROM '.$tbl_user.' user
  102. INNER JOIN '.$tbl_user_rel_access_url.' url_user ON (url_user.user_id=user.user_id)
  103. WHERE access_url_id = '.$access_url_id.' AND (username LIKE "'.$needle.'%"
  104. OR firstname LIKE "'.$needle.'%"
  105. OR lastname LIKE "'.$needle.'%") AND user.user_id<>"'.$user_anonymous.'"'.
  106. $order_clause.
  107. ' LIMIT 11';
  108. } else {
  109. $sql = 'SELECT user.user_id, username, lastname, firstname FROM '.$tbl_user.' user
  110. INNER JOIN '.$tbl_user_rel_access_url.' url_user ON (url_user.user_id=user.user_id)
  111. WHERE access_url_id = '.$access_url_id.'
  112. AND '.(api_sort_by_first_name() ? 'firstname' : 'lastname').' LIKE "'.$needle.'%" AND user.user_id<>"'.$user_anonymous.'"'.$cond_user_id.
  113. $order_clause;
  114. }
  115. }
  116. }
  117. $rs = Database::query($sql);
  118. $i=0;
  119. if ($type=='single') {
  120. while ($user = Database :: fetch_array($rs)) {
  121. $i++;
  122. if ($i<=10) {
  123. $person_name = api_get_person_name($user['firstname'], $user['lastname']);
  124. $return .= '<a href="javascript: void(0);" onclick="javascript: add_user(\''.$user['user_id'].'\',\''.$person_name.' ('.$user['username'].')'.'\')">'.$person_name.' ('.$user['username'].')</a><br />';
  125. } else {
  126. $return .= '...<br />';
  127. }
  128. }
  129. $xajax_response -> addAssign('ajax_list_users_single','innerHTML',api_utf8_encode($return));
  130. } else {
  131. global $nosessionUsersList;
  132. $return .= '<select id="origin_users" name="nosessionUsersList[]" multiple="multiple" size="15" style="width:360px;">';
  133. while ($user = Database :: fetch_array($rs)) {
  134. $person_name = api_get_person_name($user['firstname'], $user['lastname']);
  135. $return .= '<option value="'.$user['user_id'].'">'.$person_name.' ('.$user['username'].')</option>';
  136. }
  137. $return .= '</select>';
  138. $xajax_response -> addAssign('ajax_list_users_multiple','innerHTML',api_utf8_encode($return));
  139. }
  140. }
  141. return $xajax_response;
  142. }
  143. $xajax -> processRequests();
  144. $htmlHeadXtra[] = $xajax->getJavascript('../inc/lib/xajax/');
  145. $htmlHeadXtra[] = '
  146. <script type="text/javascript">
  147. function add_user (code, content) {
  148. // document.getElementById("user_to_add").value = "";
  149. //document.getElementById("ajax_list_users_single").innerHTML = "";
  150. destination = document.getElementById("destination_users");
  151. for (i=0;i<destination.length;i++) {
  152. if(destination.options[i].text == content) {
  153. return false;
  154. }
  155. }
  156. destination.options[destination.length] = new Option(content,code);
  157. destination.selectedIndex = -1;
  158. sortOptions(destination.options);
  159. }
  160. function remove_item(origin) {
  161. for(var i = 0 ; i<origin.options.length ; i++) {
  162. if(origin.options[i].selected) {
  163. origin.options[i]=null;
  164. i = i-1;
  165. }
  166. }
  167. }
  168. function validate_filter() {
  169. document.formulaire.add_type.value = \''.$add_type.'\';
  170. document.formulaire.form_sent.value=0;
  171. document.formulaire.submit();
  172. }
  173. </script>';
  174. $form_sent=0;
  175. $errorMsg=$firstLetterUser=$firstLetterSession='';
  176. $UserList=$SessionList=array();
  177. $users=$sessions=array();
  178. Display :: display_header($tool_name, 'Groups');
  179. if($_POST['form_sent']) {
  180. $form_sent = $_POST['form_sent'];
  181. $firstLetterUser = $_POST['firstLetterUser'];
  182. $firstLetterSession = $_POST['firstLetterSession'];
  183. $user_list = $_POST['sessionUsersList'];
  184. $group_id = intval($_POST['id']);
  185. if(!is_array($user_list)) {
  186. $user_list=array();
  187. }
  188. if ($form_sent == 1) {
  189. //invite this users
  190. $result = GroupPortalManager::add_users_to_groups($user_list, array($group_id), GROUP_USER_PERMISSION_PENDING_INVITATION);
  191. $title = get_lang('YouAreInvitedToGroup').' '.$group_info['name'];
  192. $content = get_lang('YouAreInvitedToGroupContent').' '.$group_info['name'].' <br />';
  193. $content .= get_lang('ToSubscribeClickInTheLinkBelow').' <br />';
  194. $content .= '<a href="'.api_get_path(WEB_CODE_PATH).'social/invitations.php?accept='.$group_id.'">'.get_lang('Subscribe').'</a>';
  195. if (is_array($user_list) && count($user_list) > 0) {
  196. //send invitation message
  197. foreach($user_list as $user_id ){
  198. $result = MessageManager::send_message($user_id, $title, $content);
  199. }
  200. }
  201. }
  202. }
  203. $nosessionUsersList = $sessionUsersList = array();
  204. $ajax_search = $add_type == 'unique' ? true : false;
  205. global $_configuration;
  206. $order_clause = api_sort_by_first_name() ? ' ORDER BY firstname, lastname, username' : ' ORDER BY lastname, firstname, username';
  207. if ($ajax_search) {
  208. $sql="SELECT u.user_id, lastname, firstname, username, group_id
  209. FROM $tbl_user u
  210. LEFT JOIN $tbl_group_rel_user gu
  211. ON (gu.user_id = u.user_id) WHERE gu.group_id = $group_id ".
  212. $order_clause;
  213. if ($_configuration['multiple_access_urls']) {
  214. $tbl_user_rel_access_url= Database::get_main_table(TABLE_MAIN_ACCESS_URL_REL_USER);
  215. $access_url_id = api_get_current_access_url_id();
  216. if ($access_url_id != -1){
  217. $sql="SELECT u.user_id, lastname, firstname, username, id_session
  218. FROM $tbl_user u
  219. INNER JOIN $tbl_session_rel_user
  220. ON $tbl_session_rel_user.id_user = u.user_id
  221. AND $tbl_session_rel_user.id_session = ".intval($id_session)."
  222. INNER JOIN $tbl_user_rel_access_url url_user ON (url_user.user_id=u.user_id)
  223. WHERE access_url_id = $access_url_id
  224. $order_clause";
  225. }
  226. }
  227. $result=Database::query($sql);
  228. $Users=Database::store_result($result);
  229. foreach ($Users as $user) {
  230. $sessionUsersList[$user['user_id']] = $user ;
  231. }
  232. } else {
  233. $friends = SocialManager::get_friends(api_get_user_id());
  234. $suggest_friends = false;
  235. if (!$friends) {
  236. $suggest_friends = true;
  237. } else {
  238. foreach($friends as $friend) {
  239. $group_friend_list = GroupPortalManager::get_groups_by_user($friend['friend_user_id'], 0);
  240. //var_dump($group_friend_list);
  241. $friend_group_id = '';
  242. if (isset($group_friend_list[$group_id]) && $group_friend_list[$group_id]['id'] == $group_id) {
  243. $friend_group_id = $group_id;
  244. }
  245. //var_dump ($group_friend_list[$group_id]['relation_type']);
  246. if ($group_friend_list[$group_id]['relation_type'] == '' ) {
  247. $Users[$friend['friend_user_id']]=array('user_id' => $friend['friend_user_id'], 'firstname' =>$friend['firstName'], 'lastname' => $friend['lastName'], 'username' =>$friend['username'],'group_id'=>$friend_group_id );
  248. }
  249. }
  250. }
  251. if (is_array($Users) && count($Users) > 0 ) {
  252. foreach ($Users as $user) {
  253. if($user['group_id'] != $group_id)
  254. $nosessionUsersList[$user['user_id']] = $user ;
  255. }
  256. }
  257. //deleting anonymous users
  258. $user_anonymous = api_get_anonymous_id();
  259. foreach($nosessionUsersList as $key_user_list =>$value_user_list) {
  260. if ($nosessionUsersList[$key_user_list]['user_id']==$user_anonymous) {
  261. unset($nosessionUsersList[$key_user_list]);
  262. }
  263. }
  264. }
  265. if ($add_type == 'multiple') {
  266. $link_add_type_unique = '<a href="'.api_get_self().'?id='.$group_id.'&add='.Security::remove_XSS($_GET['add']).'&add_type=unique">'.Display::return_icon('single.gif').get_lang('SessionAddTypeUnique').'</a>';
  267. $link_add_type_multiple = Display::return_icon('multiple.gif').get_lang('SessionAddTypeMultiple');
  268. } else {
  269. $link_add_type_unique = Display::return_icon('single.gif').get_lang('SessionAddTypeUnique');
  270. $link_add_type_multiple = '<a href="'.api_get_self().'?id='.$group_id.'&add='.Security::remove_XSS($_GET['add']).'&add_type=multiple">'.Display::return_icon('multiple.gif').get_lang('SessionAddTypeMultiple').'</a>';
  271. }
  272. /* <?php $link_add_type_unique ?>&nbsp;|&nbsp;<?php $link_add_type_multiple ?> */
  273. //Shows left column
  274. //echo GroupPortalManager::show_group_column_information($group_id, api_get_user_id());
  275. echo '<div id="social-content">';
  276. echo '<div id="social-content-left">';
  277. //this include the social menu div
  278. SocialManager::show_social_menu('invite_friends',$group_id);
  279. echo '</div>';
  280. echo '<div id="social-content-right">';
  281. echo '<h1><a href="groups.php?id='.$group_id.'">'.$group_info['name'].'</a></h1>';
  282. if (count($nosessionUsersList) == 0) {
  283. $friends = SocialManager::get_friends(api_get_user_id());
  284. if ($friends == 0) {
  285. echo get_lang('YouNeedToHaveFriendsInYourSocialNetwork');
  286. } else {
  287. echo get_lang('YouAlreadyInviteAllYourContacts');
  288. }
  289. echo '<div>';
  290. echo '<a href="search.php">'.get_lang('TryAndFindSomeFriends').'</a>';
  291. echo '</div>';
  292. echo '</div>'; // end layout right
  293. echo '</div>'; //
  294. Display::display_footer();
  295. exit;
  296. }
  297. ?>
  298. <form name="formulaire" method="post" action="<?php echo api_get_self(); ?>?id=<?php echo $group_id; ?><?php if(!empty($_GET['add'])) echo '&add=true' ; ?>" style="margin:0px;" <?php if($ajax_search){echo ' onsubmit="valide();"';}?>>
  299. <?php
  300. if ($add_type=='multiple') {
  301. if (is_array($extra_field_list)) {
  302. if (is_array($new_field_list) && count($new_field_list)>0 ) {
  303. echo '<h3>'.get_lang('FilterUsers').'</h3>';
  304. foreach ($new_field_list as $new_field) {
  305. echo $new_field['name'];
  306. $varname = 'field_'.$new_field['variable'];
  307. echo '&nbsp;<select name="'.$varname.'">';
  308. echo '<option value="0">--'.get_lang('Select').'--</option>';
  309. foreach ($new_field['data'] as $option) {
  310. $checked='';
  311. if (isset($_POST[$varname])) {
  312. if ($_POST[$varname]==$option[1]) {
  313. $checked = 'selected="true"';
  314. }
  315. }
  316. echo '<option value="'.$option[1].'" '.$checked.'>'.$option[1].'</option>';
  317. }
  318. echo '</select>';
  319. echo '&nbsp;&nbsp;';
  320. }
  321. echo '<input type="button" value="'.get_lang('Filter').'" onclick="validate_filter()" />';
  322. echo '<br /><br />';
  323. }
  324. }
  325. }
  326. ?>
  327. <input type="hidden" name="form_sent" value="1" />
  328. <input type="hidden" name="id" value="<?php echo $group_id?>" />
  329. <input type="hidden" name="add_type" />
  330. <?php
  331. if(!empty($errorMsg)) {
  332. Display::display_error_message($errorMsg); //main API
  333. }
  334. ?>
  335. <table border="0" cellpadding="5" cellspacing="0" width="100%">
  336. <!-- Users -->
  337. <tr>
  338. <td align="center"><b><?php echo get_lang('Friends') ?> :</b>
  339. </td>
  340. <td></td>
  341. <td align="center"><b><?php echo get_lang('SendInvitationTo') ?> :</b></td>
  342. </tr>
  343. <?php if ($add_type=='no') { ?>
  344. <tr>
  345. <td align="center">
  346. <?php echo get_lang('FirstLetterUser'); ?> :
  347. <select name="firstLetterUser" onchange = "xajax_search_users(this.value,'multiple')" >
  348. <option value = "%">--</option>
  349. <?php
  350. echo Display :: get_alphabet_options();
  351. ?>
  352. </select>
  353. </td>
  354. <td align="center">&nbsp;</td>
  355. </tr>
  356. <?php } ?>
  357. <tr>
  358. <td align="center">
  359. <div id="content_source">
  360. <?php
  361. if (!($add_type=='multiple')) {
  362. ?>
  363. <input type="text" id="user_to_add" onkeyup="xajax_search_users(this.value,'single')" />
  364. <div id="ajax_list_users_single"></div>
  365. <?php
  366. } else {
  367. ?>
  368. <div id="ajax_list_users_multiple">
  369. <select id="origin_users" name="nosessionUsersList[]" multiple="multiple" size="15" style="width:290px;">
  370. <?php
  371. foreach($nosessionUsersList as $enreg) {
  372. ?>
  373. <option value="<?php echo $enreg['user_id']; ?>" <?php if(in_array($enreg['user_id'],$UserList)) echo 'selected="selected"'; ?>><?php echo api_get_person_name($enreg['firstname'], $enreg['lastname']).' ('.$enreg['username'].')'; ?></option>
  374. <?php
  375. }
  376. ?>
  377. </select>
  378. </div>
  379. <?php
  380. }
  381. unset($nosessionUsersList);
  382. ?>
  383. </div>
  384. </td>
  385. <td width="10%" valign="middle" align="center">
  386. <?php
  387. if ($ajax_search) {
  388. ?>
  389. <button class="arrowl" type="button" onclick="remove_item(document.getElementById('destination_users'))" ></button>
  390. <?php
  391. } else {
  392. ?>
  393. <button class="arrowr" type="button" onclick="moveItem(document.getElementById('origin_users'), document.getElementById('destination_users'))" ></button>
  394. <br /><br />
  395. <button class="arrowl" type="button" onclick="moveItem(document.getElementById('destination_users'), document.getElementById('origin_users'))" ></button>
  396. <br /><br />
  397. <?php
  398. }
  399. ?>
  400. <br /><br /><br /><br /><br />
  401. </td>
  402. <td align="center">
  403. <select id="destination_users" name="sessionUsersList[]" multiple="multiple" size="15" style="width:290px;">
  404. <?php
  405. foreach($sessionUsersList as $enreg) {
  406. ?>
  407. <option value="<?php echo $enreg['user_id']; ?>"><?php echo api_get_person_name($enreg['firstname'], $enreg['lastname']).' ('.$enreg['username'].')'; ?></option>
  408. <?php
  409. }
  410. unset($sessionUsersList);
  411. ?>
  412. </select></td>
  413. </tr>
  414. <tr>
  415. <td colspan="3" align="center">
  416. <br />
  417. <?php
  418. echo '<button class="save" type="button" value="" onclick="valide()" >'.get_lang('InviteUsersToGroup').'</button>';
  419. ?>
  420. </td>
  421. </tr>
  422. </table>
  423. </form>
  424. <?php
  425. //current group members
  426. $members = GroupPortalManager::get_users_by_group($group_id, false, array(GROUP_USER_PERMISSION_PENDING_INVITATION));
  427. if (is_array($members) && count($members)>0) {
  428. foreach ($members as &$member) {
  429. $image_path = UserManager::get_user_picture_path_by_id($member['user_id'], 'web', false, true);
  430. $picture = UserManager::get_picture_user($member['user_id'], $image_path['file'],80);
  431. $member['image'] = '<img src="'.$picture['file'].'" width="50px" height="50px" />';
  432. }
  433. echo '<span class="social-groups-text1"><strong>'.get_lang('UsersAlreadyInvited').'</strong></span>';
  434. Display::display_sortable_grid('invitation_profile', array(), $members, array('hide_navigation'=>true, 'per_page' => 100), $query_vars, false, array(true, false, true,true));
  435. }
  436. echo '</div>'; // end layout right
  437. echo '</div>';
  438. ?>
  439. <script type="text/javascript">
  440. <!--
  441. function moveItem(origin , destination) {
  442. for(var i = 0 ; i<origin.options.length ; i++) {
  443. if(origin.options[i].selected) {
  444. destination.options[destination.length] = new Option(origin.options[i].text,origin.options[i].value);
  445. origin.options[i]=null;
  446. i = i-1;
  447. }
  448. }
  449. destination.selectedIndex = -1;
  450. sortOptions(destination.options);
  451. }
  452. function sortOptions(options) {
  453. newOptions = new Array();
  454. for (i = 0 ; i<options.length ; i++)
  455. newOptions[i] = options[i];
  456. newOptions = newOptions.sort(mysort);
  457. options.length = 0;
  458. for(i = 0 ; i < newOptions.length ; i++)
  459. options[i] = newOptions[i];
  460. }
  461. function mysort(a, b){
  462. if(a.text.toLowerCase() > b.text.toLowerCase()){
  463. return 1;
  464. }
  465. if(a.text.toLowerCase() < b.text.toLowerCase()){
  466. return -1;
  467. }
  468. return 0;
  469. }
  470. function valide(){
  471. var options = document.getElementById('destination_users').options;
  472. for (i = 0 ; i<options.length ; i++)
  473. options[i].selected = true;
  474. document.forms.formulaire.submit();
  475. }
  476. function loadUsersInSelect(select){
  477. var xhr_object = null;
  478. if(window.XMLHttpRequest) // Firefox
  479. xhr_object = new XMLHttpRequest();
  480. else if(window.ActiveXObject) // Internet Explorer
  481. xhr_object = new ActiveXObject("Microsoft.XMLHTTP");
  482. else // XMLHttpRequest non supporté par le navigateur
  483. alert("Votre navigateur ne supporte pas les objets XMLHTTPRequest...");
  484. //xhr_object.open("GET", "loadUsersInSelect.ajax.php?id_session=<?php echo $id_session ?>&letter="+select.options[select.selectedIndex].text, false);
  485. xhr_object.open("POST", "loadUsersInSelect.ajax.php");
  486. xhr_object.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
  487. nosessionUsers = makepost(document.getElementById('origin_users'));
  488. sessionUsers = makepost(document.getElementById('destination_users'));
  489. nosessionClasses = makepost(document.getElementById('origin_classes'));
  490. sessionClasses = makepost(document.getElementById('destination_classes'));
  491. xhr_object.send("nosessionusers="+nosessionUsers+"&sessionusers="+sessionUsers+"&nosessionclasses="+nosessionClasses+"&sessionclasses="+sessionClasses);
  492. xhr_object.onreadystatechange = function() {
  493. if(xhr_object.readyState == 4) {
  494. document.getElementById('content_source').innerHTML = result = xhr_object.responseText;
  495. //alert(xhr_object.responseText);
  496. }
  497. }
  498. }
  499. function makepost(select) {
  500. var options = select.options;
  501. var ret = "";
  502. for (i = 0 ; i<options.length ; i++)
  503. ret = ret + options[i].value +'::'+options[i].text+";;";
  504. return ret;
  505. }
  506. -->
  507. </script>
  508. <?php
  509. /* FOOTER */
  510. Display::display_footer();