diff --git a/controllers/anonymous.php b/controllers/anonymous.php
index 27812c9..e72bb89 100644
--- a/controllers/anonymous.php
+++ b/controllers/anonymous.php
@@ -1,154 +1,150 @@
 <?php
 
 /**
  * Content for anonymous users
  *
  * Zed. The immensity of stars. The HyperShip. The people.
  *
  * (c) 2010, Dereckson, some rights reserved.
  * Released under BSD license.
  *
  * This controller handles the pages for not logged in users.
  *
  * It recognizes the following URLs:
  *      /tour       a redirect to tour.html file, a visite guidée from Zed ;
  *      /invite     the page to claim the invites.
  *
  * In all other cases, it prints the login form.
  *
  * @package     Zed
  * @subpackage  Controllers
  * @author      Sébastien Santoro aka Dereckson <dereckson@espace-win.org>
  * @copyright   2010 Sébastien Santoro aka Dereckson
  * @license     http://www.opensource.org/licenses/bsd-license.php BSD
  * @version     0.1
  * @link        http://scherzo.dereckson.be/doc/zed
  * @link        http://zed.dereckson.be/
  * @filesource
  */
 
 //
 // Prepares the page
 //
 
 switch ($url[0]) {
     case 'tour':
         //The user have forgotten .html, let's redirect him
         header('Location: ' . $Config['StaticContentURL'] . '/tour.html');
         exit;
 
     case 'invite':
         //Invite form
         if ($_POST['form'] == 'account.create') {
             //User tries to claim its invite to create an account
             require_once('includes/objects/invite.php');
             require_once('includes/objects/user.php');
 
             //Gets invite
             $invite = new Invite($_POST['invite_code']);
             if ($invite->lastError != '') {
                 //Not existing invite.
                 $smarty->assign('NOTIFY', lang_get("IncorrectInviteCode"));
             } elseif ($invite->is_claimed()) {
                 //The invitation have already claimed by someone else.
                 $smarty->assign('NOTIFY', lang_get("InviteCodeAlreadyClaimed"));
             } else {
                 //Checks if the given information is correct
                 //We ignore bad mails. All we really need is a login and a pass.
                 //We fill our array $errors with all the errors
                 $errors = [];
                 if (!$_POST['username']) {
                     $errors[] = lang_get('MissingUsername');
                 } elseif (!User::is_available_login($_POST['username'])) {
                     $errors[] =  lang_get('LoginUnavailable');
                 }
 
                 if (User::get_username_from_email($_POST['email']) !== false) {
                     $errors[] = "There is already an account with this e-mail.";
                 }
 
                 if (!$_POST['passwd']) {
                     $errors[] = lang_get('MissingPassword');
                 }
 
                 if (count($errors)) {
                     $smarty->assign('WAP', join('<br />', $errors));
                 } else {
                     //Creates account
                     $user = new User();
                     $user->regdate = time();
                     $user->generate_id();
                     $user->name = $_POST['username'];
                     $user->active = 1;
                     $user->email = $_POST['email'];
                     $user->set_password($_POST['passwd']);
                     $user->save_to_database();
 
                     //Updates invite
                     $invite->to_user_id = $user->id;
                     $invite->save_to_database();
 
                     //Notifies host
                     require_once('includes/objects/message.php');
                     $message = new Message();
                     $message->from = 0;
                     $message->to = $invite->from_perso_id;
                     $message->text =  sprintf(lang_get('InviteHaveBeenClaimed'), $invite->code);
                     $message->send();
 
                     //Logs in user
                     login($user->id, $user->name);
 
                     //Prints confirm message
                     $smarty->assign('WAP', lang_get("AccountCreated"));
 
                     //Redirects users to homepage
                     header('refresh: 5; url=' . get_url());
 
                     //Calls void controller
                     $smarty->assign('screen', 'user.create');
                     define('NO_FOOTER_EXTRA', true);
                     include("void.php");
 
                     exit;
                 }
             }
 
             //Keeps username, email, invite code printed on account create form
             $smarty->assign('username', $_POST['username']);
             $smarty->assign('invite_code', $_POST['invite_code']);
             $smarty->assign('email', $_POST['email']);
         }
 
         //If the invite code is specified, checks format
         if ($url[1]) {
             if (preg_match("/^([A-Z]){3}([0-9]){3}$/i", $url[1])) {
                 $smarty->assign('invite_code', strtoupper($url[1]));
             } else {
                 $smarty->assign('NOTIFY', lang_get("IncorrectInviteCode"));
             }
         }
 
         $template = 'account_create.tpl';
         break;
 
     default:
         //Login form
-        if (array_key_exists('LastUsername', $_COOKIE)) {
-            $smarty->assign('username', $_COOKIE['LastUsername']);
-        }
-        if (array_key_exists('LastOpenID', $_COOKIE)) {
-            $smarty->assign('OpenID', $_COOKIE['LastOpenID']);
-        }
-        $smarty->assign('LoginError', $loginError);
+        $smarty->assign('username', $_COOKIE['LastUsername'] ?? "");
+        $smarty->assign('OpenID', $_COOKIE['LastOpenID'] ?? "");
+        $smarty->assign('LoginError', $loginError ?? "");
         $template = 'login.tpl';
         break;
 }
 
 //
 // HTML output
 //
 
 if ($template) {
     $smarty->display($template);
 }
diff --git a/includes/login.php b/includes/login.php
index a541b11..e811a21 100644
--- a/includes/login.php
+++ b/includes/login.php
@@ -1,158 +1,158 @@
 <?php
 
 /**
  * Login/logout
  *
  * Zed. The immensity of stars. The HyperShip. The people.
  *
  * (c) 2010, Dereckson, some rights reserved.
  * Released under BSD license.
  *
  * @package     Zed
  * @subpackage  Keruald
  * @author      Sébastien Santoro aka Dereckson <dereckson@espace-win.org>
  * @copyright   2010 Sébastien Santoro aka Dereckson
  * @license     http://www.opensource.org/licenses/bsd-license.php BSD
  * @version     0.1
  * @link        http://scherzo.dereckson.be/doc/zed
  * @link        http://zed.dereckson.be/
  * @filesource
  *
  * @todo Pick between DumbStore and FileStore and cleans the file accordingly.
  */
 
 ///
 /// OpenID helper code
 ///
 $useOpenID = isset($Config['OpenID']) && $Config['OpenID'];
 if ($useOpenID) {
     require_once('Auth/OpenID/Consumer.php');
     require_once('Auth/OpenID/FileStore.php');
 }
 
 /**
  * Gets an Auth_OpenID_Consumer instance
  *
  * @return Auth_OpenID_Consumer the instance
  */
 function get_openid_consumer () {
     if (!file_exists('/dev/urandom')) {
         //We don't have a reliable source of random numbers
         define('Auth_OpenID_RAND_SOURCE', null);
     }
 
     $fs = new Auth_OpenID_FileStore(CACHE_DIR . '/openid');
     return new Auth_OpenID_Consumer($fs);
 }
 
 /**
  * Logs in the user if the OpenID is recognized.
  * Otherwise, sets an error message.
  *
  * @param string $url The OpenID URL
  */
 function openid_login ($url) {
     global $db, $_SESSION, $LoginError, $LoginSuccessful;
     $url = $db->escape($url);
     $sql = 'SELECT user_id FROM ' . TABLE_USERS_AUTH
          . " WHERE auth_type = 'OpenID' AND auth_identity LIKE '$url'";
     if ($user_id = $db->queryScalar($sql)) {
         $sql = "UPDATE " . TABLE_SESSIONS . " SET user_id = '$user_id' WHERE session_id LIKE '$_SESSION[ID]'";
         if (!$db->query($sql)) {
             message_die(SQL_ERROR, "Can't update session table", '', __LINE__, __FILE__, $sql);
         }
         $LoginSuccessful = true;
         setcookie("LastOpenID", $url, time() + 2592000);
         header("location: " . get_url());
     } else {
         $LoginError = "Read the source to get an invite.";
     }
 }
 
 ///
 /// Login procedural code
 ///
 
 $action = isset($_GET['action']) ? $_GET['action'] : '';
 
 if ($action == 'openid.login') {
     //Gets Auth_OpenID_Consumer instance, completes the OpenID transaction
     //and processes the result.
 
-    if (!$useOpenID()) {
+    if (!$useOpenID) {
         header("Status: 403 Forbidden");
         die("OpenID disabled.");
     }
 
     $consumer = get_openid_consumer();
     $reply = $consumer->complete(get_server_url() . $_SERVER['REQUEST_URI']);
 
     if ($reply->status == Auth_OpenID_SUCCESS) {
         openid_login($reply->endpoint->claimed_id);
     } elseif ($reply->message) {
         //TODO: $reply->message could be rather long and won't fit in the UI
         //space. You can wish to add code to print $LoginError elsewhere if
         //too long.
         $LoginError = "[OpenID] $reply->message";
     } else {
         $LoginError = "[OpenID] $reply->status";
     }
 } elseif (isset($_POST['LogIn'])) {
     //User have filled login form
     if ($_POST['openid'] && $useOpenID) {
         //Gets Auth_OpenID_Consumer instance
         $consumer = get_openid_consumer();
 
         //Starts the OpenID transaction and redirects user to provider url
         if ($request = $consumer->begin($_POST['openid'])) {
             $url = $request->redirectURL(get_server_url(), "$Config[SiteURL]/?action=openid.login", false);
             header("location: $url");
             $LoginError = '<a href="' . $url . '">Click here to continue login</a>';
         } else {
             $LoginError = 'Invalid OpenID URL.';
         }
     } else {
         //Login
 
         //Authentications way, the user/password in last.
         //OpenID is handled by a separate logic.
         $Login = $_POST['username'];
         $authentications = [];
         if ($useYubiCloud = array_key_exists('YubiCloud', $Config) ) {
             $authentications[] = new YubiCloudAuthentication($_POST['password'], $Login);
         }
         if ($Login) {
             $authentications[] = new UserPasswordAuthentication($Login, $_POST['password']);
         }
 
         $loginSuccessful = false;
         foreach ($authentications as $authentication) {
             if ($authentication->isValid()) {
                 $loginSuccessful = true;
                 //Logs in user
                 login($authentication->getUserID(), $Login);
             } else {
                 $loginError = $authentication->getError();
             }
             if (!$authentication->canTryNextAuthenticationMethod()) {
                 break;
             }
         }
 
         //Tests if the password wouldn't match an invite code
         //If so, redirects people using login page as invitation claim page
-        if (!$LoginSuccessful) {
+        if (!$loginSuccessful) {
             $code = $db->escape($_POST['password']);
             $sql = "SELECT * FROM " . TABLE_USERS_INVITES . " WHERE invite_code = '$code'";
             if (!$result = $db->query($sql)) {
                 message_die(SQL_ERROR, "Can't get invites", '', __LINE__, __FILE__, $sql);
             }
             if ($row = $db->fetchRow($result)) {
                 $url = get_url('invite', $_POST['password']);
                 header('location: ' . $url);
             }
         }
     }
 } elseif (isset($_POST['LogOut']) || $action == "user.logout") {
     Logout();
 }