diff --git a/action.php b/action.php
index 654828d..132dc3c 100644
--- a/action.php
+++ b/action.php
@@ -1,15 +1,19 @@
 <?php
 
+use dokuwiki\Extension\ActionPlugin;
+use dokuwiki\Extension\EventHandler;
+use dokuwiki\Extension\Event;
+
 /**
  * DokuWiki Plugin lms (Action Component)
  *
  * @license GPL 2 http://www.gnu.org/licenses/gpl-2.0.html
  * @author  Andreas Gohr <dokuwiki@cosmocode.de>
  */
-class action_plugin_lms extends \dokuwiki\Extension\ActionPlugin
+class action_plugin_lms extends ActionPlugin
 {
     /** @inheritDoc */
-    public function register(Doku_Event_Handler $controller)
+    public function register(EventHandler $controller)
     {
         $controller->register_hook('DOKUWIKI_STARTED', 'AFTER', $this, 'handleStart');
         $controller->register_hook('ACTION_ACT_PREPROCESS', 'BEFORE', $this, 'handleAction');
@@ -23,7 +27,7 @@ public function register(Doku_Event_Handler $controller)
      * @param mixed $param optional parameter passed when event was registered
      * @return void
      */
-    public function handleStart(Doku_Event $event, $param)
+    public function handleStart(Event $event, $param)
     {
         global $JSINFO;
         global $INPUT;
@@ -45,7 +49,7 @@ public function handleStart(Doku_Event $event, $param)
      * @param mixed $param optional parameter passed when event was registered
      * @return void
      */
-    public function handleAction(Doku_Event $event, $param)
+    public function handleAction(Event $event, $param)
     {
         global $INPUT;
         global $ID;
@@ -89,7 +93,7 @@ public function handleAction(Doku_Event $event, $param)
      * @param Doku_Event $event
      * @return void
      */
-    public function handleAdminAjax(Doku_Event $event)
+    public function handleAdminAjax(Event $event)
     {
         if ($event->data !== 'plugin_lms_autocomplete') return;
         global $INPUT;
diff --git a/admin.php b/admin.php
index a9de4c1..06cd63c 100644
--- a/admin.php
+++ b/admin.php
@@ -1,12 +1,15 @@
 <?php
 
+use dokuwiki\Extension\AdminPlugin;
+use dokuwiki\Form\Form;
+
 /**
  * DokuWiki Plugin lms (Admin Component)
  *
  * @license GPL 2 http://www.gnu.org/licenses/gpl-2.0.html
  * @author  Andreas Gohr <dokuwiki@cosmocode.de>
  */
-class admin_plugin_lms extends \dokuwiki\Extension\AdminPlugin
+class admin_plugin_lms extends AdminPlugin
 {
     /** @inheritDoc */
     public function forAdminOnly()
@@ -27,7 +30,7 @@ public function html()
 
         echo '<h1>' . $this->getLang('menu') . '</h1>';
 
-        $form = new dokuwiki\Form\Form(['method' => 'POST', 'id' => 'lms__admin-autocomplete']);
+        $form = new Form(['method' => 'POST', 'id' => 'lms__admin-autocomplete']);
         $form->addTextInput('user', $this->getLang('username'));
         $form->addButton('submit', '🔍');
         echo '<p>' . $form->toHTML() . '</p>';
diff --git a/helper.php b/helper.php
index 323b753..0e6b489 100644
--- a/helper.php
+++ b/helper.php
@@ -1,12 +1,14 @@
 <?php
 
+use dokuwiki\Extension\Plugin;
+
 /**
  * DokuWiki Plugin lms (Helper Component)
  *
  * @license GPL 2 http://www.gnu.org/licenses/gpl-2.0.html
  * @author  Andreas Gohr <dokuwiki@cosmocode.de>
  */
-class helper_plugin_lms extends \dokuwiki\Extension\Plugin
+class helper_plugin_lms extends Plugin
 {
     /**
      * Return all lessons and info about the user's current completion status
@@ -76,7 +78,7 @@ public function getUserLessons($user)
         $lessons = [];
         $lines = file($file);
         foreach ($lines as $line) {
-            list($time, $id, $seen) = explode("\t", trim($line));
+            [$time, $id, $seen] = explode("\t", trim($line));
 
             // we use simple log files
             if ($seen) {
@@ -99,7 +101,7 @@ public function getUserLessons($user)
     public function getLesson($id, $user)
     {
         $all = $this->getLessons($user);
-        return isset($all[$id]) ? $all[$id] : false;
+        return $all[$id] ?? false;
     }
 
     /**
diff --git a/syntax/include.php b/syntax/include.php
index 5d98a71..316bb46 100644
--- a/syntax/include.php
+++ b/syntax/include.php
@@ -1,12 +1,14 @@
 <?php
 
+use dokuwiki\Extension\SyntaxPlugin;
+
 /**
  * DokuWiki Plugin lms (Syntax Component)
  *
  * @license GPL 2 http://www.gnu.org/licenses/gpl-2.0.html
  * @author  Andreas Gohr <dokuwiki@cosmocode.de>
  */
-class syntax_plugin_lms_include extends \dokuwiki\Extension\SyntaxPlugin
+class syntax_plugin_lms_include extends SyntaxPlugin
 {
     /** @var helper_plugin_lms */
     protected $hlp;
@@ -51,7 +53,7 @@ public function connectTo($mode)
     /** @inheritDoc */
     public function handle($match, $state, $pos, Doku_Handler $handler)
     {
-        $data = array();
+        $data = [];
 
         return $data;
     }
diff --git a/syntax/lms.php b/syntax/lms.php
index 64cc57f..c235bda 100644
--- a/syntax/lms.php
+++ b/syntax/lms.php
@@ -1,12 +1,14 @@
 <?php
 
+use dokuwiki\Extension\SyntaxPlugin;
+
 /**
  * DokuWiki Plugin lms (Syntax Component)
  *
  * @license GPL 2 http://www.gnu.org/licenses/gpl-2.0.html
  * @author  Andreas Gohr <dokuwiki@cosmocode.de>
  */
-class syntax_plugin_lms_lms extends \dokuwiki\Extension\SyntaxPlugin
+class syntax_plugin_lms_lms extends SyntaxPlugin
 {
     /** @var helper_plugin_lms */
     protected $hlp;
@@ -51,7 +53,7 @@ public function connectTo($mode)
     /** @inheritDoc */
     public function handle($match, $state, $pos, Doku_Handler $handler)
     {
-        $data = array();
+        $data = [];
 
         return $data;
     }