diff --git a/src/Glpi/Api/API.php b/src/Glpi/Api/API.php
index d9e570537b8..af6ce1b6899 100644
--- a/src/Glpi/Api/API.php
+++ b/src/Glpi/Api/API.php
@@ -93,21 +93,35 @@
 abstract class API
 {
     // permit writing to $_SESSION
+    /** @var bool  */
     protected $session_write = false;
+    /** @var string  */
 
     public static $api_url = "";
+    /** @var string  */
     public static $content_type = "application/json";
+    /** @var string  */
     protected $format          = "json";
+    /** @var string  */
     protected $iptxt           = "";
+    /** @var string  */
     protected $ipnum           = "";
+    /** @var array  */
     protected $app_tokens      = [];
+    /** @var int  */
     protected $apiclients_id   = 0;
+    /** @var ?DeprecatedInterface  */
     protected $deprecated_item = null;
+    /** @var string */
     protected $request_uri;
+    /** @var array */
     protected $url_elements;
+    /** @var string */
     protected $verb;
+    /** @var array */
     protected $parameters;
-    protected $debug           = 0;
+    /** @var bool */
+    protected $debug = false;
 
     /**
      * @param integer $nb Unused value
diff --git a/src/Glpi/Api/APIRest.php b/src/Glpi/Api/APIRest.php
index c860d6efa12..f8e137608ed 100644
--- a/src/Glpi/Api/APIRest.php
+++ b/src/Glpi/Api/APIRest.php
@@ -150,7 +150,7 @@ public function call()
         if (isset($this->parameters['debug'])) {
             $this->debug = $this->parameters['debug'];
             if (empty($this->debug)) {
-                $this->debug = 1;
+                $this->debug = true;
             }
         }
 
diff --git a/src/Glpi/Api/HL/Controller/AssetController.php b/src/Glpi/Api/HL/Controller/AssetController.php
index 323e9bfc747..baf36be9373 100644
--- a/src/Glpi/Api/HL/Controller/AssetController.php
+++ b/src/Glpi/Api/HL/Controller/AssetController.php
@@ -1528,7 +1528,7 @@ public function index(Request $request): Response
         return new JSONResponse($asset_paths);
     }
 
-    private static function getGlobalAssetSchema($asset_schemas)
+    private static function getGlobalAssetSchema(array $asset_schemas): array
     {
         $asset_types = self::getAssetTypes();
         $asset_schemas = array_filter($asset_schemas, static fn($key) => !str_starts_with($key, '_') && in_array($key, $asset_types, true), ARRAY_FILTER_USE_KEY);
diff --git a/src/Glpi/Api/HL/GraphQLGenerator.php b/src/Glpi/Api/HL/GraphQLGenerator.php
index 3b495705425..a92bedb2813 100644
--- a/src/Glpi/Api/HL/GraphQLGenerator.php
+++ b/src/Glpi/Api/HL/GraphQLGenerator.php
@@ -35,9 +35,12 @@
 
 namespace Glpi\Api\HL;
 
+use Closure;
 use Glpi\Api\HL\Doc as Doc;
 use Glpi\Debug\Profiler;
+use GraphQL\Type\Definition\ListOfType;
 use GraphQL\Type\Definition\ObjectType;
+use GraphQL\Type\Definition\ScalarType;
 use GraphQL\Type\Definition\Type;
 use Throwable;
 
@@ -57,6 +60,9 @@ private function normalizeTypeName(string $type_name): string
         return str_replace([' ', '-'], ['', '_'], $type_name);
     }
 
+    /**
+     * @return string
+     */
     public function getSchema()
     {
         Profiler::getInstance()->start('GraphQLGenerator::loadTypes', Profiler::CATEGORY_HLAPI);
@@ -87,7 +93,7 @@ public function getSchema()
         return $schema_str;
     }
 
-    private function writeType($type_name, ObjectType|callable $type): string
+    private function writeType(string $type_name, ObjectType|callable $type): string
     {
         $type_name = $this->normalizeTypeName($type_name);
         $type_str = "type $type_name {\n";
@@ -118,7 +124,7 @@ private function writeType($type_name, ObjectType|callable $type): string
         return $type_str;
     }
 
-    private function loadTypes()
+    private function loadTypes(): void
     {
         $component_schemas = OpenAPIGenerator::getComponentSchemas($this->api_version);
         foreach ($component_schemas as $schema_name => $schema) {
@@ -173,6 +179,13 @@ private function convertRESTSchemaToGraphQLSchema(string $schema_name, array $sc
         ]);
     }
 
+    /**
+     * @param array $property
+     * @param string|null $name
+     * @param string $prefix
+     *
+     * @return Closure|ListOfType|ObjectType|ScalarType|void
+     */
     private function convertRESTPropertyToGraphQLType(array $property, ?string $name = null, string $prefix = '')
     {
         $type = $property['type'] ?? 'string';
diff --git a/src/Glpi/Api/HL/RoutePath.php b/src/Glpi/Api/HL/RoutePath.php
index abf3b368848..1f232fee27d 100644
--- a/src/Glpi/Api/HL/RoutePath.php
+++ b/src/Glpi/Api/HL/RoutePath.php
@@ -224,6 +224,11 @@ public function getAttributesFromPath(string $path): array
         return $attributes;
     }
 
+    /**
+     * @param string $path
+     *
+     * @return bool
+     */
     public function isValidPath($path): bool
     {
         // Ensure no placeholders are left
@@ -368,13 +373,13 @@ public function matchesAPIVersion(string $api_version): bool
         );
     }
 
-    private function setPath(string $path)
+    private function setPath(string $path): void
     {
         $this->path = $path;
         $this->route->path = $path;
     }
 
-    private function setPriority(int $priority)
+    private function setPriority(int $priority): void
     {
         $this->priority = $priority;
         $this->route->priority = $priority;
diff --git a/src/Glpi/Application/Environment.php b/src/Glpi/Application/Environment.php
index fef52baa001..98b593b142a 100644
--- a/src/Glpi/Application/Environment.php
+++ b/src/Glpi/Application/Environment.php
@@ -69,6 +69,9 @@ public static function isSet(): bool
         return defined('GLPI_ENVIRONMENT_TYPE');
     }
 
+    /**
+     * @return array
+     */
     public static function getValues()
     {
         $values = [];
diff --git a/src/Glpi/Application/View/Extension/DocumentExtension.php b/src/Glpi/Application/View/Extension/DocumentExtension.php
index 45c33fb0c2b..eceb488e91b 100644
--- a/src/Glpi/Application/View/Extension/DocumentExtension.php
+++ b/src/Glpi/Application/View/Extension/DocumentExtension.php
@@ -49,7 +49,7 @@ class DocumentExtension extends AbstractExtension
     /**
      * Static cache for user defined files extensions icons.
      */
-    private static $extensionIcon = null;
+    private static ?array $extensionIcon = null;
 
     public function getFilters(): array
     {
diff --git a/src/Glpi/Application/View/Extension/PluginExtension.php b/src/Glpi/Application/View/Extension/PluginExtension.php
index cccade87050..1926ed11054 100644
--- a/src/Glpi/Application/View/Extension/PluginExtension.php
+++ b/src/Glpi/Application/View/Extension/PluginExtension.php
@@ -96,6 +96,14 @@ public function callPluginHookFunction(string $name, $params = null, bool $retur
         }
     }
 
+    /**
+     * @param string $plugin
+     * @param string $name
+     * @param array $params
+     * @param bool $return_result
+     *
+     * @return ($return_result is true ? mixed : void)
+     */
     public function callPluginOneHook(string $plugin, string $name, $params = null, bool $return_result = false)
     {
         $result = Plugin::doOneHook($plugin, $name, $params);
diff --git a/src/Glpi/Application/View/Extension/TeamExtension.php b/src/Glpi/Application/View/Extension/TeamExtension.php
index 58b19c1ef8e..7a15c8ce017 100644
--- a/src/Glpi/Application/View/Extension/TeamExtension.php
+++ b/src/Glpi/Application/View/Extension/TeamExtension.php
@@ -35,6 +35,7 @@
 
 namespace Glpi\Application\View\Extension;
 
+use CommonDBTM;
 use Glpi\Features\TeamworkInterface;
 use Twig\Extension\AbstractExtension;
 use Twig\TwigFilter;
@@ -51,6 +52,13 @@ public function getFilters(): array
         ];
     }
 
+    /**
+     * @param class-string<CommonDBTM> $itemtype
+     * @param int $role
+     * @param int $nb
+     *
+     * @return string
+     */
     public function getTeamRoleName($itemtype, int $role, int $nb = 1): string
     {
         if (is_a($itemtype, TeamworkInterface::class, true)) {
diff --git a/src/Glpi/Cache/I18nCache.php b/src/Glpi/Cache/I18nCache.php
index bcf32a0d487..f73fa1f6bcf 100644
--- a/src/Glpi/Cache/I18nCache.php
+++ b/src/Glpi/Cache/I18nCache.php
@@ -44,23 +44,39 @@
  */
 class I18nCache
 {
-    private $cache;
+    private CacheInterface $cache;
 
     public function __construct(CacheInterface $cache)
     {
         $this->cache = $cache;
     }
 
+    /**
+     * @param string $key
+     *
+     * @return mixed
+     */
     public function getItem($key)
     {
         return $this->cache->get($key);
     }
 
+    /**
+     * @param string $key
+     * @param mixed $value
+     *
+     * @return bool
+     */
     public function setItem($key, $value)
     {
         return $this->cache->set($key, $value);
     }
 
+    /**
+     * @param string $key
+     *
+     * @return bool
+     */
     public function removeItem($key)
     {
         return $this->cache->delete($key);
diff --git a/src/Glpi/CalDAV/Backend/Calendar.php b/src/Glpi/CalDAV/Backend/Calendar.php
index d98cacaeb4c..a6d07ac3cd7 100644
--- a/src/Glpi/CalDAV/Backend/Calendar.php
+++ b/src/Glpi/CalDAV/Backend/Calendar.php
@@ -170,6 +170,11 @@ public function createCalendar($principalPath, $calendarPath, array $properties)
         throw new NotImplemented('Calendar creation is not implemented');
     }
 
+    /**
+     * @param string $calendarId
+     *
+     * @return void
+     */
     public function deleteCalendar($calendarId)
     {
         throw new NotImplemented('Calendar deletion is not implemented');
@@ -257,6 +262,12 @@ public function updateCalendarObject($calendarId, $objectPath, $calendarData)
         return null;
     }
 
+    /**
+     * @param string $calendarId
+     * @param string $objectPath
+     *
+     * @return void
+     */
     public function deleteCalendarObject($calendarId, $objectPath)
     {
 
diff --git a/src/Glpi/CalDAV/Backend/Principal.php b/src/Glpi/CalDAV/Backend/Principal.php
index 29ff307211f..802d4b99ad4 100644
--- a/src/Glpi/CalDAV/Backend/Principal.php
+++ b/src/Glpi/CalDAV/Backend/Principal.php
@@ -104,6 +104,12 @@ public function getPrincipalByPath($path)
         return $this->getPrincipalFromItem($item);
     }
 
+    /**
+     * @param string $path
+     * @param PropPatch $propPatch
+     *
+     * @return void
+     */
     public function updatePrincipal($path, PropPatch $propPatch)
     {
         throw new NotImplemented('Principal update is not implemented');
@@ -232,6 +238,12 @@ public function getGroupMembership($path)
         return $groups_uris;
     }
 
+    /**
+     * @param string $path
+     * @param array $members
+     *
+     * @return void
+     */
     public function setGroupMemberSet($path, array $members)
     {
         throw new NotImplemented('Group member set update is not implemented');
diff --git a/src/Glpi/CalDAV/Plugin/CalDAV.php b/src/Glpi/CalDAV/Plugin/CalDAV.php
index cc684016ac8..26e5270f40f 100644
--- a/src/Glpi/CalDAV/Plugin/CalDAV.php
+++ b/src/Glpi/CalDAV/Plugin/CalDAV.php
@@ -71,6 +71,12 @@ public function getCalendarHomeForPrincipal($principalUrl)
         return $calendar_uri;
     }
 
+    /**
+     * @param PropFind $propFind
+     * @param INode $node
+     *
+     * @return void
+     */
     public function propFind(PropFind $propFind, INode $node)
     {
 
diff --git a/src/Glpi/CalDAV/Server.php b/src/Glpi/CalDAV/Server.php
index f6fe51ed616..d6c70a1c108 100644
--- a/src/Glpi/CalDAV/Server.php
+++ b/src/Glpi/CalDAV/Server.php
@@ -90,8 +90,9 @@ public function __construct()
     }
 
     /**
-     *
      * @param Throwable $exception
+     *
+     * @return void
      */
     public function logException(Throwable $exception)
     {
diff --git a/src/Glpi/Console/Assets/CleanSoftwareCommand.php b/src/Glpi/Console/Assets/CleanSoftwareCommand.php
index 1d4e7be91e5..f92ee8b590a 100644
--- a/src/Glpi/Console/Assets/CleanSoftwareCommand.php
+++ b/src/Glpi/Console/Assets/CleanSoftwareCommand.php
@@ -77,6 +77,7 @@ protected function execute(InputInterface $input, OutputInterface $output)
      *
      * @param InputInterface $input
      *
+     * @return void
      * @throws InvalidArgumentException
      */
     private function validateInput(InputInterface $input)
diff --git a/src/Glpi/Console/Assets/PurgeSoftwareCommand.php b/src/Glpi/Console/Assets/PurgeSoftwareCommand.php
index 559451f05b4..ea4b01dcaf9 100644
--- a/src/Glpi/Console/Assets/PurgeSoftwareCommand.php
+++ b/src/Glpi/Console/Assets/PurgeSoftwareCommand.php
@@ -77,6 +77,7 @@ protected function execute(InputInterface $input, OutputInterface $output)
      *
      * @param InputInterface $input
      *
+     * @return void
      * @throws InvalidArgumentException
      */
     private function validateInput(InputInterface $input)
diff --git a/src/Glpi/Console/Cache/ClearCommand.php b/src/Glpi/Console/Cache/ClearCommand.php
index 9914ea9903e..194e47dd4e0 100644
--- a/src/Glpi/Console/Cache/ClearCommand.php
+++ b/src/Glpi/Console/Cache/ClearCommand.php
@@ -51,6 +51,7 @@ class ClearCommand extends Command
      */
     public const ERROR_CACHE_CLEAR_FAILURE = 1;
 
+    /** @var bool */
     protected $requires_db_up_to_date = false;
 
     protected function configure()
diff --git a/src/Glpi/Console/Cache/DebugCommand.php b/src/Glpi/Console/Cache/DebugCommand.php
index 128db9074af..832191a7483 100644
--- a/src/Glpi/Console/Cache/DebugCommand.php
+++ b/src/Glpi/Console/Cache/DebugCommand.php
@@ -46,6 +46,7 @@
 
 class DebugCommand extends Command
 {
+    /** @var bool */
     protected $requires_db_up_to_date = false;
 
     protected function configure()
diff --git a/src/Glpi/Console/CommandLoader.php b/src/Glpi/Console/CommandLoader.php
index 04dfff95b29..60e695ac8dc 100644
--- a/src/Glpi/Console/CommandLoader.php
+++ b/src/Glpi/Console/CommandLoader.php
@@ -160,7 +160,7 @@ private function getCommands()
      *
      * return void
      */
-    private function findCoreCommands()
+    private function findCoreCommands(): void
     {
 
         $basedir = $this->rootdir . DIRECTORY_SEPARATOR . 'src';
@@ -293,7 +293,7 @@ private function findPluginCommands()
      *
      * return void
      */
-    private function findToolsCommands()
+    private function findToolsCommands(): void
     {
 
         $basedir = $this->rootdir . DIRECTORY_SEPARATOR . 'tools';
diff --git a/src/Glpi/Console/Database/AbstractConfigureCommand.php b/src/Glpi/Console/Database/AbstractConfigureCommand.php
index c49773089ed..7887e47af69 100644
--- a/src/Glpi/Console/Database/AbstractConfigureCommand.php
+++ b/src/Glpi/Console/Database/AbstractConfigureCommand.php
@@ -265,6 +265,12 @@ protected function configureDatabase(
         } else {
             // Instanciate DB to be able to compute boolean properties flags.
             $db = new class ($db_hostport, $db_user, $db_pass, $db_name) extends DBmysql {
+                /**
+                 * @param string $dbhost
+                 * @param string $dbuser
+                 * @param string $dbpassword
+                 * @param string $dbdefault
+                 */
                 public function __construct($dbhost, $dbuser, $dbpassword, $dbdefault)
                 {
                     $this->dbhost     = $dbhost;
@@ -326,6 +332,17 @@ public function __construct($dbhost, $dbuser, $dbpassword, $dbdefault)
             $allow_datetime,
             $allow_signed_keys
         ) extends DBmysql {
+            /**
+             * @param string $dbhost
+             * @param string $dbuser
+             * @param string $dbpassword
+             * @param string $dbdefault
+             * @param bool $use_timezones
+             * @param bool $log_deprecation_warnings
+             * @param bool $use_utf8mb4
+             * @param bool $allow_datetime
+             * @param bool $allow_signed_keys
+             */
             public function __construct(
                 $dbhost,
                 $dbuser,
@@ -370,6 +387,7 @@ protected function isDbAlreadyConfigured()
      *
      * @param InputInterface $input
      *
+     * @return void
      * @throws InvalidArgumentException
      */
     protected function validateConfigInput(InputInterface $input)
@@ -438,6 +456,9 @@ private function checkTimezonesAvailability(mysqli $mysqli): bool
     {
 
         $db = new class ($mysqli) extends DBmysql {
+            /**
+             * @param mysqli $dbh
+             */
             public function __construct($dbh)
             {
                 $this->dbh = $dbh;
diff --git a/src/Glpi/Console/Database/InstallCommand.php b/src/Glpi/Console/Database/InstallCommand.php
index fa97a70831a..d5d45ad6a4d 100644
--- a/src/Glpi/Console/Database/InstallCommand.php
+++ b/src/Glpi/Console/Database/InstallCommand.php
@@ -264,6 +264,9 @@ protected function execute(InputInterface $input, OutputInterface $output)
 
         // Check for compatibility with utf8mb4 usage.
         $db = new class ($mysqli) extends DBmysql {
+            /**
+             * @param mysqli $dbh
+             */
             public function __construct($dbh)
             {
                 $this->dbh = $dbh;
diff --git a/src/Glpi/Console/Migration/AppliancesPluginToCoreCommand.php b/src/Glpi/Console/Migration/AppliancesPluginToCoreCommand.php
index 7083b7737fa..ef53556acea 100644
--- a/src/Glpi/Console/Migration/AppliancesPluginToCoreCommand.php
+++ b/src/Glpi/Console/Migration/AppliancesPluginToCoreCommand.php
@@ -218,7 +218,7 @@ private function checkPlugin(): bool
      *
      * @throws RuntimeException
      */
-    private function cleanCoreTables()
+    private function cleanCoreTables(): void
     {
         $core_tables = [
             Appliance::getTable(),
diff --git a/src/Glpi/Console/Migration/RacksPluginToCoreCommand.php b/src/Glpi/Console/Migration/RacksPluginToCoreCommand.php
index 18a20df9a59..74040bc0070 100644
--- a/src/Glpi/Console/Migration/RacksPluginToCoreCommand.php
+++ b/src/Glpi/Console/Migration/RacksPluginToCoreCommand.php
@@ -389,7 +389,7 @@ private function checkPlugin()
      *
      * @throws RuntimeException
      */
-    private function cleanCoreTables()
+    private function cleanCoreTables(): void
     {
 
         $core_tables = [
@@ -417,7 +417,7 @@ private function cleanCoreTables()
     }
 
 
-    private function migratePlugin()
+    private function migratePlugin(): bool
     {
 
         $no_interaction = $this->input->getOption('no-interaction');
diff --git a/src/Glpi/ContentTemplates/TemplateDocumentation.php b/src/Glpi/ContentTemplates/TemplateDocumentation.php
index f68df134cc2..f5d9a79ea4b 100644
--- a/src/Glpi/ContentTemplates/TemplateDocumentation.php
+++ b/src/Glpi/ContentTemplates/TemplateDocumentation.php
@@ -102,6 +102,8 @@ public function build(): string
      * @param string $title              Section's title
      * @param array $parameters          Parameters to be displayed in this section
      * @param string|null $fields_prefix Prefix to happen to the parameters fields name
+     *
+     * @return void
      */
     public function addSection(
         string $title,
diff --git a/src/Glpi/Controller/Form/QuestionActorsDropdownController.php b/src/Glpi/Controller/Form/QuestionActorsDropdownController.php
index 98fd5ab768c..e852cfa2827 100644
--- a/src/Glpi/Controller/Form/QuestionActorsDropdownController.php
+++ b/src/Glpi/Controller/Form/QuestionActorsDropdownController.php
@@ -93,7 +93,7 @@ private function loadTargetForm(Request $request): Form
         return $form;
     }
 
-    private function checkFormAccessPolicies(Request $request)
+    private function checkFormAccessPolicies(Request $request): void
     {
         $form_access_manager = FormAccessControlManager::getInstance();
 
diff --git a/src/Glpi/Controller/RequestException.php b/src/Glpi/Controller/RequestException.php
index ce7dd3636d7..647447d732a 100644
--- a/src/Glpi/Controller/RequestException.php
+++ b/src/Glpi/Controller/RequestException.php
@@ -41,6 +41,12 @@ final class RequestException extends Exception
 {
     protected int $http_code;
 
+    /**
+     * @param int $http_code
+     * @param string $message
+     * @param int $code
+     * @param Exception $previous
+     */
     public function __construct($http_code, $message, $code = 0, $previous = null)
     {
         $this->http_code = $http_code;
diff --git a/src/Glpi/Csv/PlanningCsv.php b/src/Glpi/Csv/PlanningCsv.php
index 6e5835fe543..fcd19016363 100644
--- a/src/Glpi/Csv/PlanningCsv.php
+++ b/src/Glpi/Csv/PlanningCsv.php
@@ -44,9 +44,9 @@
  **/
 class PlanningCsv implements ExportToCsvInterface
 {
-    private $users_id;
-    private $groups_id;
-    private $limititemtype;
+    private int $users_id;
+    private ?int $groups_id;
+    private string $limititemtype;
 
     /**
      * @param int     $who            user ID
diff --git a/src/Glpi/DBAL/QueryFunction.php b/src/Glpi/DBAL/QueryFunction.php
index d3fab416156..74853498c1c 100644
--- a/src/Glpi/DBAL/QueryFunction.php
+++ b/src/Glpi/DBAL/QueryFunction.php
@@ -82,6 +82,12 @@ private static function getExpression(string $func_name, array $params, ?string
         return new QueryExpression($func_name . '(' . implode(', ', $params) . ')', $alias);
     }
 
+    /**
+     * @param string $name
+     * @param array $arguments
+     *
+     * @return QueryExpression
+     */
     public static function __callStatic(string $name, array $arguments)
     {
         $args = array_values($arguments);
diff --git a/src/Glpi/DBAL/QuerySubQuery.php b/src/Glpi/DBAL/QuerySubQuery.php
index eb740a027aa..bdccfc79eb3 100644
--- a/src/Glpi/DBAL/QuerySubQuery.php
+++ b/src/Glpi/DBAL/QuerySubQuery.php
@@ -44,7 +44,7 @@
  **/
 class QuerySubQuery extends AbstractQuery
 {
-    private $dbiterator;
+    private DBmysqlIterator $dbiterator;
 
     /**
      * Create a sub query
diff --git a/src/Glpi/DBAL/QueryUnion.php b/src/Glpi/DBAL/QueryUnion.php
index 2beacfe9403..60d9244759a 100644
--- a/src/Glpi/DBAL/QueryUnion.php
+++ b/src/Glpi/DBAL/QueryUnion.php
@@ -44,23 +44,21 @@
  **/
 class QueryUnion extends AbstractQuery
 {
-    private $queries = [];
-    private $distinct = false;
+    private array $queries = [];
 
     /**
      * Create a sub query
      *
      * @param array $queries An array of queries to union. Either SubQuery objects
      *                          or an array of criteria to build them.
-     *                          You can also add later using @param boolean $distinct Include duplicates or not. Turning on may has
+     * @param boolean $distinct Include duplicates or not. Turning on may has
      *                          huge cost on queries performances.
      * @param string $alias Union ALIAS. Defaults to null.
      * @see addQuery
      */
-    public function __construct(array $queries = [], $distinct = false, $alias = null)
+    public function __construct(array $queries = [], private $distinct = false, $alias = null)
     {
         parent::__construct($alias);
-        $this->distinct = $distinct;
 
         foreach ($queries as $query) {
             $this->addQuery($query);
@@ -72,6 +70,8 @@ public function __construct(array $queries = [], $distinct = false, $alias = nul
      *
      * @param QuerySubQuery|array $query Either a SubQuery object
      *                                   or an array of criteria to build it.
+     *
+     * @return void
      */
     public function addQuery($query)
     {
diff --git a/src/Glpi/Dashboard/Dashboard.php b/src/Glpi/Dashboard/Dashboard.php
index e5b6f3606f7..2bf7c15ac11 100644
--- a/src/Glpi/Dashboard/Dashboard.php
+++ b/src/Glpi/Dashboard/Dashboard.php
@@ -46,14 +46,22 @@
 
 class Dashboard extends CommonDBTM
 {
+    /** @var int */
     protected $id      = 0;
+    /** @var string */
     protected $key     = "";
+    /** @var string */
     protected $title   = "";
+    /** @var bool */
     protected $embed   = false;
+    /** @var ?array  */
     protected $items   = null;
+    /** @var ?array */
     protected $rights  = null;
+    /** @var string */
     protected $filters  = "";
 
+    /** @var array */
     public static $all_dashboards = [];
     public static $rightname = 'dashboard';
 
@@ -621,6 +629,11 @@ public static function importFromJson($import = null)
         return true;
     }
 
+    /**
+     * @param bool $is_private
+     *
+     * @return bool
+     */
     public function setPrivate($is_private)
     {
         $this->load();
@@ -632,6 +645,9 @@ public function setPrivate($is_private)
         ]);
     }
 
+    /**
+     * @return string (int as string... should be a boolean.)
+     */
     public function getPrivate()
     {
         $this->load();
diff --git a/src/Glpi/Dashboard/Grid.php b/src/Glpi/Dashboard/Grid.php
index cee28f79612..aac846c8734 100644
--- a/src/Glpi/Dashboard/Grid.php
+++ b/src/Glpi/Dashboard/Grid.php
@@ -61,16 +61,24 @@
 
 class Grid
 {
+    /** @var int */
     protected $cell_margin     = 3;
+    /** @var int */
     protected $grid_cols       = 26;
+    /** @var int */
     protected $grid_rows       = 24;
+    /** @var string */
     protected $current         = "";
     /** @var Dashboard|null */
     protected $dashboard       = null;
+    /** @var array */
     protected $items           = [];
+    /** @var string */
     protected $context            = '';
 
+    /** @var bool */
     public static $embed              = false;
+    /** @var array */
     public static $all_dashboards     = [];
 
     public function __construct(string $dashboard_key = "central", int $grid_cols = 26, int $grid_rows = 24, string $context = 'core')
@@ -194,6 +202,9 @@ public function canViewCurrent(): bool
      * Do we have the right to view at least one dashboard?
      *
      * This can be optionally restricted to a specific context.
+     *
+     * @param ?string $context
+     *
      * @return bool
      */
     public static function canViewOneDashboard($context = null): bool
@@ -486,6 +497,9 @@ public function show(bool $mini = false, ?string $token = null)
     }
 
 
+    /**
+     * @return void
+     */
     public function showDefault()
     {
         echo "<div class='card p-3'>";
@@ -496,6 +510,10 @@ public function showDefault()
 
     /**
      * Init embed session
+     *
+     * @param array $params
+     *
+     * @return void
      */
     public function initEmbedSession(array $params = [])
     {
@@ -1464,6 +1482,11 @@ public function getAllDasboardCards($force = false): array
     }
 
 
+    /**
+     * @param string $interface
+     *
+     * @return array
+     */
     public function getRights($interface = 'central')
     {
         return [
diff --git a/src/Glpi/Dashboard/Palette.php b/src/Glpi/Dashboard/Palette.php
index c34dbd73927..b5e7b045fb7 100644
--- a/src/Glpi/Dashboard/Palette.php
+++ b/src/Glpi/Dashboard/Palette.php
@@ -40,6 +40,7 @@
 
 final class Palette
 {
+    /** @var string[] */
     private $colors = [];
 
     private const DEFAULT = "tab10";
diff --git a/src/Glpi/Dashboard/Provider.php b/src/Glpi/Dashboard/Provider.php
index 045b426c495..b90a3dce3a7 100644
--- a/src/Glpi/Dashboard/Provider.php
+++ b/src/Glpi/Dashboard/Provider.php
@@ -167,6 +167,9 @@ public static function bigNumberItem(?CommonDBTM $item = null, array $params = [
     /**
      * @method array bigNumberItem(CommonDBTM $item, array $params = [])
      * @method array nbItemByFk(CommonDBTM $item, array $params = [])
+     * @method array articleListItem(CommonDBTM $item, array $params = [])
+     *
+     * @return array|void
      */
     public static function __callStatic(string $name = "", array $arguments = [])
     {
@@ -1750,6 +1753,12 @@ final public static function getSearchFiltersCriteria(string $table = "", array
         return ['criteria' => $s_criteria];
     }
 
+    /**
+     * @param string $table
+     * @param array $apply_filters
+     *
+     * @return array
+     */
     public static function getFiltersCriteria(string $table = "", array $apply_filters = [])
     {
         $where = [];
diff --git a/src/Glpi/Dashboard/Widget.php b/src/Glpi/Dashboard/Widget.php
index d27f0b40b7a..7f705d2dc6f 100644
--- a/src/Glpi/Dashboard/Widget.php
+++ b/src/Glpi/Dashboard/Widget.php
@@ -57,6 +57,7 @@
  **/
 class Widget
 {
+    /** @var int */
     public static $animation_duration = 1000; // in millseconds
 
 
diff --git a/src/Glpi/Debug/Profile.php b/src/Glpi/Debug/Profile.php
index 69897e5666d..ceac7b20019 100644
--- a/src/Glpi/Debug/Profile.php
+++ b/src/Glpi/Debug/Profile.php
@@ -64,6 +64,7 @@ final class Profile
 
     private static ?self $current = null;
 
+    /** @var bool */
     private $disabled = false;
 
     public function __construct(string $id, ?string $parent_id)
@@ -137,6 +138,12 @@ public function getParentID(): ?string
         return $this->parent_id;
     }
 
+    /**
+     * @param string $widget
+     * @param mixed $data
+     *
+     * @return void
+     */
     public function setData(string $widget, $data)
     {
         if ($this->disabled) {
@@ -148,6 +155,15 @@ public function setData(string $widget, $data)
         $this->additional_info[$widget][] = $data;
     }
 
+    /**
+     * @param string $query
+     * @param float $time
+     * @param int $rows
+     * @param string $errors
+     * @param string $warnings
+     *
+     * @return void
+     */
     public function addSQLQueryData(string $query, float $time, int $rows = 0, string $errors = '', string $warnings = '')
     {
         if ($this->disabled) {
diff --git a/src/Glpi/Debug/Profiler.php b/src/Glpi/Debug/Profiler.php
index f43114e9b05..167ac38dbe9 100644
--- a/src/Glpi/Debug/Profiler.php
+++ b/src/Glpi/Debug/Profiler.php
@@ -46,6 +46,7 @@ final class Profiler
     /** @var ProfilerSection[] */
     private $current_sections = [];
 
+    /** @var bool */
     private $disabled = false;
 
     public const CATEGORY_BOOT = 'boot';
@@ -57,6 +58,7 @@ final class Profiler
     public const CATEGORY_CUSTOMOBJECTS = 'customobjects';
     public const CATEGORY_HLAPI = 'hlapi';
 
+    /** @var ?self */
     private static $instance;
 
     public static function getInstance(): self
@@ -91,7 +93,7 @@ public function start(string $name, string $category = self::CATEGORY_CORE): voi
             $parent_id = array_key_last($this->current_sections);
             $parent_id = $this->current_sections[$parent_id]->getId();
         }
-        $this->current_sections[] = new ProfilerSection($category, $name, microtime(true) * 1000, $parent_id);
+        $this->current_sections[] = new ProfilerSection($category, $name, (int) (microtime(true) * 1000), $parent_id);
     }
 
     /**
@@ -137,7 +139,7 @@ public function stop(string $name, bool $auto_ended = false): int
         if (count($section)) {
             $k = array_key_last($section);
             $section = array_pop($section);
-            $section->end(microtime(true) * 1000);
+            $section->end((int) (microtime(true) * 1000));
             $duration = $section->getDuration();
             unset($this->current_sections[$k]);
             Profile::getCurrent()->setData('profiler', $section->toArray() + ['auto_ended' => $auto_ended]);
diff --git a/src/Glpi/Debug/ProfilerSection.php b/src/Glpi/Debug/ProfilerSection.php
index d70da71cb55..1d22eb74fb9 100644
--- a/src/Glpi/Debug/ProfilerSection.php
+++ b/src/Glpi/Debug/ProfilerSection.php
@@ -56,6 +56,13 @@ final class ProfilerSection
      */
     private array $pauses = [];
 
+    /**
+     * @param string $category
+     * @param string $name
+     * @param int $start
+     * @param ?string $parent_id
+     * @param ?string $id
+     */
     public function __construct(string $category, string $name, $start, ?string $parent_id = null, ?string $id = null)
     {
         $this->id = $id ?? Uuid::uuid4()->toString();
@@ -65,6 +72,11 @@ public function __construct(string $category, string $name, $start, ?string $par
         $this->start = (int) $start;
     }
 
+    /**
+     * @param int $time
+     *
+     * @return void
+     */
     public function end($time): void
     {
         // Force resume to complete the last pause.
diff --git a/src/Glpi/Event.php b/src/Glpi/Event.php
index 3fae0e8feb7..0a63de6d3a2 100644
--- a/src/Glpi/Event.php
+++ b/src/Glpi/Event.php
@@ -108,12 +108,14 @@ public function delete(array $input, $force = false, $history = true)
      * Log the event $event on the glpi_event table with all the others args, if
      * $level is above or equal to setting from configuration.
      *
-     * @param $items_id
-     * @param $type
-     * @param $level
-     * @param $service
-     * @param $event
-     **/
+     * @param string|int $items_id
+     * @param string $type
+     * @param int $level
+     * @param string $service
+     * @param string $event
+     *
+     * @return void
+     */
     public static function log($items_id, $type, $level, $service, $event)
     {
         global $CFG_GLPI, $DB;
@@ -154,7 +156,7 @@ public static function log($items_id, $type, $level, $service, $event)
     /**
      * Clean old event - Call by cron
      *
-     * @param $day integer
+     * @param int $day
      *
      * @return integer number of events deleted
      **/
@@ -175,7 +177,9 @@ public static function cleanOld($day)
 
     /**
      * Return arrays for function showEvent et lastEvent
-     **/
+     *
+     * @return array
+     */
     public static function logArray()
     {
 
@@ -218,8 +222,10 @@ public static function logArray()
     }
 
     /**
-     * @param $type
-     * @param $items_id
+     * @param class-string<CommonDBTM> $type
+     * @param int $items_id
+     *
+     * @return void
      **/
     public static function displayItemLogID($type, $items_id)
     {
@@ -281,7 +287,9 @@ public static function displayItemLogID($type, $items_id)
      *
      * @param string $user  name user to search on message (default '')
      * @param bool $display if false, return html
-     **/
+     *
+     * @return void|string
+     */
     public static function showForUser(string $user = "", bool $display = true)
     {
         global $CFG_GLPI, $DB;
diff --git a/src/Glpi/Exception/PasswordTooWeakException.php b/src/Glpi/Exception/PasswordTooWeakException.php
index 38fd2e4a68c..ab5b92cb10d 100644
--- a/src/Glpi/Exception/PasswordTooWeakException.php
+++ b/src/Glpi/Exception/PasswordTooWeakException.php
@@ -39,13 +39,22 @@
 
 class PasswordTooWeakException extends Exception
 {
+    /** @var array */
     private $messages = [];
 
+    /**
+     * @param string $message
+     *
+     * @return void
+     */
     public function addMessage($message)
     {
         $this->messages[] = $message;
     }
 
+    /**
+     * @return array
+     */
     public function getMessages()
     {
         return $this->messages;
diff --git a/src/Glpi/Features/AssignableItem.php b/src/Glpi/Features/AssignableItem.php
index 6153019a319..b7d79ab4155 100644
--- a/src/Glpi/Features/AssignableItem.php
+++ b/src/Glpi/Features/AssignableItem.php
@@ -338,21 +338,35 @@ public function updateGroupFields()
         $this->loadGroupFields();
     }
 
-    /** @see AssignableItemInterface::post_addItem() */
+    /**
+     * @see AssignableItemInterface::post_addItem()
+     *
+     * @return void
+     */
     public function post_addItem()
     {
         parent::post_addItem();
         $this->updateGroupFields();
     }
 
-    /** @see AssignableItemInterface::post_updateItem() */
+    /**
+     * @see AssignableItemInterface::post_updateItem()
+     *
+     * @param bool $history
+     *
+     *@return void
+     */
     public function post_updateItem($history = true)
     {
         parent::post_updateItem($history);
         $this->updateGroupFields();
     }
 
-    /** @see AssignableItemInterface::getEmpty() */
+    /**
+     * @see AssignableItemInterface::getEmpty()
+     *
+     * @return bool
+     */
     public function getEmpty()
     {
         if (!parent::getEmpty()) {
@@ -365,7 +379,7 @@ public function getEmpty()
         return true;
     }
 
-    private function loadGroupFields()
+    private function loadGroupFields(): void
     {
         global $DB;
 
@@ -389,7 +403,11 @@ private function loadGroupFields()
         }
     }
 
-    /** @see AssignableItemInterface::post_getFromDB() */
+    /**
+     * @see AssignableItemInterface::post_getFromDB()
+     *
+     * @return void
+     */
     public function post_getFromDB()
     {
         $this->loadGroupFields();
diff --git a/src/Glpi/Features/AssignableItemInterface.php b/src/Glpi/Features/AssignableItemInterface.php
index df575b6f9bd..6eb93449424 100644
--- a/src/Glpi/Features/AssignableItemInterface.php
+++ b/src/Glpi/Features/AssignableItemInterface.php
@@ -59,22 +59,53 @@ public static function getAssignableVisiblityCriteria(): array;
      */
     public function getRights($interface = 'central');
 
+    /**
+     * @param array $input
+     *
+     * @return false|array
+     */
     public function prepareGroupFields(array $input);
 
+    /**
+     * @param array $input
+     *
+     * @return false|array
+     */
     public function prepareInputForAdd($input);
 
+    /**
+     * @param array $input
+     *
+     * @return false|array
+     */
     public function prepareInputForUpdate($input);
 
+    /**
+     * @return void
+     */
     public function post_addItem();
 
+    /**
+     * @param bool $history
+     *
+     * @return void
+     */
     public function post_updateItem($history = true);
 
+    /**
+     * @return bool
+     */
     public function getEmpty();
 
+    /**
+     * @return void
+     */
     public function post_getFromDB();
 
     /**
      * Update the values in the 'glpi_groups_items' link table as needed based on the groups set in the 'groups_id' and 'groups_id_tech' fields.
+     *
+     * @return void
      */
     public function updateGroupFields();
 }
diff --git a/src/Glpi/Features/Inventoriable.php b/src/Glpi/Features/Inventoriable.php
index aea37d80462..ba069dae462 100644
--- a/src/Glpi/Features/Inventoriable.php
+++ b/src/Glpi/Features/Inventoriable.php
@@ -52,6 +52,9 @@ trait Inventoriable
 {
     protected ?Agent $agent = null;
 
+    /**
+     * @return bool
+     */
     public function pre_purgeInventory()
     {
         $file_name = $this->getInventoryFileName();
@@ -182,6 +185,8 @@ protected function showInventoryInfo()
 
     /**
      * Display agent information
+     *
+     * @return void
      */
     protected function displayAgentInformation()
     {
diff --git a/src/Glpi/Features/KanbanInterface.php b/src/Glpi/Features/KanbanInterface.php
index 9b233ac0416..8a245374232 100644
--- a/src/Glpi/Features/KanbanInterface.php
+++ b/src/Glpi/Features/KanbanInterface.php
@@ -125,9 +125,25 @@ public function prepareKanbanStateForUpdate($oldstate, $newstate, $users_id);
      */
     public function canOrderKanbanCard($ID);
 
+    /**
+     * @param class-string<\CommonDBTM> $itemtype
+     *
+     * @return array
+     */
     public static function getKanbanPluginFilters($itemtype);
 
+    /**
+     * @param bool $full
+     *
+     * @return string
+     */
     public static function getGlobalKanbanUrl(bool $full = true);
 
+    /**
+     * @param int $items_id
+     * @param bool $full
+     *
+     * @return string
+     */
     public function getKanbanUrlWithID(int $items_id, bool $full = true);
 }
diff --git a/src/Glpi/Features/TreeBrowseInterface.php b/src/Glpi/Features/TreeBrowseInterface.php
index 6d3362b8f7b..c391f717943 100644
--- a/src/Glpi/Features/TreeBrowseInterface.php
+++ b/src/Glpi/Features/TreeBrowseInterface.php
@@ -38,6 +38,13 @@
 
 interface TreeBrowseInterface
 {
+    /**
+     * @param string $itemtype
+     * @param array $params
+     * @param bool $update
+     *
+     * @return void
+     */
     public static function showBrowseView(string $itemtype, array $params, $update = false);
 
     /**
diff --git a/src/Glpi/Form/Form.php b/src/Glpi/Form/Form.php
index 900eea488a9..0156359f0f8 100644
--- a/src/Glpi/Form/Form.php
+++ b/src/Glpi/Form/Form.php
@@ -94,6 +94,7 @@ final class Form extends CommonDBTM implements
     ConditionableVisibilityInterface
 {
     use ConditionableVisibilityTrait;
+    /** @use Clonable<static> */
     use Clonable {
         Clonable::prepareInputForClone as parentPrepareInputForClone;
         Clonable::post_clone as parentPostClone;
diff --git a/src/Glpi/ItemTranslation/ItemTranslation.php b/src/Glpi/ItemTranslation/ItemTranslation.php
index 3848e9473ff..d3572a38664 100644
--- a/src/Glpi/ItemTranslation/ItemTranslation.php
+++ b/src/Glpi/ItemTranslation/ItemTranslation.php
@@ -67,6 +67,11 @@ public function prepareInputForUpdate($input): array
         return $this->prepapreInput($input);
     }
 
+    /**
+     * @param array $input
+     *
+     * @return array
+     */
     public function prepapreInput($input): array
     {
         if (isset($input['translations'])) {
diff --git a/src/Glpi/Mail/Protocol/ProtocolInterface.php b/src/Glpi/Mail/Protocol/ProtocolInterface.php
index 2185f84e616..9629b32d661 100644
--- a/src/Glpi/Mail/Protocol/ProtocolInterface.php
+++ b/src/Glpi/Mail/Protocol/ProtocolInterface.php
@@ -52,6 +52,8 @@ public function setNoValidateCert(bool $novalidatecert);
      * @param  string      $host  hostname or IP address of POP3 server
      * @param  int|null    $port  server port, null value with fallback to default port
      * @param  string|bool $ssl   use 'SSL', 'TLS' or false
+     *
+     * @return void
      */
     public function connect($host, $port = null, $ssl = false);
 
diff --git a/src/Glpi/Mail/SMTP/OauthProvider/ProviderInterface.php b/src/Glpi/Mail/SMTP/OauthProvider/ProviderInterface.php
index c35e0d3d643..b5de2fa79ca 100644
--- a/src/Glpi/Mail/SMTP/OauthProvider/ProviderInterface.php
+++ b/src/Glpi/Mail/SMTP/OauthProvider/ProviderInterface.php
@@ -50,6 +50,9 @@ public function __construct(array $options = []);
     public function getAuthorizationUrl(array $options = []);
 
     /**
+     * @param string $grant
+     * @param array $options
+     *
      * @return AccessTokenInterface
      * @see \League\OAuth2\Client\Provider\AbstractProvider::getAccessToken()
      */
diff --git a/src/Glpi/Marketplace/Api/Plugins.php b/src/Glpi/Marketplace/Api/Plugins.php
index 111581a8efe..ccb6b5ab906 100644
--- a/src/Glpi/Marketplace/Api/Plugins.php
+++ b/src/Glpi/Marketplace/Api/Plugins.php
@@ -36,6 +36,7 @@
 namespace Glpi\Marketplace\Api;
 
 use GLPINetwork;
+use GuzzleHttp\Client;
 use GuzzleHttp\Exception\ConnectException;
 use GuzzleHttp\Exception\RequestException;
 use GuzzleHttp\Psr7\Message;
@@ -50,13 +51,15 @@
 
 class Plugins
 {
+    /** @var ?Client */
     protected $httpClient  = null;
+    /** @var ?array  */
     protected $last_error  = null;
 
     public const COL_PAGE    = 200;
 
     /**
-     * Max request attemps on READ operations.
+     * Max request attempts on READ operations.
      *
      * @var integer
      */
@@ -69,6 +72,7 @@ class Plugins
      */
     protected $is_list_truncated = false;
 
+    /** @var ?array */
     public static $plugins = null;
 
     public function __construct()
diff --git a/src/Glpi/Marketplace/Controller.php b/src/Glpi/Marketplace/Controller.php
index 8b12c488429..ad2cab221d0 100644
--- a/src/Glpi/Marketplace/Controller.php
+++ b/src/Glpi/Marketplace/Controller.php
@@ -63,9 +63,11 @@
  */
 class Controller extends CommonGLPI
 {
+    /** @var string */
     protected $plugin_key = "";
 
     public static $rightname = 'config';
+    /** @var ?PluginsApi */
     public static $api       = null;
 
     /**
@@ -425,6 +427,11 @@ public static function getAllUpdates()
     }
 
 
+    /**
+     * @param string $name
+     *
+     * @return array
+     */
     public static function cronInfo($name)
     {
         return ['description' => __('Check all plugin updates')];
diff --git a/src/Glpi/Marketplace/NotificationTargetController.php b/src/Glpi/Marketplace/NotificationTargetController.php
index 9912749ab88..b284cedfb30 100644
--- a/src/Glpi/Marketplace/NotificationTargetController.php
+++ b/src/Glpi/Marketplace/NotificationTargetController.php
@@ -92,6 +92,9 @@ public function addDataForTemplate($event, $options = [])
     }
 
 
+    /**
+     * @return void
+     */
     public function getTags()
     {
         //Tags with just lang
diff --git a/src/Glpi/Marketplace/View.php b/src/Glpi/Marketplace/View.php
index 9c7f5abb073..aa763699c56 100644
--- a/src/Glpi/Marketplace/View.php
+++ b/src/Glpi/Marketplace/View.php
@@ -53,6 +53,7 @@
 class View extends CommonGLPI
 {
     public static $rightname = 'config';
+    /** @var ?PluginsApi */
     public static $api       = null;
 
     public $get_item_to_display_tab = true;
@@ -85,6 +86,9 @@ public static function canCreate(): bool
     }
 
 
+    /**
+     * @return string
+     */
     public static function getIcon()
     {
         return "ti ti-building-store";
diff --git a/src/Glpi/OAuth/AccessTokenRepository.php b/src/Glpi/OAuth/AccessTokenRepository.php
index 3ef05c94bc4..7ab4143007f 100644
--- a/src/Glpi/OAuth/AccessTokenRepository.php
+++ b/src/Glpi/OAuth/AccessTokenRepository.php
@@ -42,6 +42,13 @@
 
 class AccessTokenRepository implements AccessTokenRepositoryInterface
 {
+    /**
+     * @param ClientEntityInterface $clientEntity
+     * @param array $scopes
+     * @param ?string $userIdentifier
+     *
+     * @return AccessTokenEntityInterface
+     */
     public function getNewToken(ClientEntityInterface $clientEntity, array $scopes, $userIdentifier = null): AccessTokenEntityInterface
     {
         $token = new AccessToken();
@@ -68,6 +75,11 @@ public function persistNewAccessToken(AccessTokenEntityInterface $accessTokenEnt
         ]);
     }
 
+    /**
+     * @param string $tokenId
+     *
+     * @return void
+     */
     public function revokeAccessToken($tokenId): void
     {
         global $DB;
@@ -75,6 +87,11 @@ public function revokeAccessToken($tokenId): void
         $DB->delete('glpi_oauth_access_tokens', ['identifier' => $tokenId]);
     }
 
+    /**
+     * @param string $tokenId
+     *
+     * @return bool
+     */
     public function isAccessTokenRevoked($tokenId): bool
     {
         global $DB;
diff --git a/src/Glpi/OAuth/AuthCodeRepository.php b/src/Glpi/OAuth/AuthCodeRepository.php
index d98e9ee6c5d..a180cf31e9c 100644
--- a/src/Glpi/OAuth/AuthCodeRepository.php
+++ b/src/Glpi/OAuth/AuthCodeRepository.php
@@ -61,6 +61,11 @@ public function persistNewAuthCode(AuthCodeEntityInterface $authCodeEntity): voi
         ]);
     }
 
+    /**
+     * @param string $codeId
+     *
+     * @return void
+     */
     public function revokeAuthCode($codeId): void
     {
         global $DB;
@@ -68,6 +73,11 @@ public function revokeAuthCode($codeId): void
         $DB->delete('glpi_oauth_auth_codes', ['identifier' => $codeId]);
     }
 
+    /**
+     * @param string $codeId
+     *
+     * @return bool
+     */
     public function isAuthCodeRevoked($codeId): bool
     {
         global $DB;
diff --git a/src/Glpi/OAuth/Client.php b/src/Glpi/OAuth/Client.php
index 38e714348fe..0888ff067cf 100644
--- a/src/Glpi/OAuth/Client.php
+++ b/src/Glpi/OAuth/Client.php
@@ -50,6 +50,11 @@ public function __construct()
         $this->isConfidential = true;
     }
 
+    /**
+     * @param string $name
+     *
+     * @return void
+     */
     public function setName(string $name)
     {
         $this->name = $name;
diff --git a/src/Glpi/OAuth/ClientRepository.php b/src/Glpi/OAuth/ClientRepository.php
index ccc90cb4d03..4400bcc3102 100644
--- a/src/Glpi/OAuth/ClientRepository.php
+++ b/src/Glpi/OAuth/ClientRepository.php
@@ -44,6 +44,11 @@
 
 class ClientRepository implements ClientRepositoryInterface
 {
+    /**
+     * @param string $clientIdentifier
+     *
+     * @return ?ClientEntityInterface
+     */
     public function getClientEntity($clientIdentifier): ?ClientEntityInterface
     {
         global $DB;
@@ -67,6 +72,11 @@ public function getClientEntity($clientIdentifier): ?ClientEntityInterface
     }
 
     /**
+     * @param string $clientIdentifier
+     * @param string $clientSecret
+     * @param string $grantType
+     *
+     * @return bool
      * @throws OAuthServerException If the requested grant type is not allowed for the client
      */
     public function validateClient($clientIdentifier, $clientSecret, $grantType): bool
diff --git a/src/Glpi/OAuth/RefreshTokenRepository.php b/src/Glpi/OAuth/RefreshTokenRepository.php
index 1a170dc7a90..ab89aa03387 100644
--- a/src/Glpi/OAuth/RefreshTokenRepository.php
+++ b/src/Glpi/OAuth/RefreshTokenRepository.php
@@ -59,6 +59,11 @@ public function persistNewRefreshToken(RefreshTokenEntityInterface $refreshToken
         ]);
     }
 
+    /**
+     * @param string $tokenId
+     *
+     * @return void
+     */
     public function revokeRefreshToken($tokenId): void
     {
         global $DB;
@@ -68,6 +73,11 @@ public function revokeRefreshToken($tokenId): void
         ]);
     }
 
+    /**
+     * @param string $tokenId
+     *
+     * @return bool
+     */
     public function isRefreshTokenRevoked($tokenId): bool
     {
         global $DB;
diff --git a/src/Glpi/OAuth/ScopeRepository.php b/src/Glpi/OAuth/ScopeRepository.php
index 7e1c73a4ce9..3ed796eb51a 100644
--- a/src/Glpi/OAuth/ScopeRepository.php
+++ b/src/Glpi/OAuth/ScopeRepository.php
@@ -50,6 +50,15 @@ public function getScopeEntityByIdentifier($identifier): ?ScopeEntityInterface
         return $scope;
     }
 
+    /**
+     * @param array $scopes
+     * @param string $grantType
+     * @param ClientEntityInterface $clientEntity
+     * @param ?string $userIdentifier
+     * @param ?string $authCodeId
+     *
+     * @return ScopeEntityInterface[]
+     */
     public function finalizeScopes(array $scopes, $grantType, ClientEntityInterface $clientEntity, $userIdentifier = null, ?string $authCodeId = null): array
     {
         global $DB;
diff --git a/src/Glpi/OAuth/UserRepository.php b/src/Glpi/OAuth/UserRepository.php
index bd7b02bdafb..f938ff53de7 100644
--- a/src/Glpi/OAuth/UserRepository.php
+++ b/src/Glpi/OAuth/UserRepository.php
@@ -42,6 +42,14 @@
 
 class UserRepository implements UserRepositoryInterface
 {
+    /**
+     * @param string $username
+     * @param string $password
+     * @param string $grantType
+     * @param ClientEntityInterface $clientEntity
+     *
+     * @return ?UserEntityInterface
+     */
     public function getUserEntityByUserCredentials($username, $password, $grantType, ClientEntityInterface $clientEntity): ?UserEntityInterface
     {
         $auth = new Auth();
diff --git a/src/Glpi/Search/Output/HTMLSearchOutput.php b/src/Glpi/Search/Output/HTMLSearchOutput.php
index c5a5178353d..994c3b0e639 100644
--- a/src/Glpi/Search/Output/HTMLSearchOutput.php
+++ b/src/Glpi/Search/Output/HTMLSearchOutput.php
@@ -275,6 +275,12 @@ public function displayData(array $data, array $params = [])
         $_SESSION['glpimassiveactionselected'] = [];
     }
 
+    /**
+     * @param bool $odd
+     * @param bool $is_deleted
+     *
+     * @return string
+     */
     public static function showNewLine($odd = false, $is_deleted = false): string
     {
         $class = " class='tab_bg_2" . ($is_deleted ? '_2' : '') . "' ";
@@ -294,7 +300,13 @@ public static function showBeginHeader(): string
         return '<thead>';
     }
 
-    public static function showHeader($rows, $cols, $fixed = 0): string
+    /**
+     * @param int $rows
+     * @param int $cols
+     * @param bool $fixed
+     * @return string
+     */
+    public static function showHeader($rows, $cols, $fixed = false): string
     {
         if ($fixed) {
             return "<div class='text-center'><table class='table'>";
@@ -303,7 +315,17 @@ public static function showHeader($rows, $cols, $fixed = 0): string
         return "<div class='text-center'><table class='table card-table table-hover'>";
     }
 
-    public static function showHeaderItem($value, &$num, $linkto = "", $issort = 0, $order = "", $options = ""): string
+    /**
+     * @param string $value
+     * @param int $num
+     * @param string $linkto
+     * @param bool $issort
+     * @param string $order
+     * @param string $options
+     *
+     * @return string
+     */
+    public static function showHeaderItem($value, &$num, $linkto = "", $issort = false, $order = "", $options = ""): string
     {
         $class = "";
         if ($issort) {
@@ -327,6 +349,14 @@ public static function showEndHeader(): string
         return '</thead>';
     }
 
+    /**
+     * @param string $value
+     * @param int $num
+     * @param int $row
+     * @param string $extraparam
+     *
+     * @return string
+     */
     public static function showItem($value, &$num, $row, $extraparam = ''): string
     {
         global $CFG_GLPI;
@@ -370,11 +400,22 @@ public static function showItem($value, &$num, $row, $extraparam = ''): string
         return $out;
     }
 
+    /**
+     * @param string $title
+     * @param ?int $count
+     *
+     * @return string
+     */
     public static function showFooter($title = "", $count = null): string
     {
         return "</table></div>\n";
     }
 
+    /**
+     * @param string $message
+     *
+     * @return string
+     */
     public static function showError($message = ''): string
     {
         return "<div class='center b'>" . \htmlescape($message) . "</div>";
diff --git a/src/Glpi/Search/Output/NamesListSearchOutput.php b/src/Glpi/Search/Output/NamesListSearchOutput.php
index 98c1582056b..c8bd43727b8 100644
--- a/src/Glpi/Search/Output/NamesListSearchOutput.php
+++ b/src/Glpi/Search/Output/NamesListSearchOutput.php
@@ -124,7 +124,14 @@ public static function showEndLine(): string
         return "\n";
     }
 
-    public static function showHeader($rows, $cols, $fixed = 0): string
+    /**
+     * @param int $rows
+     * @param int $cols
+     * @param bool $fixed
+     *
+     * @return string
+     */
+    public static function showHeader($rows, $cols, $fixed = false): string
     {
         if (!headers_sent()) {
             header("Content-disposition: filename=glpi.txt");
@@ -133,6 +140,14 @@ public static function showHeader($rows, $cols, $fixed = 0): string
         return '';
     }
 
+    /**
+     * @param string $value
+     * @param int $num
+     * @param int $row
+     * @param string $extraparam
+     *
+     * @return string
+     */
     public static function showItem($value, &$num, $row, $extraparam = ''): string
     {
         // We only want to display one column (the name of the item).
diff --git a/src/Glpi/Search/Output/Spreadsheet.php b/src/Glpi/Search/Output/Spreadsheet.php
index 81668b811ac..d3bd9b04e8b 100644
--- a/src/Glpi/Search/Output/Spreadsheet.php
+++ b/src/Glpi/Search/Output/Spreadsheet.php
@@ -51,6 +51,10 @@ abstract class Spreadsheet extends ExportSearchOutput
 {
     protected \PhpOffice\PhpSpreadsheet\Spreadsheet $spread;
     protected BaseWriter|IWriter $writer;
+    /**
+     * FIXME: remove in GLPI 12, seems not used
+     * @var int
+     */
     protected $count;
 
     public function __construct()
diff --git a/src/Glpi/Search/Output/Tcpdf.php b/src/Glpi/Search/Output/Tcpdf.php
index dc8e89807a2..63fb4eec1d3 100644
--- a/src/Glpi/Search/Output/Tcpdf.php
+++ b/src/Glpi/Search/Output/Tcpdf.php
@@ -56,6 +56,11 @@ protected function createExternalWriterInstance($orientation, $unit, $paperSize)
             null,
             false
         ) extends GLPIPDF {
+            /**
+             * @param bool $val
+             *
+             * @return void
+             */
             public function setPrintFooter($val = true)
             {
                 //override because \PhpOffice\PhpSpreadsheet\Writer\Pdf\Tcpdf::save() explicitly calls setPrintFooter(false) -_-
diff --git a/src/Glpi/Search/Provider/SQLProvider.php b/src/Glpi/Search/Provider/SQLProvider.php
index b142b35aaed..82356b6ab93 100644
--- a/src/Glpi/Search/Provider/SQLProvider.php
+++ b/src/Glpi/Search/Provider/SQLProvider.php
@@ -1142,7 +1142,17 @@ private static function getMainItemtypeSystemSQLCriteria(string $itemtype): stri
         return $dbi->analyseCrit($criteria);
     }
 
-    public static function getWhereCriteria($nott, $itemtype, $ID, $searchtype, $val, $meta = 0): ?array
+    /**
+     * @param bool $nott
+     * @param class-string<CommonDBTM> $itemtype
+     * @param int $ID
+     * @param string $searchtype
+     * @param string|int $val
+     * @param bool $meta
+     *
+     * @return ?array
+     */
+    public static function getWhereCriteria($nott, $itemtype, $ID, $searchtype, $val, $meta = false): ?array
     {
         global $DB;
 
diff --git a/src/Glpi/Search/SearchEngine.php b/src/Glpi/Search/SearchEngine.php
index aff73e4a18e..d3bc0612029 100644
--- a/src/Glpi/Search/SearchEngine.php
+++ b/src/Glpi/Search/SearchEngine.php
@@ -36,10 +36,12 @@
 namespace Glpi\Search;
 
 use AllAssets;
+use Change;
 use CommonDBTM;
 use CommonITILObject;
 use CommonITILTask;
 use CommonITILValidation;
+use Computer;
 use DisplayPreference;
 use Dropdown;
 use Entity;
@@ -65,10 +67,17 @@
 use ITILFollowup;
 use ITILSolution;
 use KnowbaseItem;
+use Monitor;
+use Peripheral;
+use Phone;
 use Plugin;
+use Printer;
+use Problem;
 use RuntimeException;
 use Search;
 use Session;
+use Software;
+use Ticket;
 use Toolbox;
 
 use function Safe\preg_match;
@@ -246,10 +255,9 @@ public static function isPossibleMetaSubitemOf(string $parent_itemtype, string $
     }
 
     /**
-     *
-     * @param $itemtype
+     * @param class-string<CommonDBTM> $itemtype
      * @return class-string<CommonDBTM>|false
-     **/
+     */
     public static function getMetaReferenceItemtype($itemtype)
     {
 
@@ -259,15 +267,15 @@ public static function getMetaReferenceItemtype($itemtype)
 
         // Use reference type if given itemtype extends a reference type.
         $types = [
-            'Computer',
-            'Problem',
-            'Change',
-            'Ticket',
-            'Printer',
-            'Monitor',
-            'Peripheral',
-            'Software',
-            'Phone',
+            Computer::class,
+            Problem::class,
+            Change::class,
+            Ticket::class,
+            Printer::class,
+            Monitor::class,
+            Peripheral::class,
+            Software::class,
+            Phone::class,
         ];
         foreach ($types as $type) {
             if (is_a($itemtype, $type, true)) {
diff --git a/src/Glpi/Search/SearchOption.php b/src/Glpi/Search/SearchOption.php
index a73097817bb..fab77ee7846 100644
--- a/src/Glpi/Search/SearchOption.php
+++ b/src/Glpi/Search/SearchOption.php
@@ -68,6 +68,7 @@
  * This is a wrapper class for the array format search option.
  *
  * @internal Not for use outside {@link Search} class and the "Glpi\Search" namespace.
+ * @implements ArrayAccess<string|int, mixed>
  */
 final class SearchOption implements ArrayAccess
 {
@@ -76,6 +77,7 @@ final class SearchOption implements ArrayAccess
      * @var array{id: int, name: string, field: string, table: string}
      */
     private array $search_opt_array;
+    /** @var array */
     private static $search_options_cache = [];
 
     public function __construct(array $search_opt_array)
@@ -426,6 +428,8 @@ public static function isInfocomOption($itemtype, $searchID): bool
     /**
      * @param class-string<CommonDBTM> $itemtype
      * @param integer $field_num
+     *
+     * @return array
      **/
     public static function getActionsFor($itemtype, $field_num)
     {
diff --git a/src/Glpi/Socket.php b/src/Glpi/Socket.php
index cdb7d6aa035..abbf29108d4 100644
--- a/src/Glpi/Socket.php
+++ b/src/Glpi/Socket.php
@@ -62,6 +62,7 @@ class Socket extends CommonDBChild
     // From CommonDBTM
     public $dohistory          = true;
     public static $rightname          = 'cable_management';
+    /** @var bool */
     public $can_be_translated  = false;
 
     public const REAR    = 1;
@@ -165,6 +166,11 @@ public function prepareInputForUpdate($input)
         return $input;
     }
 
+    /**
+     * @param array $input
+     *
+     * @return array
+     */
     public function retrievedataFromNetworkPort($input)
     {
         // get position from networkport if needed
@@ -315,8 +321,10 @@ public function post_getEmpty()
      *
      * @since 0.84
      *
-     * @param integer $value     status ID
-     **/
+     * @param int $value status ID
+     *
+     * @return int
+     */
     public static function getWiringSideName($value)
     {
         $tab  = static::getSides();
@@ -401,6 +409,9 @@ public function rawSearchOptions()
         return $tab;
     }
 
+    /**
+     * @return array
+     */
     public static function rawSearchOptionsToAdd()
     {
         $tab = [];
@@ -561,6 +572,9 @@ public function post_updateItem($history = true)
         $this->cleanIfStealNetworkPort();
     }
 
+    /**
+     * @return void
+     */
     public function cleanIfStealNetworkPort()
     {
         global $DB;
@@ -913,12 +927,12 @@ public static function showForLocation(Location $item): bool
     }
 
     /**
-     * @since 0.84
+     * @param ?HTMLTableRow $row
+     * @param ?CommonDBTM $item
+     * @param ?HTMLTableCell $father
+     * @param array $options
      *
-     * @param $row             HTMLTableRow object (default NULL)
-     * @param $item            CommonDBTM object (default NULL)
-     * @param $father          HTMLTableCell object (default NULL)
-     * @param $options   array
+     * @return void
      **/
     public static function getHTMLTableCellsForItem(
         ?HTMLTableRow $row = null,
diff --git a/src/Glpi/Stat/StatData.php b/src/Glpi/Stat/StatData.php
index 35fa88a137b..ad88add3e6c 100644
--- a/src/Glpi/Stat/StatData.php
+++ b/src/Glpi/Stat/StatData.php
@@ -42,11 +42,17 @@
  */
 abstract class StatData
 {
+    /** @var array */
     protected $labels;
+    /** @var array */
     protected $series;
+    /** @var int */
     protected $total;
+    /** @var string */
     protected $csv_link;
+    /** @var array */
     protected $options;
+    /** @var array */
     protected $params;
 
     public function __construct(array $params = [])
@@ -67,6 +73,12 @@ public function __construct(array $params = [])
         $this->total  = 0;
     }
 
+    /**
+     * @param array $params
+     * @param string $type
+     *
+     * @return ?array
+     */
     public function getDataByType(array $params, string $type)
     {
         return Stat::constructEntryValues(
diff --git a/src/Glpi/System/Log/LogViewer.php b/src/Glpi/System/Log/LogViewer.php
index 823b666821c..51a4e172845 100644
--- a/src/Glpi/System/Log/LogViewer.php
+++ b/src/Glpi/System/Log/LogViewer.php
@@ -158,6 +158,9 @@ public function showLogFile(string $filepath, bool $only_content = false): void
     }
 
 
+    /**
+     * @return string
+     */
     public static function getIcon()
     {
         return "ti ti-news";
diff --git a/src/Glpi/System/Requirement/SessionsSecurityConfiguration.php b/src/Glpi/System/Requirement/SessionsSecurityConfiguration.php
index 6a2bff9a4c6..d42a9123014 100644
--- a/src/Glpi/System/Requirement/SessionsSecurityConfiguration.php
+++ b/src/Glpi/System/Requirement/SessionsSecurityConfiguration.php
@@ -93,16 +93,25 @@ protected function check()
         }
     }
 
+    /**
+     * @return string
+     */
     protected function getCookiesSecure()
     {
         return ini_get('session.cookie_secure');
     }
 
+    /**
+     * @return string
+     */
     protected function getCookiesHttpOnly()
     {
         return ini_get('session.cookie_httponly');
     }
 
+    /**
+     * @return string
+     */
     protected function getCookiesSamesite(): string
     {
         return ini_get('session.cookie_samesite');
diff --git a/src/Glpi/System/RequirementsList.php b/src/Glpi/System/RequirementsList.php
index e1cbe07acdd..4725f4baf79 100644
--- a/src/Glpi/System/RequirementsList.php
+++ b/src/Glpi/System/RequirementsList.php
@@ -42,6 +42,7 @@
 
 /**
  * @since 9.5.0
+ * @implements IteratorAggregate<RequirementInterface>
  */
 class RequirementsList implements IteratorAggregate
 {
diff --git a/src/Glpi/Toolbox/MarkdownBuilder.php b/src/Glpi/Toolbox/MarkdownBuilder.php
index c02a44629de..8d01f4158ab 100644
--- a/src/Glpi/Toolbox/MarkdownBuilder.php
+++ b/src/Glpi/Toolbox/MarkdownBuilder.php
@@ -65,6 +65,8 @@ public function getMarkdown(): string
      * @param string $prefix Header type (#, ##, ...)
      * @param string $content Header content
      * @param string|null $css_class Css class to add to this header
+     *
+     * @return void
      */
     protected function addHeader(
         string $prefix,
@@ -80,6 +82,8 @@ protected function addHeader(
      *
      * @param string $content Header content
      * @param string|null $css_class Css class to add to this header
+     *
+     * @return void
      */
     public function addH1(string $content, ?string $css_class = null)
     {
@@ -91,6 +95,8 @@ public function addH1(string $content, ?string $css_class = null)
      *
      * @param string $content Header content
      * @param string|null $css_class Css class to add to this header
+     *
+     * @return void
      */
     public function addH2(string $content, ?string $css_class = null)
     {
@@ -102,6 +108,8 @@ public function addH2(string $content, ?string $css_class = null)
      *
      * @param string $content Header content
      * @param string|null $css_class Css class to add to this header
+     *
+     * @return void
      */
     public function addH3(string $content, ?string $css_class = null)
     {
@@ -113,6 +121,8 @@ public function addH3(string $content, ?string $css_class = null)
      *
      * @param string $content Header content
      * @param string|null $css_class Css class to add to this header
+     *
+     * @return void
      */
     public function addH4(string $content, ?string $css_class = null)
     {
@@ -124,6 +134,8 @@ public function addH4(string $content, ?string $css_class = null)
      *
      * @param string $content Header content
      * @param string|null $css_class Css class to add to this header
+     *
+     * @return void
      */
     public function addH5(string $content, ?string $css_class = null)
     {
@@ -135,6 +147,8 @@ public function addH5(string $content, ?string $css_class = null)
      *
      * @param string $content Header content
      * @param string|null $css_class Css class to add to this header
+     *
+     * @return void
      */
     public function addH6(string $content, ?string $css_class = null)
     {
@@ -145,6 +159,8 @@ public function addH6(string $content, ?string $css_class = null)
      * Add a table row
      *
      * @param array $values
+     *
+     * @return void
      */
     public function addTableRow(array $values)
     {
@@ -155,6 +171,8 @@ public function addTableRow(array $values)
      * Add a table header
      *
      * @param array $headers
+     *
+     * @return void
      */
     public function addTableHeader(array $headers)
     {
@@ -166,6 +184,8 @@ public function addTableHeader(array $headers)
     /**
      * Helper function to encapsulate single line code
      *
+     * @param string $code
+     *
      * @return string
      */
     public static function code($code): string
@@ -176,6 +196,8 @@ public static function code($code): string
     /**
      * Helper function create a navigation link
      *
+     * @param string $label
+     *
      * @return string
      */
     public static function navigationLink($label)
@@ -187,6 +209,8 @@ public static function navigationLink($label)
     /**
      * Helper function create a summary entry
      *
+     * @param string $label
+     *
      * @return void
      */
     public function addSummaryEntry($label)
diff --git a/src/Glpi/Toolbox/URL.php b/src/Glpi/Toolbox/URL.php
index 9dd1c0c7966..d7832ca52a3 100644
--- a/src/Glpi/Toolbox/URL.php
+++ b/src/Glpi/Toolbox/URL.php
@@ -188,7 +188,7 @@ private static function extractPluginItemtypeFromUrlPath(string $path): ?string
         }
     }
 
-    private static function extractedPathContainsNamespace(string $path)
+    private static function extractedPathContainsNamespace(string $path): bool
     {
         return str_contains($path, "/");
     }
diff --git a/src/Plugin.php b/src/Plugin.php
index 0bc02f1e8c1..2efbb486e0a 100644
--- a/src/Plugin.php
+++ b/src/Plugin.php
@@ -1872,7 +1872,7 @@ public static function doHookFunction($name, $parm = null)
      *                                  or callable function
      * @param mixed           ...$args  [optional] One or more arguments passed to hook function
      *
-     * @return mixed $data
+     * @return mixed|void $data
      **/
     public static function doOneHook($plugin_key, $hook, ...$args)
     {
diff --git a/src/Stat.php b/src/Stat.php
index 776bf0cfba9..b14825854f6 100644
--- a/src/Stat.php
+++ b/src/Stat.php
@@ -1650,7 +1650,7 @@ public static function showItems($target, $date1, $date2, $start, $itemtype = nu
 
             $header_num = 1;
             if ($is_html_output) {
-                echo $output::showHeader($end_display - $start + 1, 2, 1);
+                echo $output::showHeader($end_display - $start + 1, 2, true);
                 echo $output::showNewLine();
                 echo $output::showHeaderItem(_sn('Associated element', 'Associated elements', $numrows), $header_num);
                 if ($view_entities) {