diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index f4fe17c..4406550 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -4,7 +4,7 @@ on: [push, pull_request]
 
 jobs:
   test:
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-latest
 
     services:
       mysql:
@@ -18,13 +18,27 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        php: [8.0, 8.1]
-        moodle-branch: [MOODLE_401_STABLE, MOODLE_402_STABLE, master]
-        database: [mysqli]
+        include:
+          # Always the max supported PHP version on every branch.
+          - php: 8.3
+            moodle-branch: main
+            database: mysqli
+          - php: 8.3
+            moodle-branch: MOODLE_404_STABLE
+            database: mysqli
+          - php: 8.2
+            moodle-branch: MOODLE_403_STABLE
+            database: mysqli
+          - php: 8.2
+            moodle-branch: MOODLE_402_STABLE
+            database: mysqli
+          - php: 8.1
+            moodle-branch: MOODLE_401_STABLE
+            database: mysqli
 
     steps:
       - name: Check out repository code
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           path: plugin
 
@@ -53,48 +67,42 @@ jobs:
           IGNORE_PATHS: tests/fixtures
 
       - name: PHP Lint
-        if: ${{ always() }}
+        if: ${{ !cancelled() }}
         run: moodle-plugin-ci phplint
 
-      - name: PHP Copy/Paste Detector
-        continue-on-error: true # This step will show errors but will not fail
-        if: ${{ always() }}
-        run: moodle-plugin-ci phpcpd
-
       - name: PHP Mess Detector
         continue-on-error: true # This step will show errors but will not fail
-        if: ${{ always() }}
+        if: ${{ !cancelled() }}
         run: moodle-plugin-ci phpmd
 
       - name: Moodle Code Checker
-        if: ${{ always() }}
-        run: moodle-plugin-ci codechecker
-
-      # Disabled, it needs real fixes.
-      #- name: Moodle PHPDoc Checker
-      #  if: ${{ always() }}
-      #  run: moodle-plugin-ci phpdoc
+        if: ${{ !cancelled() }}
+        run: moodle-plugin-ci codechecker --max-warnings 0
 
       - name: Validating
-        if: ${{ always() }}
+        if: ${{ !cancelled() }}
         run: moodle-plugin-ci validate
 
       - name: Check upgrade savepoints
-        if: ${{ always() }}
+        if: ${{ !cancelled() }}
         run: moodle-plugin-ci savepoints
 
       - name: Mustache Lint
-        if: ${{ always() }}
+        if: ${{ !cancelled() }}
         run: moodle-plugin-ci mustache
 
       - name: Grunt
-        if: ${{ always() }}
+        if: ${{ !cancelled() }}
         run: moodle-plugin-ci grunt --max-lint-warnings 0
 
       - name: PHPUnit tests
-        if: ${{ always() }}
+        if: ${{ !cancelled() }}
         run: moodle-plugin-ci phpunit
 
       - name: Behat features
-        if: ${{ always() }}
+        if: ${{ !cancelled() }}
         run: moodle-plugin-ci behat --profile chrome
+
+      - name: Mark cancelled jobs as failed.
+        if: ${{ cancelled() }}
+        run: exit 1
diff --git a/admin/jabber-aliases-search.php b/admin/jabber-aliases-search.php
index b269014..2e069dc 100644
--- a/admin/jabber-aliases-search.php
+++ b/admin/jabber-aliases-search.php
@@ -1,5 +1,5 @@
 <?php
-// This file is part of Moodle - http://moodle.org/
+// This file is part of Moodle - https://moodle.org/
 //
 // Moodle is free software: you can redistribute it and/or modify
 // it under the terms of the GNU General Public License as published by
@@ -12,7 +12,7 @@
 // GNU General Public License for more details.
 //
 // You should have received a copy of the GNU General Public License
-// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+// along with Moodle.  If not, see <https://www.gnu.org/licenses/>.
 
 /**
  * AJAX search for the user on jabber aliases search..
@@ -21,7 +21,7 @@
  *
  * @package     local_chatlogs
  * @copyright   2012 David Mudrak <david@moodle.com>
- * @license     http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ * @license     https://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
 
 define('AJAX_SCRIPT', true);
@@ -44,7 +44,7 @@
 $response = new stdClass();
 $response->status = 'ok';
 $response->query = $query;
-$response->results = array();
+$response->results = [];
 
 if (!empty($query)) {
 
@@ -63,33 +63,33 @@
                   FROM {user}
                  WHERE ".$DB->sql_like("firstname", "?", false, false)."
                        AND ".$DB->sql_like("lastname", "?", false, false);
-        $params = array(
+        $params = [
             $DB->sql_like_escape($parts[0]).'%',
-            $DB->sql_like_escape($parts[1]).'%'
-        );
+            $DB->sql_like_escape($parts[1]).'%',
+        ];
     } else {
         $sql = "SELECT id, firstname, lastname, email
                   FROM {user}
                  WHERE ".$DB->sql_like("firstname", "?", false, false)."
                        OR ".$DB->sql_like("lastname", "?", false, false)."
                        OR ".$DB->sql_like("email", "?", false, false);
-        $params = array(
+        $params = [
             '%'.$DB->sql_like_escape($query).'%',
             '%'.$DB->sql_like_escape($query).'%',
-            '%'.$DB->sql_like_escape($query).'%'
-        );
+            '%'.$DB->sql_like_escape($query).'%',
+        ];
     }
 
     $rs = $DB->get_recordset_sql($sql, $params, 0, 10);
 
     foreach ($rs as $r) {
-        $response->results[] = (object)array(
+        $response->results[] = (object)[
             'userid'    => $r->id,
             'firstname' => $r->firstname,
             'lastname'  => $r->lastname,
             'email'     => $r->email,
             'signature' => sprintf('%s <%s>', fullname($r), $r->email),
-        );
+        ];
     }
 
     $rs->close();
diff --git a/admin/jabber-aliases.php b/admin/jabber-aliases.php
index a05a6be..8873d62 100644
--- a/admin/jabber-aliases.php
+++ b/admin/jabber-aliases.php
@@ -1,5 +1,5 @@
 <?php
-// This file is part of Moodle - http://moodle.org/
+// This file is part of Moodle - https://moodle.org/
 //
 // Moodle is free software: you can redistribute it and/or modify
 // it under the terms of the GNU General Public License as published by
@@ -12,7 +12,7 @@
 // GNU General Public License for more details.
 //
 // You should have received a copy of the GNU General Public License
-// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+// along with Moodle.  If not, see <https://www.gnu.org/licenses/>.
 
 /**
  * Displays the list of jabber users and lets the user to assign them to real user accounts
@@ -21,7 +21,7 @@
  *
  * @package     local_chatlogs
  * @copyright   2012 Dan Poltawski <dan@moodle.com>
- * @license     http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ * @license     https://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
 
 require(dirname(dirname(dirname(dirname(__FILE__)))).'/config.php');
@@ -45,7 +45,7 @@
     if (!empty($userid)) {
         $status = link_jabberid_to_user($jabberid, $userid);
         if ($status === false) {
-            print_error('failed');
+            throw new moodle_exception('failed');
         }
     }
     redirect($PAGE->url);
@@ -64,32 +64,32 @@
 
 $table = new html_table();
 $table->id = 'aliaseseditor';
-$table->head = array(
+$table->head = [
     get_string('jabberfullname', 'local_chatlogs'),
     get_string('jabberid', 'local_chatlogs'),
     get_string('jabberaliasesassign', 'local_chatlogs'),
-);
+];
 
 
 foreach ($rs as $record) {
-    $table->data[] = array(
-        html_writer::tag('div', s($record->nickname), array('class' => 'aliasdata-authorname')),
-        html_writer::tag('div', s($record->fromemail), array('class' => 'aliasdata-authoremail')),
+    $table->data[] = [
+        html_writer::tag('div', s($record->nickname), ['class' => 'aliasdata-authorname']),
+        html_writer::tag('div', s($record->fromemail), ['class' => 'aliasdata-authoremail']),
         html_writer::tag('form',
             html_writer::tag('div',
-                html_writer::empty_tag('input', array('type' => 'hidden', 'name' => 'jabbernick', 'value' => $record->nickname)).
-                html_writer::empty_tag('input', array('type' => 'hidden', 'name' => 'jabberid', 'value' => $record->fromemail)).
-                html_writer::empty_tag('input', array('type' => 'hidden', 'name' => 'sesskey', 'value' => sesskey())).
-                html_writer::empty_tag('input', array('type' => 'text', 'name' => 'search', 'class' => 'aliasdata-search',
-                    'maxlength' => 100, 'size' => 50)).
-                html_writer::empty_tag('input', array('type' => 'text', 'name' => 'userid', 'class' => 'aliasdata-userid',
-                    'maxlength' => 100, 'size' => 5)).
-                html_writer::empty_tag('input', array('type' => 'submit', 'value' => get_string('submit'))).
-                html_writer::empty_tag('input', array('type' => 'reset', 'value' => get_string('reset'))).
-                html_writer::tag('span', ' ', array('class' => 'aliasdata-icon'))
+                html_writer::empty_tag('input', ['type' => 'hidden', 'name' => 'jabbernick', 'value' => $record->nickname]).
+                html_writer::empty_tag('input', ['type' => 'hidden', 'name' => 'jabberid', 'value' => $record->fromemail]).
+                html_writer::empty_tag('input', ['type' => 'hidden', 'name' => 'sesskey', 'value' => sesskey()]).
+                html_writer::empty_tag('input', ['type' => 'text', 'name' => 'search', 'class' => 'aliasdata-search',
+                    'maxlength' => 100, 'size' => 50]).
+                html_writer::empty_tag('input', ['type' => 'text', 'name' => 'userid', 'class' => 'aliasdata-userid',
+                    'maxlength' => 100, 'size' => 5]).
+                html_writer::empty_tag('input', ['type' => 'submit', 'value' => get_string('submit')]).
+                html_writer::empty_tag('input', ['type' => 'reset', 'value' => get_string('reset')]).
+                html_writer::tag('span', ' ', ['class' => 'aliasdata-icon'])
             ),
-        array('method' => 'post', 'action' => $PAGE->url->out()))
-    );
+        ['method' => 'post', 'action' => $PAGE->url->out()]),
+    ];
 }
 echo html_writer::table($table);
 $rs->close();
@@ -105,11 +105,11 @@
 function link_jabberid_to_user($jabberid, $userid) {
     global $DB;
 
-    if (is_null($userid) or is_null($jabberid)) {
+    if (is_null($userid) || is_null($jabberid)) {
         throw new coding_exception('NULL parameter values not allowed here');
     }
 
-    $record = $DB->get_record('local_chatlogs_participants', array('fromemail' => $jabberid));
+    $record = $DB->get_record('local_chatlogs_participants', ['fromemail' => $jabberid]);
 
     if ($record) {
         $record->userid = $userid;
diff --git a/adminlib.php b/adminlib.php
index 9b605c8..d298828 100644
--- a/adminlib.php
+++ b/adminlib.php
@@ -1,5 +1,5 @@
 <?php
-// This file is part of Moodle - http://moodle.org/
+// This file is part of Moodle - https://moodle.org/
 //
 // Moodle is free software: you can redistribute it and/or modify
 // it under the terms of the GNU General Public License as published by
@@ -12,33 +12,25 @@
 // GNU General Public License for more details.
 //
 // You should have received a copy of the GNU General Public License
-// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+// along with Moodle.  If not, see <https://www.gnu.org/licenses/>.
 
 /**
- * Admin tree class for lazyloading config box
- *
- * @package     local_chatlogs
- * @copyright   2012 Dan Poltawski <dan@moodle.com>
- * @license     http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
- */
-
-defined('MOODLE_INTERNAL') || die();
-
-/**
- * admin_setting_configselect for the seleted cohort
- * simply so we can lazy-load the choices.
+ * admin_setting_configselect for the seleted cohort, so we can lazy-load the choices.
  *
+ * @package   local_chatlogs
  * @copyright Dan Poltawski <dan@moodle.com>
- * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ * @license   https://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
 class local_chatlogs_cohort_selector extends admin_setting_configselect {
 
-    /** Lazy-load the available choices for the select box */
+    /**
+     * Lazy-load the available choices for the select box
+     */
     public function load_choices() {
         global $DB;
 
-        $this->choices = array(0 => get_string('none'));
-        if ($cohorts = $DB->get_records_menu('cohort', array('contextid' => context_system::instance()->id), 'name', 'id, name')) {
+        $this->choices = [0 => get_string('none')];
+        if ($cohorts = $DB->get_records_menu('cohort', ['contextid' => context_system::instance()->id], 'name', 'id, name')) {
             foreach ($cohorts as $key => $value) {
                 $this->choices[$key] = $value;
             }
diff --git a/classes/privacy/provider.php b/classes/privacy/provider.php
index 849ff29..6261363 100644
--- a/classes/privacy/provider.php
+++ b/classes/privacy/provider.php
@@ -1,5 +1,5 @@
 <?php
-// This file is part of Moodle - http://moodle.org/
+// This file is part of Moodle - https://moodle.org/
 //
 // Moodle is free software: you can redistribute it and/or modify
 // it under the terms of the GNU General Public License as published by
@@ -12,21 +12,19 @@
 // GNU General Public License for more details.
 //
 // You should have received a copy of the GNU General Public License
-// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+// along with Moodle.  If not, see <https://www.gnu.org/licenses/>.
 
 /**
- * Defines {@link \local_chatlogs\privacy\provider} class.
+ * Defines {@see \local_chatlogs\privacy\provider} class.
  *
  * @package     local_chatlogs
  * @category    privacy
  * @copyright   2018 David Mudrák <david@moodle.com>
- * @license     http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ * @license     https://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
 
 namespace local_chatlogs\privacy;
 
-defined('MOODLE_INTERNAL') || die();
-
 use core_privacy\local\metadata\collection;
 use core_privacy\local\request\approved_contextlist;
 use core_privacy\local\request\contextlist;
@@ -38,7 +36,7 @@
  * Privacy API implementation for the Developer chat plugin.
  *
  * @copyright  2018 David Mudrák <david@moodle.com>
- * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ * @license    https://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
 class provider implements
         \core_privacy\local\metadata\provider,
@@ -50,7 +48,7 @@ class provider implements
      * @param collection $collection Collection of items to add metadata to.
      * @return collection Collection with our added items.
      */
-    public static function get_metadata(collection $collection) : collection {
+    public static function get_metadata(collection $collection): collection {
 
         $collection->add_database_table('local_chatlogs_messages', [
            'conversationid' => 'privacy:metadata:db:messages:conversationid',
@@ -76,7 +74,7 @@ public static function get_metadata(collection $collection) : collection {
      * @param int $userid ID of the user.
      * @return contextlist List of contexts containing the user's personal data.
      */
-    public static function get_contexts_for_userid(int $userid) : contextlist {
+    public static function get_contexts_for_userid(int $userid): contextlist {
 
         $contextlist = new contextlist();
         $contextlist->add_system_context();
diff --git a/classes/task/sync_chatlogs.php b/classes/task/sync_chatlogs.php
index 06170d0..8772763 100644
--- a/classes/task/sync_chatlogs.php
+++ b/classes/task/sync_chatlogs.php
@@ -1,5 +1,5 @@
 <?php
-// This file is part of Moodle - http://moodle.org/
+// This file is part of Moodle - https://moodle.org/
 //
 // Moodle is free software: you can redistribute it and/or modify
 // it under the terms of the GNU General Public License as published by
@@ -12,24 +12,23 @@
 // GNU General Public License for more details.
 //
 // You should have received a copy of the GNU General Public License
-// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+// along with Moodle.  If not, see <https://www.gnu.org/licenses/>.
 
 /**
  * A scheduled task for syning chatlogs from the remote api.
  *
  * @package    local_chatlogs
  * @copyright  2017 Dan Poltawski <dan@moodle.com>
- * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ * @license    https://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
 namespace local_chatlogs\task;
-defined('MOODLE_INTERNAL') || die();
 
 /**
  * A scheduled task for syning chatlogs from the remote api.
  *
  * @package    local_chatlogs
  * @copyright  2017 Dan Poltawski <dan@moodle.com>
- * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ * @license    https://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
 class sync_chatlogs extends \core\task\scheduled_task {
     /**
diff --git a/classes/telegram_importer.php b/classes/telegram_importer.php
index 992a267..1561a9e 100644
--- a/classes/telegram_importer.php
+++ b/classes/telegram_importer.php
@@ -1,5 +1,5 @@
 <?php
-// This file is part of Moodle - http://moodle.org/
+// This file is part of Moodle - https://moodle.org/
 //
 // Moodle is free software: you can redistribute it and/or modify
 // it under the terms of the GNU General Public License as published by
@@ -12,14 +12,14 @@
 // GNU General Public License for more details.
 //
 // You should have received a copy of the GNU General Public License
-// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+// along with Moodle.  If not, see <https://www.gnu.org/licenses/>.
 
 /**
  * Imports logs from a simple json api provided by hubot-log-to-pgsql.
  *
  * @package     local_chatlogs
  * @copyright   2017 Dan Poltawski <dan@moodle.com>
- * @license     http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ * @license     https://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
 
 namespace local_chatlogs;
@@ -33,7 +33,7 @@
  *
  * @package     local_chatlogs
  * @copyright   2017 Dan Poltawski <dan@moodle.com>
- * @license     http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ * @license     https://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
 class telegram_importer {
     /** @var int Number of seconds between conversations to start a new one */
@@ -114,7 +114,7 @@ public function import() {
     /**
      * Utility to strip probematic 4-byte utf8 chars for use in MDL-48228 workaround.
      *
-     * Thanks http://stackoverflow.com/a/16496799
+     * Thanks https://stackoverflow.com/a/16496799
      *
      * @param string $string to strip 4-byte utf8 count_chars
      * @param string $replacement
@@ -190,8 +190,8 @@ protected function format_telegram_message($input) {
         // the timestamp stored with microseconds precision, which is important
         // for ensuring that we don't retrieve the same chat message twice.
         // $message->timestamp - traditional Moodle timestamp (Seconds since the Unix Epoch)
-        // $message->timejava - microseconds since unix epoch (so that we can later)
-        $d = new \DateTime($input->timestamp); // Input is ISO-8601 formated timestamp
+        // $message->timejava - microseconds since unix epoch (so that we can later).
+        $d = new \DateTime($input->timestamp); // Input is ISO-8601 formated timestamp.
         $timestamp = $d->format('U'); // Time since epoch.
         $miliseconds = $d->format('u') / 1000; // If php7 we could use ->format('v').
         $milisecondepoch = floor(($timestamp * 1000) + $miliseconds);
diff --git a/classes/urlfilter.php b/classes/urlfilter.php
index dce651b..83ea838 100644
--- a/classes/urlfilter.php
+++ b/classes/urlfilter.php
@@ -1,5 +1,5 @@
 <?php
-// This file is part of Moodle - http://moodle.org/
+// This file is part of Moodle - https://moodle.org/
 //
 // Moodle is free software: you can redistribute it and/or modify
 // it under the terms of the GNU General Public License as published by
@@ -12,14 +12,14 @@
 // GNU General Public License for more details.
 //
 // You should have received a copy of the GNU General Public License
-// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+// along with Moodle.  If not, see <https://www.gnu.org/licenses/>.
 
 /**
  * Wrapper around urltolink filter to access its abilities.
  *
  * @package     local_chatlogs
  * @copyright   2015 Dan Poltawski <dan@moodle.com>
- * @license     http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ * @license     https://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
 
 namespace local_chatlogs;
@@ -30,16 +30,26 @@
 /**
  * Lang import controller
  *
- * @package    tool_langimport
+ * @package    local_chatlogs
  * @copyright  2014 Dan Poltawski <dan@moodle.com>
- * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ * @license    https://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
 class urlfilter extends \filter_urltolink {
+
+    /**
+     * Create a new instance
+     */
     public function __construct() {
         self::$globalconfig = new \stdClass();
         self::$globalconfig->embedimages = false;
     }
-    public function convert_urls_into_links(&$text) {
+
+    /**
+     * Convert all the URLs in a text to working links.
+     *
+     * @param string $text The text which URLs have to be converted to working links. By reference.
+     */
+    public function convert_urls_into_links(&$text) { // phpcs:ignore Generic.CodeAnalysis.UselessOverridingMethod.Found
         parent::convert_urls_into_links($text);
     }
 }
diff --git a/cli/dumpconversation.php b/cli/dumpconversation.php
index 81d2035..fcc95ba 100644
--- a/cli/dumpconversation.php
+++ b/cli/dumpconversation.php
@@ -1,5 +1,5 @@
 <?php
-// This file is part of Moodle - http://moodle.org/
+// This file is part of Moodle - https://moodle.org/
 //
 // Moodle is free software: you can redistribute it and/or modify
 // it under the terms of the GNU General Public License as published by
@@ -12,13 +12,15 @@
 // GNU General Public License for more details.
 //
 // You should have received a copy of the GNU General Public License
-// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+// along with Moodle.  If not, see <https://www.gnu.org/licenses/>.
 
 /**
+ * CLI script to dump a given conversation to standard output.
+ *
  * @package     local_chatlogs
  * @subpackage  cli
  * @copyright   2014 David Mudrak <david@moodle.com>
- * @license     http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ * @license     https://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
 
 define('CLI_SCRIPT', true);
@@ -42,15 +44,16 @@
 ";
 
 list($options, $unrecognized) = cli_get_params(
-    array(
+    [
         'help' => false,
         'format' => 'mediawiki',
-    ), array(
+    ],
+    [
         'h' => 'help',
-    )
+    ],
 );
 
-if (!empty($options['help']) or count($unrecognized) <> 1) {
+if (!empty($options['help']) || count($unrecognized) <> 1) {
     cli_error($usage);
 }
 
@@ -74,7 +77,7 @@
          WHERE m.conversationid = :conversationid
          ORDER BY m.timesent";
 
-$rs = $DB->get_recordset_sql($sql, array('conversationid' => $conversationid));
+$rs = $DB->get_recordset_sql($sql, ['conversationid' => $conversationid]);
 
 if (!$rs->valid()) {
     cli_error('No data found');
@@ -108,6 +111,8 @@
  */
 
 /**
+ * Return the formatted header.
+ *
  * @param string $format
  * @return string
  */
@@ -119,6 +124,8 @@ function local_chatlogs_dumpconversation_header($format) {
 }
 
 /**
+ * Return the formatted footer.
+ *
  * @param string $format
  * @return string
  */
@@ -130,6 +137,8 @@ function local_chatlogs_dumpconversation_footer($format) {
 }
 
 /**
+ * Return a formatted message.
+ *
  * @param stdClass $message
  * @param string $format
  * @return string
diff --git a/db/access.php b/db/access.php
index fe38a29..4dafd0a 100644
--- a/db/access.php
+++ b/db/access.php
@@ -1,5 +1,5 @@
 <?php
-// This file is part of Moodle - http://moodle.org/
+// This file is part of Moodle - https://moodle.org/
 //
 // Moodle is free software: you can redistribute it and/or modify
 // it under the terms of the GNU General Public License as published by
@@ -12,7 +12,7 @@
 // GNU General Public License for more details.
 //
 // You should have received a copy of the GNU General Public License
-// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+// along with Moodle.  If not, see <https://www.gnu.org/licenses/>.
 
 /**
  * Capability definitions for the chat logs plugin
@@ -20,25 +20,25 @@
  * @package     local_chatlogs
  * @category    access
  * @copyright   2012 Dan Poltawski <dan@moodle.com>
- * @license     http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ * @license     https://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
 
 defined('MOODLE_INTERNAL') || die();
 
-$capabilities = array(
+$capabilities = [
 
     // Ability to view chatlogs irrespective of cohort memebership.
-    'local/chatlogs:view' => array(
+    'local/chatlogs:view' => [
         'captype' => 'read',
         'contextlevel' => CONTEXT_SYSTEM,
-        'legacy' => array()
-    ),
+        'legacy' => [],
+    ],
 
     // Ability to view chatlogs if developer cohort.
-    'local/chatlogs:viewifdeveloper' => array(
+    'local/chatlogs:viewifdeveloper' => [
         'captype' => 'read',
         'contextlevel' => CONTEXT_SYSTEM,
-        'legacy' => array()
-    ),
+        'legacy' => [],
+    ],
 
-);
+];
diff --git a/db/install.php b/db/install.php
index 57a3bdc..aab996f 100644
--- a/db/install.php
+++ b/db/install.php
@@ -1,5 +1,5 @@
 <?php
-// This file is part of Moodle - http://moodle.org/
+// This file is part of Moodle - https://moodle.org/
 //
 // Moodle is free software: you can redistribute it and/or modify
 // it under the terms of the GNU General Public License as published by
@@ -12,18 +12,16 @@
 // GNU General Public License for more details.
 //
 // You should have received a copy of the GNU General Public License
-// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+// along with Moodle.  If not, see <https://www.gnu.org/licenses/>.
 
 /**
  * Post installation and migration code.
  *
  * @package    local_chatlogs
  * @copyright  2012 Dan Poltawski <dan@moodle.com>
- * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ * @license    https://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
 
-defined('MOODLE_INTERNAL') || die;
-
 /**
  * Installation step for chatlogs plugin.
  *
diff --git a/db/install.xml b/db/install.xml
index 4799935..341a861 100644
--- a/db/install.xml
+++ b/db/install.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8" ?>
 <XMLDB PATH="local/chatlogs/db" VERSION="20120229" COMMENT="XMLDB file for Moodle local/chatlogs"
-    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xmlns:xsi="https://www.w3.org/2001/XMLSchema-instance"
     xsi:noNamespaceSchemaLocation="../../../lib/xmldb/xmldb.xsd"
 >
   <TABLES>
diff --git a/db/tasks.php b/db/tasks.php
index e63b178..b38d30b 100644
--- a/db/tasks.php
+++ b/db/tasks.php
@@ -1,5 +1,5 @@
 <?php
-// This file is part of Moodle - http://moodle.org/
+// This file is part of Moodle - https://moodle.org/
 //
 // Moodle is free software: you can redistribute it and/or modify
 // it under the terms of the GNU General Public License as published by
@@ -12,26 +12,26 @@
 // GNU General Public License for more details.
 //
 // You should have received a copy of the GNU General Public License
-// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+// along with Moodle.  If not, see <https://www.gnu.org/licenses/>.
 
 /**
  * Definition of partner block tasks
  *
  * @package   local_chatlogs
  * @copyright 2017 Dan Poltawski <dan@moodle.com>
- * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ * @license   https://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
 
 defined('MOODLE_INTERNAL') || die();
 
-$tasks = array(
-    array(
+$tasks = [
+    [
         'classname' => 'local_chatlogs\task\sync_chatlogs',
         'blocking' => 0,
         'minute' => '*/5',
         'hour' => '*',
         'day' => '*',
         'dayofweek' => '*',
-        'month' => '*'
-    )
-);
+        'month' => '*',
+    ],
+];
diff --git a/index.php b/index.php
index 4a4daf2..28360c5 100755
--- a/index.php
+++ b/index.php
@@ -1,5 +1,5 @@
 <?php
-// This file is part of Moodle - http://moodle.org/
+// This file is part of Moodle - https://moodle.org/
 //
 // Moodle is free software: you can redistribute it and/or modify
 // it under the terms of the GNU General Public License as published by
@@ -12,14 +12,14 @@
 // GNU General Public License for more details.
 //
 // You should have received a copy of the GNU General Public License
-// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+// along with Moodle.  If not, see <https://www.gnu.org/licenses/>.
 
 /**
  * Displays list of conversations or a specific covnersation depending on params
  *
  * @package     local_chatlogs
  * @copyright   2012 Dan Poltawski <dan@moodle.com>
- * @license     http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ * @license     https://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
 
 require_once('../../config.php');
diff --git a/info.php b/info.php
index 62045d1..5998fc0 100644
--- a/info.php
+++ b/info.php
@@ -1,5 +1,5 @@
 <?php
-// This file is part of Moodle - http://moodle.org/
+// This file is part of Moodle - https://moodle.org/
 //
 // Moodle is free software: you can redistribute it and/or modify
 // it under the terms of the GNU General Public License as published by
@@ -12,14 +12,14 @@
 // GNU General Public License for more details.
 //
 // You should have received a copy of the GNU General Public License
-// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+// along with Moodle.  If not, see <https://www.gnu.org/licenses/>.
 
 /**
  * Displays info of how to get to the chat logs
  *
  * @package     local_chatlogs
  * @copyright   2012 Dan Poltawski <dan@moodle.com>
- * @license     http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ * @license     https://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
 
 require(dirname(dirname(dirname(__FILE__))).'/config.php');
@@ -36,16 +36,10 @@
 echo $OUTPUT->header();
 echo $OUTPUT->heading('Moodle developers chat');
 echo $OUTPUT->box_start('text-center lead');
-?>
+echo html_writer::tag('p', get_string('infohistory', 'local_chatlogs'));
 
-<p>Historically, Moodle developers used a Jabber chat room for synchronous
-discussions. Since February 1st 2017, the chat has been moved to <a
-href="https://telegram.org/">Telegram</a>. Developers are encouraged to join
-the chat at <a href="https://telegram.me/moodledev">telegram.me/moodledev</a>.</p>
+echo html_writer::tag('hr', '');
 
-<hr />
-
-<?php
 echo $OUTPUT->pix_icon('telegram', 'Moodle dev and Telegram logos', 'local_chatlogs',
     ['width' => 118, 'class' => 'img-responsive']);
 echo $OUTPUT->box_end();
diff --git a/lang/en/local_chatlogs.php b/lang/en/local_chatlogs.php
index e447688..553f30d 100644
--- a/lang/en/local_chatlogs.php
+++ b/lang/en/local_chatlogs.php
@@ -1,5 +1,5 @@
 <?php
-// This file is part of Moodle - http://moodle.org/
+// This file is part of Moodle - https://moodle.org/
 //
 // Moodle is free software: you can redistribute it and/or modify
 // it under the terms of the GNU General Public License as published by
@@ -12,7 +12,7 @@
 // GNU General Public License for more details.
 //
 // You should have received a copy of the GNU General Public License
-// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+// along with Moodle.  If not, see <https://www.gnu.org/licenses/>.
 
 /**
  * Lang file for local_chatlogs plugin
@@ -20,7 +20,7 @@
  * @package     local_chatlogs
  * @category    string
  * @copyright   2012 Dan Poltawski <dan@moodle.com>
- * @license     http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ * @license     https://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
 
 defined('MOODLE_INTERNAL') || die();
@@ -33,14 +33,20 @@
 $string['chatlogs:manage'] = 'Manage the developer chat logs plugin';
 $string['chatlogs:view'] = 'View developer chat logs irrespective of cohort membership';
 $string['chatlogs:viewifdeveloper'] = 'View developer chat logs if in developer cohort';
-$string['developerconversations'] = 'Chat history';
 $string['developercohort'] = 'Developer cohort';
 $string['developercohortdescription'] = 'Select the cohort which developers are in. Users in this cohort and with the local/chatlogs:viewifdeveloper capability will be able to view the chatlogs';
+$string['developerconversations'] = 'Chat history';
 $string['info'] = 'Info';
+$string['infohistory'] = 'Historically, Moodle developers used a Jabber chat room for synchronous
+discussions. Since 2017, the chat was moved to <a href="https://telegram.org/">Telegram</a>.
+And later, in 2022, it was decided to move everything to <a href="https://matrix.org/">Matrix</a>.
+Developers are encouraged to join the chat at <a href="https://telegram.me/moodledev">telegram.me/moodledev</a> or
+<a href="https://matrix.to/#/#moodledev:moodle.com">matrix.to/#/#moodledev:moodle.com</a>.
+Both rooms are bridged, so you can use either one.';
 $string['jabberaliases'] = 'Aliases';
 $string['jabberaliasesassign'] = 'Assign user';
-$string['jabberid'] = 'ID';
 $string['jabberfullname'] = 'Nick';
+$string['jabberid'] = 'ID';
 $string['pluginname'] = 'Developer chat';
 $string['privacy:metadata:db:messages'] = 'Stores copies of developer chat discussions';
 $string['privacy:metadata:db:messages:conversationid'] = 'Internal identifier of the conversation';
diff --git a/lib.php b/lib.php
index c4e6420..8c8a912 100644
--- a/lib.php
+++ b/lib.php
@@ -1,5 +1,5 @@
 <?php
-// This file is part of Moodle - http://moodle.org/
+// This file is part of Moodle - https://moodle.org/
 //
 // Moodle is free software: you can redistribute it and/or modify
 // it under the terms of the GNU General Public License as published by
@@ -12,18 +12,16 @@
 // GNU General Public License for more details.
 //
 // You should have received a copy of the GNU General Public License
-// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+// along with Moodle.  If not, see <https://www.gnu.org/licenses/>.
 
 /**
  * The plugin's external API is defined here
  *
  * @package     local_chatlogs
  * @copyright   2012 Dan Poltawski <dan@moodle.com>
- * @license     http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ * @license     https://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
 
-defined('MOODLE_INTERNAL') || die();
-
 /**
  * Determines whether the current user can access chatlogs
  *
@@ -43,7 +41,7 @@ function local_chatlogs_can_access() {
         if ($cohortid = get_config('local_chatlogs', 'cohortid')) {
             if ($cohortid > 0) {
                 // Only allowed to view if in developer cohort.
-                if ($DB->get_record('cohort_members', array('cohortid' => $cohortid, 'userid' => $USER->id))) {
+                if ($DB->get_record('cohort_members', ['cohortid' => $cohortid, 'userid' => $USER->id])) {
                     return true;
                 }
             }
diff --git a/locallib.php b/locallib.php
index 6619c19..85db752 100644
--- a/locallib.php
+++ b/locallib.php
@@ -1,5 +1,5 @@
 <?php
-// This file is part of Moodle - http://moodle.org/
+// This file is part of Moodle - https://moodle.org/
 //
 // Moodle is free software: you can redistribute it and/or modify
 // it under the terms of the GNU General Public License as published by
@@ -12,14 +12,14 @@
 // GNU General Public License for more details.
 //
 // You should have received a copy of the GNU General Public License
-// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+// along with Moodle.  If not, see <https://www.gnu.org/licenses/>.
 
 /**
  * Provides library functions used by plugin
  *
  * @package     local_chatlogs
  * @copyright   2012 Dan Poltawski <dan@moodle.com>
- * @license     http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ * @license     https://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
 
 defined('MOODLE_INTERNAL') || die();
@@ -31,7 +31,7 @@
  * Table listing jabber conversations
  *
  * @copyright   2012 Dan Poltawski <dan@moodle.com>
- * @license     http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ * @license     https://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
 class local_chatlogs_converations_table extends table_sql {
 
@@ -49,10 +49,10 @@ public function __construct($uniqueid) {
         $this->sql->fields = 'conversationid, messagecount, timestart, timeend, (timestart - timeend) AS duration';
         $this->sql->from = '{local_chatlogs_conversations}';
         $this->sql->where = 'messagecount > 0';
-        $this->sql->params = array();
+        $this->sql->params = [];
 
-        $this->define_columns(array('conversationid', 'participants', 'messagecount', 'timestart', 'timeend', 'duration'));
-        $this->define_headers(array('ID', 'Participants', 'Messages', 'Start', 'End', 'Duration'));
+        $this->define_columns(['conversationid', 'participants', 'messagecount', 'timestart', 'timeend', 'duration']);
+        $this->define_headers(['ID', 'Participants', 'Messages', 'Start', 'End', 'Duration']);
         $this->no_sorting('participants');
         $this->collapsible(false);
         $this->sortable(true, 'timeend', SORT_DESC);
@@ -77,7 +77,7 @@ public function col_participants($row) {
                 LEFT JOIN {user} u ON p.userid = u.id
                 WHERE m.conversationid = ?
                GROUP BY p.fromemail, p.nickname, u.firstname, u.lastname';
-        $participants = $DB->get_records_sql_menu($sql, array($row->conversationid));
+        $participants = $DB->get_records_sql_menu($sql, [$row->conversationid]);
         $participants = implode(', ', $participants);
 
         return $this->conversation_link($row->conversationid, $participants);
@@ -141,7 +141,7 @@ public function col_timeend($row) {
      * @return string HTML of link
      */
     private function conversation_link($id, $text) {
-        $url = new moodle_url('/local/chatlogs/index.php', array('conversationid' => $id));
+        $url = new moodle_url('/local/chatlogs/index.php', ['conversationid' => $id]);
 
         return html_writer::link($url, $text);
     }
@@ -152,7 +152,7 @@ private function conversation_link($id, $text) {
  * A jabber conversation
  *
  * @copyright   2012 Dan Poltawski <dan@moodle.com>
- * @license     http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ * @license     https://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
 class local_chatlogs_conversation {
     /** @var object From from the chatlogs_conversations table */
@@ -183,7 +183,7 @@ public function __construct($conversationid) {
 
         $this->urlfilter = new local_chatlogs\urlfilter();
         $this->conversation = $DB->get_record('local_chatlogs_conversations',
-            array('conversationid' => $conversationid), '*', MUST_EXIST);
+            ['conversationid' => $conversationid], '*', MUST_EXIST);
     }
 
     /**
@@ -202,13 +202,13 @@ private function get_previous_link() {
         $sql = 'SELECT * FROM {local_chatlogs_conversations}
                 WHERE  id != ? AND timeend < ? AND messagecount > 0
                 ORDER BY timeend DESC LIMIT 1';
-        $previous = $DB->get_record_sql($sql, array($this->conversation->id, $this->conversation->timeend));
+        $previous = $DB->get_record_sql($sql, [$this->conversation->id, $this->conversation->timeend]);
 
         if ($previous) {
             $url = new moodle_url('/local/chatlogs/index.php',
-                array('conversationid' => $previous->conversationid));
+                ['conversationid' => $previous->conversationid]);
             $this->previouslink = html_writer::link($url, '&#x25C4; '.$previous->messagecount.' messages',
-                array('class' => 'previouslink'));
+                ['class' => 'previouslink']);
         }
 
         return $this->previouslink;
@@ -230,12 +230,12 @@ private function get_next_link() {
         $sql = 'SELECT * FROM {local_chatlogs_conversations}
                 WHERE  id != ? AND timeend > ? AND messagecount > 0
                 ORDER BY timeend ASC LIMIT 1';
-        $next = $DB->get_record_sql($sql, array($this->conversation->id, $this->conversation->timeend));
+        $next = $DB->get_record_sql($sql, [$this->conversation->id, $this->conversation->timeend]);
 
         if ($next) {
-            $url = new moodle_url('/local/chatlogs/index.php', array('conversationid' => $next->conversationid));
+            $url = new moodle_url('/local/chatlogs/index.php', ['conversationid' => $next->conversationid]);
             $this->nextlink = html_writer::link($url, $next->messagecount.' messages &#x25BA;',
-                array('class' => 'nextlink'));
+                ['class' => 'nextlink']);
         }
 
         return $this->nextlink;
@@ -254,13 +254,13 @@ public function conversation_header() {
 
         $header = new html_table();
         $header->width = '100%';
-        $header->wrap  = array('nowrap', '', 'nowrap');
-        $header->size = array('', '100%', '');
-        $header->data[] = array(
+        $header->wrap  = ['nowrap', '', 'nowrap'];
+        $header->size = ['', '100%', ''];
+        $header->data[] = [
             $OUTPUT->heading($this->get_previous_link()),
             $OUTPUT->heading("$starttime, for $duration"),
             $OUTPUT->heading($this->get_next_link()),
-        );
+        ];
 
         return html_writer::table($header);
     }
@@ -274,15 +274,15 @@ public function conversation_footer() {
         global $OUTPUT;
 
         $footer = new html_table();
-        $footer->wrap  = array('nowrap', '', 'nowrap');
+        $footer->wrap  = ['nowrap', '', 'nowrap'];
         $footer->width = '100%';
-        $footer->size = array('', '100%', '');
-        $footer->data[] = array(
+        $footer->size = ['', '100%', ''];
+        $footer->data[] = [
             $OUTPUT->heading($this->get_previous_link()),
             $OUTPUT->heading(html_writer::link(new moodle_url('/local/chatlogs/index.php'),
                 get_string('allconversations', 'local_chatlogs'))),
             $OUTPUT->heading($this->get_next_link()),
-        );
+        ];
 
         return html_writer::table($footer);
     }
@@ -308,12 +308,12 @@ public function render() {
                 WHERE m.conversationid = :conversationid
                 ORDER BY m.timesent';
 
-        $rs = $DB->get_recordset_sql($sql, array('conversationid' => $this->conversation->conversationid));
+        $rs = $DB->get_recordset_sql($sql, ['conversationid' => $this->conversation->conversationid]);
         echo $this->conversation_header();
 
         $table = new html_table();
         $table->attributes['class'] = 'devchat';
-        $table->wrap  = array('nowrap', 'nowrap', '');
+        $table->wrap  = ['nowrap', 'nowrap', ''];
 
         foreach ($rs as $message) {
             $time = userdate($message->timesent, "%I:%M:%S %P");
@@ -326,7 +326,7 @@ public function render() {
             } else {
                 $namecell->text = $message->nickname . html_writer::empty_tag('br');
             }
-            $namecell->text .= html_writer::link('#c'.$message->messageid, $time,  array('class' => 'jabbertime'));
+            $namecell->text .= html_writer::link('#c'.$message->messageid, $time,  ['class' => 'jabbertime']);
 
             $messagecell = new html_table_cell();
             $messagecell->attributes['class'] = 'talkmessage';
@@ -339,7 +339,7 @@ public function render() {
             }
 
             // This is a bit of a hack to make the format plain, but have clickable links..
-            $formatedmessage = format_text($message->message, FORMAT_PLAIN, array('para' => false));
+            $formatedmessage = format_text($message->message, FORMAT_PLAIN, ['para' => false]);
             $this->urlfilter->convert_urls_into_links($formatedmessage);
             $messagecell->text .= $formatedmessage;
 
@@ -351,7 +351,7 @@ public function render() {
 
             $row = new html_table_row();
             $row->id = 'c'.$message->messageid;
-            $row->cells = array($imagecell, $namecell, $messagecell);
+            $row->cells = [$imagecell, $namecell, $messagecell];
             $table->data[] = $row;
         }
         $rs->close();
@@ -363,12 +363,15 @@ public function render() {
 }
 
 /**
- * Table listing jabber search results
+ * Table listing chat search results
  *
  * @copyright   2012 Dan Poltawski <dan@moodle.com>
- * @license     http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ * @license     https://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
 class local_chatlogs_search_table extends table_sql {
+    /**
+     * @var string Search term used to search the logs.
+     */
     private $searchterm = null;
 
     /**
@@ -399,10 +402,10 @@ public function __construct($uniqueid, $searchterm) {
                             LEFT JOIN {user} u ON p.userid = u.id';
 
         $this->sql->where = $DB->sql_like('m.message', ':search');
-        $this->sql->params = array('search' => '%'.$searchterm.'%');
+        $this->sql->params = ['search' => '%'.$searchterm.'%'];
 
-        $this->define_columns(array('timesent', 'userpic', 'userid', 'message'));
-        $this->define_headers(array('Timesent', '', 'User', 'Message'));
+        $this->define_columns(['timesent', 'userpic', 'userid', 'message']);
+        $this->define_headers(['Timesent', '', 'User', 'Message']);
         $this->column_class('timesent', 'userinfo');
         $this->column_class('userpic', 'userpic');
         $this->column_class('userid', 'userinfo usersays');
@@ -420,10 +423,10 @@ public function __construct($uniqueid, $searchterm) {
      */
     public function col_timesent($row) {
         $link = new moodle_url('/local/chatlogs/index.php');
-        $link->params( array('conversationid' => $row->conversationid));
+        $link->params( ['conversationid' => $row->conversationid]);
         $link->set_anchor('c'.$row->messageid);
 
-        return html_writer::link($link, userdate($row->timesent),  array('class' => 'jabbertime'));
+        return html_writer::link($link, userdate($row->timesent),  ['class' => 'jabbertime']);
     }
 
     /**
@@ -469,7 +472,7 @@ public function col_message($row) {
             $row->message = substr(trim($row->message), 4);
         }
 
-        $message = format_text($row->message, FORMAT_MOODLE, array('para' => false));
+        $message = format_text($row->message, FORMAT_MOODLE, ['para' => false]);
         $text .= highlight($this->searchterm, $message);
 
         return $text;
@@ -486,11 +489,11 @@ public static function form($searchtext = '') {
 
         $url = new moodle_url('/local/chatlogs/index.php');
 
-        $o .= html_writer::start_tag('div', array('class' => 'searchform'));
-        $o .= html_writer::start_tag('form', array('method' => 'get', 'action' => $url->out()));
-        $o .= html_writer::empty_tag('input', array('type' => 'text', 'name' => 'q',
-             'value' => $searchtext, 'maxlength' => 100, 'size' => 20));
-        $o .= html_writer::empty_tag('input', array('type' => 'submit', 'value' => get_string('searchmessages', 'local_chatlogs')));
+        $o .= html_writer::start_tag('div', ['class' => 'searchform']);
+        $o .= html_writer::start_tag('form', ['method' => 'get', 'action' => $url->out()]);
+        $o .= html_writer::empty_tag('input', ['type' => 'text', 'name' => 'q',
+             'value' => $searchtext, 'maxlength' => 100, 'size' => 20]);
+        $o .= html_writer::empty_tag('input', ['type' => 'submit', 'value' => get_string('searchmessages', 'local_chatlogs')]);
         $o .= html_writer::end_tag('form');
         $o .= html_writer::end_tag('div');
 
@@ -506,7 +509,7 @@ public static function form($searchtext = '') {
  */
 function  local_chatlogs_require_capability() {
     if (!local_chatlogs_can_access()) {
-        print_error('nopermissions', 'error', '',  get_string('viewchatlogs', 'local_chatlogs'));
+        throw new moodle_exception('nopermissions', 'error', '',  get_string('viewchatlogs', 'local_chatlogs'));
         die;
     }
 }
diff --git a/settings.php b/settings.php
index 9323687..281a6e2 100644
--- a/settings.php
+++ b/settings.php
@@ -1,5 +1,5 @@
 <?php
-// This file is part of Moodle - http://moodle.org/
+// This file is part of Moodle - https://moodle.org/
 //
 // Moodle is free software: you can redistribute it and/or modify
 // it under the terms of the GNU General Public License as published by
@@ -12,14 +12,14 @@
 // GNU General Public License for more details.
 //
 // You should have received a copy of the GNU General Public License
-// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+// along with Moodle.  If not, see <https://www.gnu.org/licenses/>.
 
 /**
  * Settings for local_chatlogs plugin
  *
  * @package     local_chatlogs
  * @copyright   2012 Dan Poltawski <dan@moodle.com>
- * @license     http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ * @license     https://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
 
 
diff --git a/syncchatlogs.php b/syncchatlogs.php
index 2ec115c..9945204 100644
--- a/syncchatlogs.php
+++ b/syncchatlogs.php
@@ -1,5 +1,5 @@
 <?php
-// This file is part of Moodle - http://moodle.org/
+// This file is part of Moodle - https://moodle.org/
 //
 // Moodle is free software: you can redistribute it and/or modify
 // it under the terms of the GNU General Public License as published by
@@ -12,7 +12,15 @@
 // GNU General Public License for more details.
 //
 // You should have received a copy of the GNU General Public License
-// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+// along with Moodle.  If not, see <https://www.gnu.org/licenses/>.
+
+/**
+ * CLI script to perform the fetch all the new chat logs to the plugin
+ *
+ * @package     local_chatlogs
+ * @copyright   2012 Dan Poltawski <dan@moodle.com>
+ * @license     https://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
 
 define('CLI_SCRIPT', true);
 require(__DIR__.'/../../config.php');
@@ -20,7 +28,7 @@
 // Only php cli allowed.
 if (isset($_SERVER['REMOTE_ADDR'])) {
     if ($_SERVER['REMOTE_ADDR'] != "174.123.154.58") {
-        print_error('cronerrorclionly', 'admin');
+        throw new moodle_exception('cronerrorclionly', 'admin');
         exit;
     } else {
         $ismoodlebot = true;
@@ -87,7 +95,7 @@
             $message->conversationid = $lastmessage->conversationid;   // Same.
 
             $conversation = $DB->get_record('local_chatlogs_conversations',
-                array('conversationid' => $message->conversationid), '*', MUST_EXIST);
+                ['conversationid' => $message->conversationid], '*', MUST_EXIST);
             $conversation->timeend = $message->timesent;
             $conversation->messagecount = $conversation->messagecount + 1;
             if (!$DB->update_record('local_chatlogs_conversations', $conversation)) {
@@ -120,7 +128,7 @@
         // Now check that they have a registered name and if not, register them.
 
         if (empty($currentparticipant[$message->fromemail])) {
-            if (!$participant = $DB->get_record('local_chatlogs_participants', array('fromemail' => $message->fromemail))) {
+            if (!$participant = $DB->get_record('local_chatlogs_participants', ['fromemail' => $message->fromemail])) {
                 $participant = new object;
                 $participant->fromemail = $message->fromemail;
                 $participant->nickname = $message->fromnick;
@@ -140,7 +148,7 @@
 } else {
     $conversationid = $DB->get_field_sql(
         "SELECT conversationid FROM {local_chatlogs_conversations} ORDER BY conversationid desc LIMIT 1");
-    echo "Synchronised chat logs ($count new messages) - URL: http://moodle.org/local/chatlogs/index.php?conversationid=" .
+    echo "Synchronised chat logs ($count new messages) - URL: https://moodle.org/local/chatlogs/index.php?conversationid=" .
         $conversationid."\n";
 }
 
@@ -156,10 +164,10 @@
         if ($pushtonext) {  // Copy those to this.
             $DB->execute(
                 "UPDATE {local_chatlogs_messages} SET conversationid = $conversation->conversationid WHERE conversationid = ?",
-                array($pushtonext));
+                [$pushtonext]);
             $DB->execute(
                 "UPDATE {local_chatlogs_conversations} SET messagecount = 0 WHERE conversationid = ?",
-                array($pushtonext));
+                [$pushtonext]);
             $pushtonext = 0;
         }
 
diff --git a/tests/telegram_importer_test.php b/tests/telegram_importer_test.php
index 82c82c1..6caa29c 100644
--- a/tests/telegram_importer_test.php
+++ b/tests/telegram_importer_test.php
@@ -1,5 +1,5 @@
 <?php
-// This file is part of Moodle - http://moodle.org/
+// This file is part of Moodle - https://moodle.org/
 //
 // Moodle is free software: you can redistribute it and/or modify
 // it under the terms of the GNU General Public License as published by
@@ -12,7 +12,17 @@
 // GNU General Public License for more details.
 //
 // You should have received a copy of the GNU General Public License
-// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+// along with Moodle.  If not, see <https://www.gnu.org/licenses/>.
+
+/**
+ * Telegram importer tests.
+ *
+ * @package local_chatlogs
+ * @copyright 2017 Dan Poltawski
+ * @license https://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+
+namespace local_chatlogs;
 
 defined('MOODLE_INTERNAL') || die();
 
@@ -23,11 +33,12 @@
  *
  * @package local_chatlogs
  * @copyright 2017 Dan Poltawski
- * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ * @license https://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ * @covers \local_chatlogs_testable_telegram_importer
  */
-class local_chatlogs_telegram_importer_test extends advanced_testcase {
+final class telegram_importer_test extends \advanced_testcase {
 
-    public function test_import_when_empty() {
+    public function test_import_when_empty(): void {
         $this->resetAfterTest();
 
         $importer = new local_chatlogs_testable_telegram_importer();
@@ -36,16 +47,16 @@ public function test_import_when_empty() {
         $this->assertEmpty($importedcount);
     }
 
-    public function test_import_fails_on_bad_json() {
+    public function test_import_fails_on_bad_json(): void {
         $this->resetAfterTest();
         $importer = new local_chatlogs_testable_telegram_importer();
         $importer->set_mock_response('{sdfs:sdf');
 
-        $this->expectException(moodle_exception::class);
+        $this->expectException(\moodle_exception::class);
         $importer->import();
     }
 
-    public function test_import() {
+    public function test_import(): void {
         global $DB;
         $this->resetAfterTest();
 
@@ -109,7 +120,7 @@ public function test_import() {
         $this->assertSame(2, $DB->count_records('local_chatlogs_conversations'));
     }
 
-    public function test_import_with_existing_data() {
+    public function test_import_with_existing_data(): void {
         global $DB;
         $this->resetAfterTest();
         // Insert some chatlog data.
@@ -157,7 +168,7 @@ public function test_import_with_existing_data() {
         $this->assertSame(2, $DB->count_records('local_chatlogs_participants'));
     }
 
-    public function test_problematic_mysql_emojis() {
+    public function test_problematic_mysql_emojis(): void {
         global $DB;
         $this->resetAfterTest();
 
@@ -180,9 +191,9 @@ public function test_problematic_mysql_emojis() {
  * Testable importer which generates mock server response.
  * @package local_chatlogs
  * @copyright 2017 Dan Poltawski
- * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ * @license https://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
-class local_chatlogs_testable_telegram_importer extends local_chatlogs\telegram_importer {
+class local_chatlogs_testable_telegram_importer extends telegram_importer {
     /** @var string|array mock response */
     private $mockresponse = null;
 
@@ -206,9 +217,9 @@ protected function call_api(\moodle_url $url) {
 
         // Simulate server-side filtering of timestamp.
         if ($timestamp = $url->param('aftertimestamp')) {
-            $afterdate = new DateTime($timestamp);
+            $afterdate = new \DateTime($timestamp);
             $resp = array_filter($this->mockresponse, function ($row) use($afterdate) {
-                return new DateTime($row->timestamp) > $afterdate;
+                return new \DateTime($row->timestamp) > $afterdate;
             });
             return json_encode(array_values($resp));
         }
diff --git a/version.php b/version.php
index 5a9932b..4428b75 100644
--- a/version.php
+++ b/version.php
@@ -1,5 +1,5 @@
 <?php
-// This file is part of Moodle - http://moodle.org/
+// This file is part of Moodle - https://moodle.org/
 //
 // Moodle is free software: you can redistribute it and/or modify
 // it under the terms of the GNU General Public License as published by
@@ -12,14 +12,14 @@
 // GNU General Public License for more details.
 //
 // You should have received a copy of the GNU General Public License
-// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+// along with Moodle.  If not, see <https://www.gnu.org/licenses/>.
 
 /**
  * Version details.
  *
  * @package    local_chatlogs
  * @copyright  Dan Poltawski
- * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ * @license    https://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
 
 defined('MOODLE_INTERNAL') || die;
@@ -29,6 +29,6 @@
 $plugin->version = 2021051000;
 $plugin->requires = 2021050700;
 $plugin->maturity = MATURITY_STABLE;
-$plugin->dependencies = array(
+$plugin->dependencies = [
     'filter_urltolink' => ANY_VERSION,
-);
+];
diff --git a/yui/jabberaliases/jabberaliases.js b/yui/jabberaliases/jabberaliases.js
index 354c46c..5e0e562 100644
--- a/yui/jabberaliases/jabberaliases.js
+++ b/yui/jabberaliases/jabberaliases.js
@@ -3,7 +3,7 @@
  * Shamelessly stolen from the dev plugin by Dan
  *
  * @author  David Mudrak <david@moodle.com>
- * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ * @license https://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
 YUI.add('moodle-local_chatlogs-jabberaliases', function(Y) {
 
diff --git a/yui/keyboard/keyboard.js b/yui/keyboard/keyboard.js
index 89d5656..d83fd99 100644
--- a/yui/keyboard/keyboard.js
+++ b/yui/keyboard/keyboard.js
@@ -3,7 +3,7 @@
  * between chats.
  *
  * @author  Dan Poltawski <dan@moodle.com>
- * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ * @license https://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
 YUI.add('moodle-local_chatlogs-keyboard', function(Y) {