diff --git a/admin/webservice/tokens.php b/admin/webservice/tokens.php
index 5f4e0875df2..cd9903c5f35 100644
--- a/admin/webservice/tokens.php
+++ b/admin/webservice/tokens.php
@@ -168,7 +168,6 @@ foreach ($filterdata->services as $i => $serviceid) {
 $table->define_baseurl($baseurl);
 
 $table->attributes['class'] = 'admintable generaltable';
-$table->data = [];
 $table->out(30, false);
 
 echo $OUTPUT->footer();
diff --git a/auth/email/tests/external/external_test.php b/auth/email/tests/external/external_test.php
index e69e90e585b..79cd4226fff 100644
--- a/auth/email/tests/external/external_test.php
+++ b/auth/email/tests/external/external_test.php
@@ -45,6 +45,12 @@ require_once($CFG->dirroot . '/webservice/tests/helpers.php');
  */
 class external_test extends externallib_advanced_testcase {
 
+    /** @var int custom profile field1 ID. */
+    protected $field1;
+
+    /** @var int custom profile field2 ID. */
+    protected $field2;
+
     /**
      * Set up for every test
      */
diff --git a/auth/ldap/auth.php b/auth/ldap/auth.php
index 567d00c6f29..eff6fe2d913 100644
--- a/auth/ldap/auth.php
+++ b/auth/ldap/auth.php
@@ -86,6 +86,18 @@ require_once($CFG->dirroot.'/auth/ldap/locallib.php');
  */
 class auth_plugin_ldap extends auth_plugin_base {
 
+    /** @var string */
+    protected $roleauth;
+
+    /** @var string */
+    public $pluginconfig;
+
+    /** @var LDAP\Connection LDAP connection. */
+    protected $ldapconnection;
+
+    /** @var int */
+    protected $ldapconns = 0;
+
     /**
      * Init plugin config from database settings depending on the plugin auth type.
      */
diff --git a/auth/mnet/auth.php b/auth/mnet/auth.php
index ade0cc3b88a..f86b3b4495b 100644
--- a/auth/mnet/auth.php
+++ b/auth/mnet/auth.php
@@ -32,6 +32,9 @@ require_once($CFG->libdir.'/authlib.php');
  */
 class auth_plugin_mnet extends auth_plugin_base {
 
+    /** @var mnet_environment mnet environment. */
+    protected $mnet;
+
     /**
      * Constructor.
      */
diff --git a/availability/condition/completion/classes/frontend.php b/availability/condition/completion/classes/frontend.php
index c6466854874..b2c36e5078e 100644
--- a/availability/condition/completion/classes/frontend.php
+++ b/availability/condition/completion/classes/frontend.php
@@ -37,7 +37,7 @@ class frontend extends \core_availability\frontend {
     /**
      * @var array Cached init parameters
      */
-    protected $cacheparams = [];
+    protected $cacheinitparams = [];
 
     /**
      * @var string IDs of course, cm, and section for cache (if any)
diff --git a/badges/classes/backpack_api2p1.php b/badges/classes/backpack_api2p1.php
index f3829089252..c5fec6f4128 100644
--- a/badges/classes/backpack_api2p1.php
+++ b/badges/classes/backpack_api2p1.php
@@ -81,7 +81,7 @@ class backpack_api2p1 {
         if (!empty($externalbackpack)) {
             $this->externalbackpack = $externalbackpack;
             $this->backpackapiversion = $externalbackpack->apiversion;
-            $this->get_clientid = $this->get_clientid($externalbackpack->oauth2_issuerid);
+            $this->get_clientid($externalbackpack->oauth2_issuerid);
 
             if (!($this->tokendata = $this->get_stored_token($externalbackpack->id))
                 && $this->backpackapiversion != OPEN_BADGES_V2P1) {
diff --git a/badges/classes/backpack_api2p1_mapping.php b/badges/classes/backpack_api2p1_mapping.php
index 7419f3b65e2..f2a5a4f2194 100644
--- a/badges/classes/backpack_api2p1_mapping.php
+++ b/badges/classes/backpack_api2p1_mapping.php
@@ -67,6 +67,12 @@ class backpack_api2p1_mapping {
     /** @var boolean Differentiate the function that can be called on a user backpack or a site backpack. */
     private $isuserbackpack;
 
+    /** @var mixed List of parameters for this method. */
+    protected $postparams;
+
+    /** @var int OpenBadges version 1 or 2. */
+    protected $backpackapiversion;
+
     /**
      * Create a mapping.
      *
diff --git a/badges/classes/backpack_api_mapping.php b/badges/classes/backpack_api_mapping.php
index 4c10f672a77..36ec0bc2e28 100644
--- a/badges/classes/backpack_api_mapping.php
+++ b/badges/classes/backpack_api_mapping.php
@@ -79,6 +79,12 @@ class backpack_api_mapping {
     /** @var string Error string from authentication request. */
     private static $authenticationerror = '';
 
+    /** @var mixed List of parameters for this method. */
+    protected $postparams;
+
+    /** @var int OpenBadges version 1 or 2. */
+    protected $backpackapiversion;
+
     /**
      * Create a mapping.
      *
diff --git a/badges/classes/badge.php b/badges/classes/badge.php
index 284556154db..93ee6d32a03 100644
--- a/badges/classes/badge.php
+++ b/badges/classes/badge.php
@@ -129,6 +129,24 @@ class badge {
     /** @var array Badge criteria */
     public $criteria = array();
 
+    /** @var int|null Total users which have the award. Called from badges_get_badges() */
+    public $awards;
+
+    /** @var string|null The name of badge status. Called from badges_get_badges() */
+    public $statstring;
+
+    /** @var int|null The date the badges were issued. Called from badges_get_badges() */
+    public $dateissued;
+
+    /** @var string|null Unique hash. Called from badges_get_badges() */
+    public $uniquehash;
+
+    /** @var string|null Message format. Called from file_prepare_standard_editor() */
+    public $messageformat;
+
+    /** @var array Message editor. Called from file_prepare_standard_editor() */
+    public $message_editor = [];
+
     /**
      * Constructs with badge details.
      *
@@ -240,7 +258,16 @@ class badge {
         foreach (get_object_vars($this) as $k => $v) {
             $fordb->{$k} = $v;
         }
+        // TODO: We need to making it more simple.
+        // Since the variables are not exist in the badge table,
+        // unsetting them is a must to avoid errors.
         unset($fordb->criteria);
+        unset($fordb->awards);
+        unset($fordb->statstring);
+        unset($fordb->dateissued);
+        unset($fordb->uniquehash);
+        unset($fordb->messageformat);
+        unset($fordb->message_editor);
 
         $fordb->timemodified = time();
         if ($DB->update_record_raw('badge', $fordb)) {
diff --git a/badges/classes/output/external_backpacks_page.php b/badges/classes/output/external_backpacks_page.php
index 195658ce6c6..e1f309d6a63 100644
--- a/badges/classes/output/external_backpacks_page.php
+++ b/badges/classes/output/external_backpacks_page.php
@@ -39,6 +39,12 @@ use core_badges\external\backpack_exporter;
  */
 class external_backpacks_page implements \renderable {
 
+    /** @var \moodle_url Badges backpacks URL. */
+    protected $url;
+
+    /** @var array List the backpacks at site level. */
+    protected $backpacks = [];
+
     /**
      * Constructor.
      * @param \moodle_url $url
diff --git a/badges/classes/output/external_backpacks_table.php b/badges/classes/output/external_backpacks_table.php
index 72393f18da9..46a54c6f553 100644
--- a/badges/classes/output/external_backpacks_table.php
+++ b/badges/classes/output/external_backpacks_table.php
@@ -48,9 +48,9 @@ class external_backpacks_table extends table_sql {
     public function __construct() {
         parent::__construct('backpacks');
 
-        $this->context = \context_system::instance();
+        $context = \context_system::instance();
         // This object should not be used without the right permissions.
-        require_capability('moodle/badges:manageglobalsettings', $this->context);
+        require_capability('moodle/badges:manageglobalsettings', $context);
 
         // Define columns in the table.
         $this->define_table_columns();
diff --git a/badges/criteria/award_criteria.php b/badges/criteria/award_criteria.php
index b568df3257e..ef55ade8c9f 100644
--- a/badges/criteria/award_criteria.php
+++ b/badges/criteria/award_criteria.php
@@ -128,6 +128,24 @@ abstract class award_criteria {
      */
     public $params = array();
 
+    /**
+     * Criteria type.
+     * @var string
+     */
+    public $criteriatype;
+
+    /**
+     * Required parameters.
+     * @var string
+     */
+    public $required_param = '';
+
+    /**
+     * Optional parameters.
+     * @var array
+     */
+    public $optional_params = [];
+
     /**
      * The base constructor
      *
diff --git a/blocks/glossary_random/block_glossary_random.php b/blocks/glossary_random/block_glossary_random.php
index 4b1e1493dc5..0982014a5fd 100644
--- a/blocks/glossary_random/block_glossary_random.php
+++ b/blocks/glossary_random/block_glossary_random.php
@@ -35,6 +35,9 @@ class block_glossary_random extends block_base {
      */
     protected $glossarycm = null;
 
+    /** @var stdClass course data. */
+    public $course;
+
     function init() {
         $this->title = get_string('pluginname','block_glossary_random');
     }
diff --git a/blocks/moodleblock.class.php b/blocks/moodleblock.class.php
index 8ae2c1eff7e..33e788b935b 100644
--- a/blocks/moodleblock.class.php
+++ b/blocks/moodleblock.class.php
@@ -855,9 +855,6 @@ class block_tree extends block_list {
         $this->get_required_javascript();
         $this->get_content();
         $content = $output->tree_block_contents($this->content->items,array('class'=>'block_tree list'));
-        if (isset($this->id) && !is_numeric($this->id)) {
-            $content = $output->box($content, 'block_tree_box', $this->id);
-        }
         return $content;
     }
 }
diff --git a/blocks/myoverview/classes/output/main.php b/blocks/myoverview/classes/output/main.php
index f8226c276b7..90b42c1752b 100644
--- a/blocks/myoverview/classes/output/main.php
+++ b/blocks/myoverview/classes/output/main.php
@@ -152,6 +152,9 @@ class main implements renderable, templatable {
      */
     private $customfieldvalue;
 
+    /** @var bool true if grouping selector should be shown, otherwise false. */
+    protected $displaygroupingselector;
+
     /**
      * main constructor.
      * Initialize the user preferences
diff --git a/blocks/recentlyaccesseditems/tests/observer_test.php b/blocks/recentlyaccesseditems/tests/observer_test.php
index 6b1b30e56dd..774cb86d972 100644
--- a/blocks/recentlyaccesseditems/tests/observer_test.php
+++ b/blocks/recentlyaccesseditems/tests/observer_test.php
@@ -32,6 +32,33 @@ require_once($CFG->dirroot . '/mod/assign/tests/generator.php');
 class observer_test extends \advanced_testcase {
     use \mod_assign_test_generator;
 
+    /** @var string Table name. */
+    protected $table;
+
+    /** @var \stdClass course data. */
+    protected $course;
+
+    /** @var \stdClass student data. */
+    protected $student;
+
+    /** @var \stdClass teacher data. */
+    protected $teacher;
+
+    /** @var \stdClass student role. */
+    protected $studentrole;
+
+    /** @var \stdClass teacher role. */
+    protected $teacherrole;
+
+    /** @var \stdClass course forum. */
+    protected $forum;
+
+    /** @var \stdClass course glossary. */
+    protected $glossary;
+
+    /** @var \stdClass course chat. */
+    protected $chat;
+
     /**
      * Set up for every test
      */
diff --git a/blog/locallib.php b/blog/locallib.php
index f2b3f2293f6..979b17ceeed 100644
--- a/blog/locallib.php
+++ b/blog/locallib.php
@@ -68,6 +68,69 @@ class blog_entry implements renderable {
     /** @var StdClass Data needed to render the entry */
     public $renderable;
 
+    /** @var string summary format. */
+    public string $summaryformat;
+
+    /** @var array summary editor. */
+    public array $summary_editor;
+
+    /** @var string */
+    public $summarytrust;
+
+    /** @var int course associated with the blog post. */
+    public $courseassoc;
+
+    /** @var string module associated with the blog post. */
+    public $modassoc;
+
+    /** @var mixed attachment. */
+    public $attachment_filemanager;
+
+    /** @var string blog post body. */
+    public $body;
+
+    /** @var int attachment entry id. */
+    public $entryid;
+
+    /** @var string|null submit button. */
+    public $submitbutton;
+
+    /** @var string|null user alias. */
+    public $useridalias;
+
+    /** @var string|null user picture. */
+    public $picture;
+
+    /** @var string|null user first name. */
+    public $firstname;
+
+    /** @var string|null user middle name. */
+    public $middlename;
+
+    /** @var string|null user last name. */
+    public $lastname;
+
+    /** @var string|null user first name phonetic. */
+    public $firstnamephonetic;
+
+    /** @var string|null user last name phonetic. */
+    public $lastnamephonetic;
+
+    /** @var string|null user alternate name. */
+    public $alternatename;
+
+    /** @var string|null user email address. */
+    public $email;
+
+    /** @var string */
+    public $action;
+
+    /** @var string|null user picture description. */
+    public $imagealt;
+
+    /** @var int module instance id. */
+    public $modid;
+
     /**
      * Constructor. If given an id, will fetch the corresponding record from the DB.
      *
diff --git a/blog/tests/external/external_test.php b/blog/tests/external/external_test.php
index c51ec1436a4..c1dc8f13b46 100644
--- a/blog/tests/external/external_test.php
+++ b/blog/tests/external/external_test.php
@@ -48,6 +48,9 @@ class external_test extends \advanced_testcase {
     private $tagid;
     private $postid;
 
+    /** @var string publish state. */
+    protected $publishstate;
+
     protected function setUp(): void {
         global $DB, $CFG;
         parent::setUp();
diff --git a/cache/classes/config.php b/cache/classes/config.php
index 021e2a69dd9..115b5ef3869 100644
--- a/cache/classes/config.php
+++ b/cache/classes/config.php
@@ -65,6 +65,12 @@ class cache_config {
      */
     protected $configdefinitionmappings = array();
 
+    /**
+     * The locking mappings that have been configured.
+     * @var array
+     */
+    protected $configlockmappings = [];
+
     /**
      * An array of configured cache lock instances.
      * @var array
diff --git a/cache/classes/dummystore.php b/cache/classes/dummystore.php
index bcc9ca1e72f..f268cef50c9 100644
--- a/cache/classes/dummystore.php
+++ b/cache/classes/dummystore.php
@@ -59,6 +59,12 @@ class cachestore_dummy extends cache_store {
      */
     protected $store = array();
 
+    /**
+     * Cache definition
+     * @var cache_definition
+     */
+    protected $definition;
+
     /**
      * Constructs a dummy store instance.
      * @param string $name
@@ -119,6 +125,8 @@ class cachestore_dummy extends cache_store {
         } else {
             $this->persist = !$definition->use_static_acceleration();
         }
+
+        $this->definition = $definition;
     }
 
     /**
diff --git a/cache/classes/loaders.php b/cache/classes/loaders.php
index b008ae1079b..8f32d6560da 100644
--- a/cache/classes/loaders.php
+++ b/cache/classes/loaders.php
@@ -173,6 +173,19 @@ class cache implements cache_loader {
      */
     protected $subloader = false;
 
+    /**
+     * Gets set to true if the cache writes (set|delete) must have a manual lock created first.
+     * @var bool
+     */
+    protected $requirelockingbeforewrite = false;
+
+    /**
+     * Gets set to true if the cache's primary store natively supports locking.
+     * If it does then we use that, otherwise we need to instantiate a second store to use for locking.
+     * @var cache_store|null
+     */
+    protected $nativelocking = null;
+
     /**
      * Creates a new cache instance for a pre-defined definition.
      *
diff --git a/calendar/lib.php b/calendar/lib.php
index 41de255e92d..14f2c7941c0 100644
--- a/calendar/lib.php
+++ b/calendar/lib.php
@@ -1066,6 +1066,18 @@ class calendar_information {
     /** @var string The calendar's view mode. */
     protected $viewmode;
 
+    /** @var \stdClass course data. */
+    public $course;
+
+    /** @var int day. */
+    protected $day;
+
+    /** @var int month. */
+    protected $month;
+
+    /** @var int year. */
+    protected $year;
+
     /**
      * Creates a new instance
      *
diff --git a/calendar/tests/event_factory_test.php b/calendar/tests/event_factory_test.php
index 044341ec99a..52ef17fa40c 100644
--- a/calendar/tests/event_factory_test.php
+++ b/calendar/tests/event_factory_test.php
@@ -75,7 +75,10 @@ class event_factory_test extends \advanced_testcase {
         }
 
         if ($expectedattributevalue) {
-            $this->assertEquals($instance->testattribute, $expectedattributevalue);
+            $this->assertEquals(
+                $instance->get_description()->get_value(),
+                $expectedattributevalue
+            );
         }
     }
 
@@ -368,7 +371,6 @@ class event_factory_test extends \advanced_testcase {
                     'location' => 'Test location',
                 ],
                 'actioncallbackapplier' => function(event_interface $event) {
-                    $event->testattribute = 'Hello';
                     return $event;
                 },
                 'visibilitycallbackapplier' => function(event_interface $event) {
@@ -403,7 +405,6 @@ class event_factory_test extends \advanced_testcase {
                     'location' => 'Test location',
                 ],
                 'actioncallbackapplier' => function(event_interface $event) {
-                    $event->testattribute = 'Hello';
                     return $event;
                 },
                 'visibilitycallbackapplier' => function(event_interface $event) {
@@ -438,7 +439,6 @@ class event_factory_test extends \advanced_testcase {
                     'location' => 'Test location',
                 ],
                 'actioncallbackapplier' => function(event_interface $event) {
-                    $event->testattribute = 'Hello';
                     return $event;
                 },
                 'visibilitycallbackapplier' => function(event_interface $event) {
diff --git a/comment/lib.php b/comment/lib.php
index b1074f31b21..7c3c8853c1f 100644
--- a/comment/lib.php
+++ b/comment/lib.php
@@ -96,6 +96,8 @@ class comment {
     private static $comment_page = null;
     /** @var string comment itemid component in non-javascript UI */
     private static $comment_component = null;
+    /** @var stdClass comment paramaters for callback. */
+    protected $comment_param;
 
     /**
      * Construct function of comment class, initialise
diff --git a/comment/locallib.php b/comment/locallib.php
index 3e771cca166..d3b0004162b 100644
--- a/comment/locallib.php
+++ b/comment/locallib.php
@@ -27,6 +27,24 @@ class comment_manager {
     /** @var int The number of comments to display per page */
     private $perpage;
 
+    /** @var stdClass Course data. */
+    protected $course;
+
+    /** @var context|bool To store the context object or false if not found. */
+    protected $context;
+
+    /** @var stdClass Course module. */
+    protected $cm;
+
+    /** @var course_modinfo Module information for course, or null if resetting. */
+    protected $modinfo;
+
+    /** @var string plugin type. */
+    protected $plugintype;
+
+    /** @var string plugin name. */
+    protected $pluginname;
+
     /**
      * Constructs the comment_manage object
      */
diff --git a/competency/classes/competency.php b/competency/classes/competency.php
index 5942a623369..5df830220b9 100644
--- a/competency/classes/competency.php
+++ b/competency/classes/competency.php
@@ -53,6 +53,9 @@ class competency extends persistent {
     /** @var competency Object before update. */
     protected $beforeupdate = null;
 
+    /** @var competency|null To store new parent. */
+    protected $newparent;
+
     /**
      * Return the definition of the properties of this model.
      *
diff --git a/competency/tests/competency_override_test.php b/competency/tests/competency_override_test.php
index d0e4fb48b78..d4296d0d3b8 100644
--- a/competency/tests/competency_override_test.php
+++ b/competency/tests/competency_override_test.php
@@ -25,6 +25,36 @@ namespace core_competency;
  */
 class competency_override_test extends \advanced_testcase {
 
+    /** @var \stdClass course record. */
+    protected $course;
+
+    /** @var \stdClass user record. */
+    protected $user;
+
+    /** @var \stdClass block instance record. */
+    protected $scale;
+
+    /** @var competency_framework loading competency frameworks from the DB. */
+    protected $framework;
+
+    /** @var plan loading competency plans from the DB. */
+    protected $plan;
+
+    /** @var competency loading competency from the DB. */
+    protected $comp1;
+
+    /** @var competency loading competency from the DB. */
+    protected $comp2;
+
+    /** @var \stdClass course module. */
+    protected $cm;
+
+    /** @var \completion_info completion information. */
+    protected $completion;
+
+    /** @var \context_course context course. */
+    protected $context;
+
     public function setUp(): void {
         $this->resetAfterTest(true);
         $this->setAdminUser();
diff --git a/competency/tests/external/external_test.php b/competency/tests/external/external_test.php
index cf43e0ecdf9..04ad174dc1f 100644
--- a/competency/tests/external/external_test.php
+++ b/competency/tests/external/external_test.php
@@ -94,8 +94,11 @@ class external_test extends externallib_advanced_testcase {
     /** @var string catscaleconfiguration */
     protected $scaleconfiguration3 = null;
 
-    /** @var string catscaleconfiguration */
-    protected $catscaleconfiguration4 = null;
+    /** @var string category scale configuration. */
+    protected $scaleconfiguration4 = null;
+
+    /** @var \core_course_category course category record. */
+    protected $othercategory = null;
 
     /**
      * Setup function- we will create a course and add an assign instance to it.
diff --git a/completion/completion_completion.php b/completion/completion_completion.php
index d1dc22b7670..54adf228420 100644
--- a/completion/completion_completion.php
+++ b/completion/completion_completion.php
@@ -66,6 +66,8 @@ class completion_completion extends data_object {
     /* @var int Flag to trigger cron aggregation (timestamp) */
     public $reaggregate;
 
+    /** @var float user's course grade. */
+    public $gradefinal;
 
     /**
      * Finds and returns a data_object instance based on params.
diff --git a/completion/criteria/completion_criteria.php b/completion/criteria/completion_criteria.php
index 16443835b29..5b634e89d3b 100644
--- a/completion/criteria/completion_criteria.php
+++ b/completion/criteria/completion_criteria.php
@@ -152,6 +152,12 @@ abstract class completion_criteria extends data_object {
     /* @var int Role ID that has the ability to mark a user as complete (for role completion) */
     public $role;
 
+    /** @var string course instance. */
+    public $courseinstance;
+
+    /** @var mixed time end. */
+    public $timeend;
+
     /**
      * Finds and returns all data_object instances based on params.
      *
diff --git a/completion/data_object.php b/completion/data_object.php
index 515fef7a008..730ae53010e 100644
--- a/completion/data_object.php
+++ b/completion/data_object.php
@@ -64,6 +64,9 @@ abstract class data_object {
     /* @var int The primary key */
     public $id;
 
+    /** @var int completed status. */
+    public $completedself;
+
 
     /**
      * Constructor. Optionally (and by default) attempts to fetch corresponding row from DB.
diff --git a/course/format/classes/output/local/content/section.php b/course/format/classes/output/local/content/section.php
index dcac5d6b982..29402de5394 100644
--- a/course/format/classes/output/local/content/section.php
+++ b/course/format/classes/output/local/content/section.php
@@ -79,6 +79,8 @@ class section implements named_templatable, renderable {
     /** @var bool if the section is considered stealth */
     protected $isstealth = false;
 
+    /** @var string control menu class. */
+    protected $controlmenuclass;
 
     /**
      * Constructor.
diff --git a/enrol/ldap/lib.php b/enrol/ldap/lib.php
index df57f2ae327..947af72c6e8 100644
--- a/enrol/ldap/lib.php
+++ b/enrol/ldap/lib.php
@@ -40,6 +40,9 @@ class enrol_ldap_plugin extends enrol_plugin {
      */
     protected $userobjectclass;
 
+    /** @var LDAP\Connection LDAP connection. */
+    protected $ldapconnection;
+
     /**
      * Constructor for the plugin. In addition to calling the parent
      * constructor, we define and 'fix' some settings depending on the
diff --git a/enrol/ldap/settingslib.php b/enrol/ldap/settingslib.php
index ce372c90bda..1327f286293 100644
--- a/enrol/ldap/settingslib.php
+++ b/enrol/ldap/settingslib.php
@@ -29,6 +29,9 @@ class admin_setting_configtext_trim_lower extends admin_setting_configtext {
     /* @var boolean whether to lowercase the value or not before writing in to the db */
     private $lowercase;
 
+    /**  @var bool To store enable/disabled status of the input field. */
+    protected $enabled;
+
     /**
      * Constructor: uses parent::__construct
      *
diff --git a/enrol/lti/ims-blti/OAuth.php b/enrol/lti/ims-blti/OAuth.php
index abfe8434a59..5ff5e89308b 100644
--- a/enrol/lti/ims-blti/OAuth.php
+++ b/enrol/lti/ims-blti/OAuth.php
@@ -13,6 +13,9 @@ class OAuthConsumer {
   public $key;
   public $secret;
 
+  /**  @var string|null To store callback_url. */
+  protected $callback_url;
+
   function __construct($key, $secret, $callback_url=NULL) {
     $this->key = $key;
     $this->secret = $secret;
diff --git a/enrol/lti/ims-blti/readme_moodle.txt b/enrol/lti/ims-blti/readme_moodle.txt
index fcd298b6d3b..c62a949148d 100644
--- a/enrol/lti/ims-blti/readme_moodle.txt
+++ b/enrol/lti/ims-blti/readme_moodle.txt
@@ -7,3 +7,4 @@ In future releases we should look into using a supported library.
 2022-01-20 - MDL-73523 - Conditional openssl_free_key() use, deprecated by PHP 8.0
 2022-03-05 - MDL-73520 - replace deprecated php_errormsg with error_get_last(), deprecated by PHP 8.0
 2023-05-03 - MDL-77840 - Throw exception on openssl_sign to avoid null reaching base64_encode, deprecated by PHP 8.1
+2023-05-17 - MDL-77350 - Added $callback_url property to class OAuthConsumer to comply with PHP 8.2
diff --git a/enrol/renderer.php b/enrol/renderer.php
index 8b24daca2c9..b5423ae8b9e 100644
--- a/enrol/renderer.php
+++ b/enrol/renderer.php
@@ -351,6 +351,9 @@ class course_enrolment_table extends html_table implements renderable {
             'alternatename', 'username', 'idnumber', 'email', 'phone1', 'phone2',
             'institution', 'department', 'lastaccess', 'lastcourseaccess');
 
+    /** @var bool To store status of Other users page. */
+    public $otherusers;
+
     /**
      * Constructs the table
      *
@@ -644,8 +647,6 @@ class course_enrolment_users_table extends course_enrolment_table {
  */
 class course_enrolment_other_users_table extends course_enrolment_table {
 
-    public $otherusers = true;
-
     /**
      * Constructs the table
      *
diff --git a/favourites/classes/local/entity/favourite.php b/favourites/classes/local/entity/favourite.php
index a10a8f27014..f8a564dd8d2 100644
--- a/favourites/classes/local/entity/favourite.php
+++ b/favourites/classes/local/entity/favourite.php
@@ -59,6 +59,9 @@ class favourite {
     /** @var int $timemodified the time at which the last modification of the favourite took place.*/
     public $timemodified;
 
+    /** @var string $uniquekey favourite unique key.*/
+    public $uniquekey;
+
     /**
      * Favourite constructor.
      * @param string $component the frankenstyle name of the component containing the favourited item. E.g. 'core_course'.
diff --git a/favourites/classes/local/repository/favourite_repository.php b/favourites/classes/local/repository/favourite_repository.php
index c9403be5b55..f65461a583e 100644
--- a/favourites/classes/local/repository/favourite_repository.php
+++ b/favourites/classes/local/repository/favourite_repository.php
@@ -95,7 +95,8 @@ class favourite_repository implements favourite_repository_interface {
             'ordering' => false,
             'timecreated' => false,
             'timemodified' => false,
-            'id' => false
+            'id' => false,
+            'uniquekey' => false
         ];
 
         $requiredfields = array_filter($allowedfields, function($field) {
diff --git a/favourites/tests/repository_test.php b/favourites/tests/repository_test.php
index 1488096b4c9..c83efcbcc29 100644
--- a/favourites/tests/repository_test.php
+++ b/favourites/tests/repository_test.php
@@ -81,28 +81,6 @@ class repository_test extends \advanced_testcase {
         $favouritesrepo->add($favcourse);
     }
 
-    /**
-     * Tests that malformed favourites cannot be saved.
-     */
-    public function test_add_malformed_favourite() {
-        list($user1context, $user2context, $course1context, $course2context) = $this->setup_users_and_courses();
-
-        // Create a favourites repository and favourite a course.
-        $favouritesrepo = new favourite_repository($user1context);
-
-        $favcourse = new favourite(
-            'core_course',
-            'course',
-            $course1context->instanceid,
-            $course1context->id,
-            $user1context->instanceid
-        );
-        $favcourse->something = 'something';
-
-        $this->expectException('moodle_exception');
-        $favouritesrepo->add($favcourse);
-    }
-
     /**
      * Tests that incomplete favourites cannot be saved.
      */
diff --git a/filter/tex/latex.php b/filter/tex/latex.php
index 825a63072b0..9a6b3294df9 100644
--- a/filter/tex/latex.php
+++ b/filter/tex/latex.php
@@ -10,6 +10,9 @@
         var $temp_dir;
         var $error;
 
+        /** @var bool To store value of supported_platform. */
+        protected $supported_platform;
+
         /**
          * Constructor - create temporary directories and build paths to
          * external 'helper' binaries.
diff --git a/media/player/videojs/classes/plugin.php b/media/player/videojs/classes/plugin.php
index eb7c2189ef1..8694163551d 100644
--- a/media/player/videojs/classes/plugin.php
+++ b/media/player/videojs/classes/plugin.php
@@ -285,7 +285,7 @@ class media_videojs_plugin extends core_media_player_native {
             $url = reset($urls);
 
             // Check against regex.
-            if (preg_match($this->get_regex_youtube(), $url->out(false), $this->matches)) {
+            if (preg_match($this->get_regex_youtube(), $url->out(false), $matches)) {
                 $this->youtube = true;
                 return array($url);
             }
diff --git a/message/output/popup/tests/api_test.php b/message/output/popup/tests/api_test.php
index df6371c15a9..b94f1dd43d1 100644
--- a/message/output/popup/tests/api_test.php
+++ b/message/output/popup/tests/api_test.php
@@ -34,6 +34,9 @@ require_once($CFG->dirroot . '/message/output/popup/tests/base.php');
 class api_test extends \advanced_testcase {
     use \message_popup_test_helper;
 
+    /** @var \phpunit_message_sink message redirection. */
+    public $messagesink;
+
     /**
      * Test set up.
      *
diff --git a/message/output/popup/tests/externallib_test.php b/message/output/popup/tests/externallib_test.php
index 5e5d4b33729..1b27e023057 100644
--- a/message/output/popup/tests/externallib_test.php
+++ b/message/output/popup/tests/externallib_test.php
@@ -37,6 +37,9 @@ require_once($CFG->dirroot . '/message/output/popup/tests/base.php');
 class externallib_test extends \advanced_testcase {
     use message_popup_test_helper;
 
+    /** @var \phpunit_message_sink message redirection. */
+    public $messagesink;
+
     /**
      * Test set up.
      *
diff --git a/mod/h5pactivity/classes/local/attempt.php b/mod/h5pactivity/classes/local/attempt.php
index d039b3a1e85..4e8724feeb5 100644
--- a/mod/h5pactivity/classes/local/attempt.php
+++ b/mod/h5pactivity/classes/local/attempt.php
@@ -52,7 +52,6 @@ class attempt {
      */
     public function __construct(stdClass $record) {
         $this->record = $record;
-        $this->results = null;
     }
 
     /**
diff --git a/portfolio/mahara/lib.php b/portfolio/mahara/lib.php
index ee725bd2c07..09ae1eb89f0 100644
--- a/portfolio/mahara/lib.php
+++ b/portfolio/mahara/lib.php
@@ -50,6 +50,9 @@ class portfolio_plugin_mahara extends portfolio_plugin_pull_base {
     private $totalsize; // total size of all included files added together
     private $continueurl; // if we've been sent back a specific url to continue to (eg folder id)
 
+    /** @var mnet_environment the equivalent of old $MNET global. */
+    public $mnet;
+
     protected function init() {
         $this->mnet = get_mnet_environment();
     }
diff --git a/rating/tests/externallib_test.php b/rating/tests/externallib_test.php
index 32d16c3b2bf..e4890ed1f76 100644
--- a/rating/tests/externallib_test.php
+++ b/rating/tests/externallib_test.php
@@ -46,6 +46,45 @@ require_once($CFG->dirroot . '/rating/lib.php');
  */
 class externallib_test extends externallib_advanced_testcase {
 
+    /** @var \stdClass course record. */
+    protected $course;
+
+    /** @var \stdClass user record. */
+    protected $student1;
+
+    /** @var \stdClass user record. */
+    protected $teacher1;
+
+    /** @var \stdClass user record. */
+    protected $student2;
+
+    /** @var \stdClass user record. */
+    protected $teacher2;
+
+    /** @var \stdClass user record. */
+    protected $student3;
+
+    /** @var \stdClass user record. */
+    protected $teacher3;
+
+    /** @var \stdClass activity record. */
+    protected $forum;
+
+    /** @var \stdClass activity record. */
+    protected $discussion;
+
+    /** @var int context instance ID. */
+    protected $contextid;
+
+    /** @var \stdClass forum post. */
+    protected $post;
+
+    /** @var \stdClass a fieldset object, false or exception if error not found. */
+    protected $studentrole;
+
+    /** @var \stdClass a fieldset object, false or exception if error not found. */
+    protected $teacherrole;
+
     /*
      * Set up for every test
      */
diff --git a/report/competency/classes/output/report.php b/report/competency/classes/output/report.php
index d7926053258..6527b013b1b 100644
--- a/report/competency/classes/output/report.php
+++ b/report/competency/classes/output/report.php
@@ -55,6 +55,8 @@ class report implements renderable, templatable {
     protected $moduleid;
     /** @var array $competencies */
     protected $competencies;
+    /** @var int The user id */
+    protected $userid;
 
     /**
      * Construct this renderable.
diff --git a/report/infectedfiles/classes/table/infectedfiles_table.php b/report/infectedfiles/classes/table/infectedfiles_table.php
index 358e9d8c45f..8e3fee288cd 100644
--- a/report/infectedfiles/classes/table/infectedfiles_table.php
+++ b/report/infectedfiles/classes/table/infectedfiles_table.php
@@ -37,6 +37,10 @@ require_once($CFG->libdir . '/tablelib.php');
  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
 class infectedfiles_table extends \table_sql implements \renderable {
+
+    /** @var int current page. */
+    protected $page;
+
     /**
      * Table constructor
      *
diff --git a/report/log/user.php b/report/log/user.php
index 4bd72c61435..103f3f659eb 100644
--- a/report/log/user.php
+++ b/report/log/user.php
@@ -137,10 +137,6 @@ if (!empty($reportlog->selectedlogreader)) {
 
 echo $output->reader_selector($reportlog);
 
-if ($mode === 'all') {
-    $reportlog->selecteddate = 0;
-}
-
 // Print the graphic chart accordingly to the mode (all, today).
 echo '<div class="graph">';
 report_log_print_graph($course, $user, $mode, 0, $logreader);
diff --git a/report/outline/tests/lib_test.php b/report/outline/tests/lib_test.php
index ecd938e57d9..5a3d16989be 100644
--- a/report/outline/tests/lib_test.php
+++ b/report/outline/tests/lib_test.php
@@ -63,7 +63,6 @@ class lib_test extends \advanced_testcase {
 
     public function setUp(): void {
         $this->user = $this->getDataGenerator()->create_user();
-        $this->user2 = $this->getDataGenerator()->create_user();
         $this->course = $this->getDataGenerator()->create_course();
         $this->tree = new \core_user\output\myprofile\tree();
         $this->coursecontext = \context_course::instance($this->course->id);
diff --git a/report/participation/index.php b/report/participation/index.php
index 6683087ee89..08eb85e71d5 100644
--- a/report/participation/index.php
+++ b/report/participation/index.php
@@ -147,7 +147,6 @@ if (!empty($instanceid) && !empty($roleid)) {
     }
 
     $table = new flexible_table('course-participation-'.$course->id.'-'.$cm->id.'-'.$roleid);
-    $table->course = $course;
 
     $actionheader = !empty($action) ? get_string($action) : get_string('allactions');
 
diff --git a/report/progress/tests/report_progress_helper_testcase.php b/report/progress/tests/report_progress_helper_testcase.php
index 3360f35b6d2..02bce7c70dd 100644
--- a/report/progress/tests/report_progress_helper_testcase.php
+++ b/report/progress/tests/report_progress_helper_testcase.php
@@ -32,6 +32,9 @@ defined('MOODLE_INTERNAL') || die();
  */
 class report_progress_helper_testcase extends advanced_testcase {
 
+    /** @var testing_data_generator data generator.*/
+    protected $generator;
+
     /**
      * Set up testcase.
      */
diff --git a/search/classes/base.php b/search/classes/base.php
index c3678125ff1..f73238e569f 100644
--- a/search/classes/base.php
+++ b/search/classes/base.php
@@ -66,6 +66,13 @@ abstract class base {
      */
     protected static $levels = [CONTEXT_SYSTEM];
 
+    /**
+     * An area id from the componentname and the area name.
+     *
+     * @var string
+     */
+    public $areaid;
+
     /**
      * Constructor.
      *
diff --git a/search/classes/base_activity.php b/search/classes/base_activity.php
index 713fa6d813c..8519b5bdf98 100644
--- a/search/classes/base_activity.php
+++ b/search/classes/base_activity.php
@@ -54,6 +54,9 @@ abstract class base_activity extends base_mod {
      */
     protected static $levels = [CONTEXT_MODULE];
 
+    /** @var array activity data instance. */
+    public $activitiesdata = [];
+
     /**
      * Returns recordset containing all activities within the given context.
      *
diff --git a/search/engine/simpledb/tests/privacy/provider_test.php b/search/engine/simpledb/tests/privacy/provider_test.php
index 17d250a6da4..9bc628fb36f 100644
--- a/search/engine/simpledb/tests/privacy/provider_test.php
+++ b/search/engine/simpledb/tests/privacy/provider_test.php
@@ -42,6 +42,33 @@ require_once($CFG->dirroot . '/search/tests/fixtures/mock_search_area.php');
  */
 class provider_test extends \core_privacy\tests\provider_testcase {
 
+    /** @var \search_simpledb\engine database engine. */
+    protected $engine;
+
+    /** @var \testable_core_search core search class adapted to unit test. */
+    protected $search;
+
+    /** @var \core_search_generator core search generator class adapted to unit test. */
+    protected $generator = null;
+
+    /** @var \stdClass course record.*/
+    protected $c1;
+
+    /** @var \stdClass course record.*/
+    protected $c2;
+
+    /** @var \context_course context instance. */
+    protected $c1context;
+
+    /** @var \context_course context instance. */
+    protected $c2context;
+
+    /** @var \stdClass user record. */
+    protected $u1;
+
+    /** @var \stdClass user record. */
+    protected $u2;
+
     public function setUp(): void {
         global $DB;
 
diff --git a/search/tests/fixtures/mock_search_engine.php b/search/tests/fixtures/mock_search_engine.php
index 20f4d3e93dd..6e51b6997ad 100644
--- a/search/tests/fixtures/mock_search_engine.php
+++ b/search/tests/fixtures/mock_search_engine.php
@@ -40,6 +40,9 @@ class engine extends \core_search\engine {
     /** @var array Schema updates applied */
     protected $schemaupdates = [];
 
+    /** @var array delete of course index. */
+    protected $deletes = [];
+
     public function is_installed() {
         return true;
     }
diff --git a/tag/classes/tag.php b/tag/classes/tag.php
index 0297522aa6d..c1d56bfc41e 100644
--- a/tag/classes/tag.php
+++ b/tag/classes/tag.php
@@ -74,6 +74,15 @@ class core_tag_tag {
     /** @var int option to hide standard tags when editing item tags */
     const HIDE_STANDARD = 2;
 
+    /** @var int|null tag context ID. */
+    public $taginstancecontextid;
+
+    /** @var int|null time modification. */
+    public $timemodified;
+
+    /** @var int|null 0 if not flagged or positive integer if flagged. */
+    public $flag;
+
     /**
      * Constructor. Use functions get(), get_by_name(), etc.
      *
@@ -83,6 +92,9 @@ class core_tag_tag {
         if (empty($record->id)) {
             throw new coding_exception("Record must contain at least field 'id'");
         }
+        // The following three variables must be added because the database ($record) does not contain them.
+        $this->taginstancecontextid = $record->taginstancecontextid ?? null;
+        $this->flag = $record->flag ?? null;
         $this->record = $record;
     }
 
diff --git a/webservice/lib.php b/webservice/lib.php
index 503deaf9809..6ff9d67ad3b 100644
--- a/webservice/lib.php
+++ b/webservice/lib.php
@@ -1255,6 +1255,9 @@ abstract class webservice_base_server extends webservice_server {
     /** @var  array List of struct classes generated for the web service methods. */
     protected $servicestructs;
 
+    /** @var string service class name. */
+    protected $serviceclass;
+
     /**
      * This method parses the request input, it needs to get:
      *  1/ user authentication - username+password or token