diff --git a/src/Symfony/Bundle/FrameworkBundle/Routing/AnnotatedRouteControllerLoader.php b/src/Symfony/Bundle/FrameworkBundle/Routing/AnnotatedRouteControllerLoader.php
index ec03f849793df..498dc24d1ce75 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Routing/AnnotatedRouteControllerLoader.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Routing/AnnotatedRouteControllerLoader.php
@@ -27,7 +27,7 @@ class AnnotatedRouteControllerLoader extends AnnotationClassLoader
      *
      * @return void
      */
-    protected function configureRoute(Route $route, \ReflectionClass $class, \ReflectionMethod $method, object $annot)
+    protected function configureRoute(Route $route, \ReflectionClass $class, \ReflectionMethod $method, object $annot): void
     {
         if ('__invoke' === $method->getName()) {
             $route->setDefault('_controller', $class->getName());
diff --git a/src/Symfony/Component/Routing/Annotation/Route.php b/src/Symfony/Component/Routing/Annotation/Route.php
index bb8423101dee8..26b5853a119ac 100644
--- a/src/Symfony/Component/Routing/Annotation/Route.php
+++ b/src/Symfony/Component/Routing/Annotation/Route.php
@@ -76,26 +76,17 @@ public function __construct(
         }
     }
 
-    /**
-     * @return void
-     */
-    public function setPath(string $path)
+    public function setPath(string $path): void
     {
         $this->path = $path;
     }
 
-    /**
-     * @return string|null
-     */
-    public function getPath()
+    public function getPath(): ?string
     {
         return $this->path;
     }
 
-    /**
-     * @return void
-     */
-    public function setLocalizedPaths(array $localizedPaths)
+    public function setLocalizedPaths(array $localizedPaths): void
     {
         $this->localizedPaths = $localizedPaths;
     }
@@ -105,130 +96,82 @@ public function getLocalizedPaths(): array
         return $this->localizedPaths;
     }
 
-    /**
-     * @return void
-     */
-    public function setHost(string $pattern)
+    public function setHost(string $pattern): void
     {
         $this->host = $pattern;
     }
 
-    /**
-     * @return string|null
-     */
-    public function getHost()
+    public function getHost(): ?string
     {
         return $this->host;
     }
 
-    /**
-     * @return void
-     */
-    public function setName(string $name)
+    public function setName(string $name): void
     {
         $this->name = $name;
     }
 
-    /**
-     * @return string|null
-     */
-    public function getName()
+    public function getName(): ?string
     {
         return $this->name;
     }
 
-    /**
-     * @return void
-     */
-    public function setRequirements(array $requirements)
+    public function setRequirements(array $requirements): void
     {
         $this->requirements = $requirements;
     }
 
-    /**
-     * @return array
-     */
-    public function getRequirements()
+    public function getRequirements(): array
     {
         return $this->requirements;
     }
 
-    /**
-     * @return void
-     */
-    public function setOptions(array $options)
+    public function setOptions(array $options): void
     {
         $this->options = $options;
     }
 
-    /**
-     * @return array
-     */
-    public function getOptions()
+    public function getOptions(): array
     {
         return $this->options;
     }
 
-    /**
-     * @return void
-     */
-    public function setDefaults(array $defaults)
+    public function setDefaults(array $defaults): void
     {
         $this->defaults = $defaults;
     }
 
-    /**
-     * @return array
-     */
-    public function getDefaults()
+    public function getDefaults(): array
     {
         return $this->defaults;
     }
 
-    /**
-     * @return void
-     */
-    public function setSchemes(array|string $schemes)
+    public function setSchemes(array|string $schemes): void
     {
         $this->schemes = (array) $schemes;
     }
 
-    /**
-     * @return array
-     */
-    public function getSchemes()
+    public function getSchemes(): array
     {
         return $this->schemes;
     }
 
-    /**
-     * @return void
-     */
-    public function setMethods(array|string $methods)
+    public function setMethods(array|string $methods): void
     {
         $this->methods = (array) $methods;
     }
 
-    /**
-     * @return array
-     */
-    public function getMethods()
+    public function getMethods(): array
     {
         return $this->methods;
     }
 
-    /**
-     * @return void
-     */
-    public function setCondition(?string $condition)
+    public function setCondition(?string $condition): void
     {
         $this->condition = $condition;
     }
 
-    /**
-     * @return string|null
-     */
-    public function getCondition()
+    public function getCondition(): ?string
     {
         return $this->condition;
     }
diff --git a/src/Symfony/Component/Routing/DependencyInjection/RoutingResolverPass.php b/src/Symfony/Component/Routing/DependencyInjection/RoutingResolverPass.php
index edbecc1f0e176..16769d5545729 100644
--- a/src/Symfony/Component/Routing/DependencyInjection/RoutingResolverPass.php
+++ b/src/Symfony/Component/Routing/DependencyInjection/RoutingResolverPass.php
@@ -25,10 +25,7 @@ class RoutingResolverPass implements CompilerPassInterface
 {
     use PriorityTaggedServiceTrait;
 
-    /**
-     * @return void
-     */
-    public function process(ContainerBuilder $container)
+    public function process(ContainerBuilder $container): void
     {
         if (false === $container->hasDefinition('routing.resolver')) {
             return;
diff --git a/src/Symfony/Component/Routing/Generator/UrlGenerator.php b/src/Symfony/Component/Routing/Generator/UrlGenerator.php
index e3fb17e81c543..a2e1407340fc8 100644
--- a/src/Symfony/Component/Routing/Generator/UrlGenerator.php
+++ b/src/Symfony/Component/Routing/Generator/UrlGenerator.php
@@ -42,17 +42,8 @@ class UrlGenerator implements UrlGeneratorInterface, ConfigurableRequirementsInt
         '%2A' => '*',
     ];
 
-    protected $routes;
-    protected $context;
+    protected ?bool $strictRequirements = true;
 
-    /**
-     * @var bool|null
-     */
-    protected $strictRequirements = true;
-
-    protected $logger;
-
-    private ?string $defaultLocale;
 
     /**
      * This array defines the characters (besides alphanumeric ones) that will not be percent-encoded in the path segment of the generated URL.
@@ -62,7 +53,7 @@ class UrlGenerator implements UrlGeneratorInterface, ConfigurableRequirementsInt
      * "?" and "#" (would be interpreted wrongly as query and fragment identifier),
      * "'" and """ (are used as delimiters in HTML).
      */
-    protected $decodedChars = [
+    protected array $decodedChars = [
         // the slash can be used to designate a hierarchical structure and we want allow using it with this meaning
         // some webservers don't allow the slash in encoded form in the path for security reasons anyway
         // see http://stackoverflow.com/questions/4069002/http-400-if-2f-part-of-get-url-in-jboss
@@ -83,12 +74,12 @@ class UrlGenerator implements UrlGeneratorInterface, ConfigurableRequirementsInt
         '%7C' => '|',
     ];
 
-    public function __construct(RouteCollection $routes, RequestContext $context, LoggerInterface $logger = null, string $defaultLocale = null)
-    {
-        $this->routes = $routes;
-        $this->context = $context;
-        $this->logger = $logger;
-        $this->defaultLocale = $defaultLocale;
+    public function __construct(
+        protected RouteCollection $routes,
+        protected RequestContext $context,
+        protected ?LoggerInterface $logger = null,
+        private ?string $defaultLocale = null
+    ) {
     }
 
     /**
@@ -104,10 +95,7 @@ public function getContext(): RequestContext
         return $this->context;
     }
 
-    /**
-     * @return void
-     */
-    public function setStrictRequirements(?bool $enabled)
+    public function setStrictRequirements(?bool $enabled): void
     {
         $this->strictRequirements = $enabled;
     }
diff --git a/src/Symfony/Component/Routing/Loader/AnnotationClassLoader.php b/src/Symfony/Component/Routing/Loader/AnnotationClassLoader.php
index ca12eb8399c82..c9c7670de6dae 100644
--- a/src/Symfony/Component/Routing/Loader/AnnotationClassLoader.php
+++ b/src/Symfony/Component/Routing/Loader/AnnotationClassLoader.php
@@ -71,31 +71,20 @@
  */
 abstract class AnnotationClassLoader implements LoaderInterface
 {
-    protected $reader;
-    protected $env;
+    protected string $routeAnnotationClass = RouteAnnotation::class;
 
-    /**
-     * @var string
-     */
-    protected $routeAnnotationClass = RouteAnnotation::class;
-
-    /**
-     * @var int
-     */
-    protected $defaultRouteIndex = 0;
+    protected int $defaultRouteIndex = 0;
 
-    public function __construct(Reader $reader = null, string $env = null)
-    {
-        $this->reader = $reader;
-        $this->env = $env;
+    public function __construct(
+        protected ?Reader $reader = null,
+        protected ?string $env = null
+    ) {
     }
 
     /**
      * Sets the annotation class to read route properties from.
-     *
-     * @return void
      */
-    public function setRouteAnnotationClass(string $class)
+    public function setRouteAnnotationClass(string $class): void
     {
         $this->routeAnnotationClass = $class;
     }
@@ -160,10 +149,8 @@ public function load(mixed $class, string $type = null): RouteCollection
 
     /**
      * @param RouteAnnotation $annot or an object that exposes a similar interface
-     *
-     * @return void
      */
-    protected function addRoute(RouteCollection $collection, object $annot, array $globals, \ReflectionClass $class, \ReflectionMethod $method)
+    protected function addRoute(RouteCollection $collection, object $annot, array $globals, \ReflectionClass $class, \ReflectionMethod $method): void
     {
         if ($annot->getEnv() && $annot->getEnv() !== $this->env) {
             return;
@@ -263,10 +250,8 @@ public function getResolver(): LoaderResolverInterface
 
     /**
      * Gets the default route name for a class method.
-     *
-     * @return string
      */
-    protected function getDefaultRouteName(\ReflectionClass $class, \ReflectionMethod $method)
+    protected function getDefaultRouteName(\ReflectionClass $class, \ReflectionMethod $method): string
     {
         $name = str_replace('\\', '_', $class->name).'_'.$method->name;
         $name = \function_exists('mb_strtolower') && preg_match('//u', $name) ? mb_strtolower($name, 'UTF-8') : strtolower($name);
@@ -278,10 +263,7 @@ protected function getDefaultRouteName(\ReflectionClass $class, \ReflectionMetho
         return $name;
     }
 
-    /**
-     * @return array
-     */
-    protected function getGlobals(\ReflectionClass $class)
+    protected function getGlobals(\ReflectionClass $class): array
     {
         $globals = $this->resetGlobals();
 
@@ -363,18 +345,12 @@ private function resetGlobals(): array
         ];
     }
 
-    /**
-     * @return Route
-     */
-    protected function createRoute(string $path, array $defaults, array $requirements, array $options, ?string $host, array $schemes, array $methods, ?string $condition)
+    protected function createRoute(string $path, array $defaults, array $requirements, array $options, ?string $host, array $schemes, array $methods, ?string $condition): Route
     {
         return new Route($path, $defaults, $requirements, $options, $host, $schemes, $methods, $condition);
     }
 
-    /**
-     * @return void
-     */
-    abstract protected function configureRoute(Route $route, \ReflectionClass $class, \ReflectionMethod $method, object $annot);
+    abstract protected function configureRoute(Route $route, \ReflectionClass $class, \ReflectionMethod $method, object $annot): void;
 
     /**
      * @param \ReflectionClass|\ReflectionMethod $reflection
diff --git a/src/Symfony/Component/Routing/Loader/AnnotationFileLoader.php b/src/Symfony/Component/Routing/Loader/AnnotationFileLoader.php
index 5699824d8bc5f..2b4fa0de58649 100644
--- a/src/Symfony/Component/Routing/Loader/AnnotationFileLoader.php
+++ b/src/Symfony/Component/Routing/Loader/AnnotationFileLoader.php
@@ -24,17 +24,15 @@
  */
 class AnnotationFileLoader extends FileLoader
 {
-    protected $loader;
-
-    public function __construct(FileLocatorInterface $locator, AnnotationClassLoader $loader)
-    {
+    public function __construct(
+        FileLocatorInterface $locator,
+        protected AnnotationClassLoader $loader
+    ) {
         if (!\function_exists('token_get_all')) {
             throw new \LogicException('The Tokenizer extension is required for the routing annotation loaders.');
         }
 
         parent::__construct($locator);
-
-        $this->loader = $loader;
     }
 
     /**
diff --git a/src/Symfony/Component/Routing/Loader/ContainerLoader.php b/src/Symfony/Component/Routing/Loader/ContainerLoader.php
index 716ec499a9408..50a7fd8c99fc2 100644
--- a/src/Symfony/Component/Routing/Loader/ContainerLoader.php
+++ b/src/Symfony/Component/Routing/Loader/ContainerLoader.php
@@ -20,9 +20,7 @@
  */
 class ContainerLoader extends ObjectLoader
 {
-    private ContainerInterface $container;
-
-    public function __construct(ContainerInterface $container, string $env = null)
+    public function __construct(private ContainerInterface $container, string $env = null)
     {
         $this->container = $container;
         parent::__construct($env);
diff --git a/src/Symfony/Component/Routing/Loader/XmlFileLoader.php b/src/Symfony/Component/Routing/Loader/XmlFileLoader.php
index 24ec21bb5c7a7..540c020f6df6c 100644
--- a/src/Symfony/Component/Routing/Loader/XmlFileLoader.php
+++ b/src/Symfony/Component/Routing/Loader/XmlFileLoader.php
@@ -62,11 +62,9 @@ public function load(mixed $file, string $type = null): RouteCollection
     /**
      * Parses a node from a loaded XML file.
      *
-     * @return void
-     *
      * @throws \InvalidArgumentException When the XML is invalid
      */
-    protected function parseNode(RouteCollection $collection, \DOMElement $node, string $path, string $file)
+    protected function parseNode(RouteCollection $collection, \DOMElement $node, string $path, string $file): void
     {
         if (self::NAMESPACE_URI !== $node->namespaceURI) {
             return;
@@ -102,11 +100,9 @@ public function supports(mixed $resource, string $type = null): bool
     /**
      * Parses a route and adds it to the RouteCollection.
      *
-     * @return void
-     *
      * @throws \InvalidArgumentException When the XML is invalid
      */
-    protected function parseRoute(RouteCollection $collection, \DOMElement $node, string $path)
+    protected function parseRoute(RouteCollection $collection, \DOMElement $node, string $path): void
     {
         if ('' === $id = $node->getAttribute('id')) {
             throw new \InvalidArgumentException(sprintf('The <route> element in file "%s" must have an "id" attribute.', $path));
@@ -151,11 +147,9 @@ protected function parseRoute(RouteCollection $collection, \DOMElement $node, st
     /**
      * Parses an import and adds the routes in the resource to the RouteCollection.
      *
-     * @return void
-     *
      * @throws \InvalidArgumentException When the XML is invalid
      */
-    protected function parseImport(RouteCollection $collection, \DOMElement $node, string $path, string $file)
+    protected function parseImport(RouteCollection $collection, \DOMElement $node, string $path, string $file): void
     {
         /** @var \DOMElement $resourceElement */
         if (!($resource = $node->getAttribute('resource') ?: null) && $resourceElement = $node->getElementsByTagName('resource')[0] ?? null) {
diff --git a/src/Symfony/Component/Routing/Loader/YamlFileLoader.php b/src/Symfony/Component/Routing/Loader/YamlFileLoader.php
index bde72c0eb0cab..50e991cb1918d 100644
--- a/src/Symfony/Component/Routing/Loader/YamlFileLoader.php
+++ b/src/Symfony/Component/Routing/Loader/YamlFileLoader.php
@@ -112,10 +112,8 @@ public function supports(mixed $resource, string $type = null): bool
 
     /**
      * Parses a route and adds it to the RouteCollection.
-     *
-     * @return void
      */
-    protected function parseRoute(RouteCollection $collection, string $name, array $config, string $path)
+    protected function parseRoute(RouteCollection $collection, string $name, array $config, string $path): void
     {
         if (isset($config['alias'])) {
             $alias = $collection->addAlias($name, $config['alias']);
@@ -172,10 +170,8 @@ protected function parseRoute(RouteCollection $collection, string $name, array $
 
     /**
      * Parses an import and adds the routes in the resource to the RouteCollection.
-     *
-     * @return void
      */
-    protected function parseImport(RouteCollection $collection, array $config, string $path, string $file)
+    protected function parseImport(RouteCollection $collection, array $config, string $path, string $file): void
     {
         $type = $config['type'] ?? null;
         $prefix = $config['prefix'] ?? '';
@@ -242,12 +238,10 @@ protected function parseImport(RouteCollection $collection, array $config, strin
     }
 
     /**
-     * @return void
-     *
      * @throws \InvalidArgumentException If one of the provided config keys is not supported,
      *                                   something is missing or the combination is nonsense
      */
-    protected function validate(mixed $config, string $name, string $path)
+    protected function validate(mixed $config, string $name, string $path): void
     {
         if (!\is_array($config)) {
             throw new \InvalidArgumentException(sprintf('The definition of "%s" in "%s" must be a YAML array.', $name, $path));
diff --git a/src/Symfony/Component/Routing/Matcher/ExpressionLanguageProvider.php b/src/Symfony/Component/Routing/Matcher/ExpressionLanguageProvider.php
index 3aeebe699def5..955956be172ec 100644
--- a/src/Symfony/Component/Routing/Matcher/ExpressionLanguageProvider.php
+++ b/src/Symfony/Component/Routing/Matcher/ExpressionLanguageProvider.php
@@ -22,11 +22,8 @@
  */
 class ExpressionLanguageProvider implements ExpressionFunctionProviderInterface
 {
-    private ServiceProviderInterface $functions;
-
-    public function __construct(ServiceProviderInterface $functions)
+    public function __construct(private ServiceProviderInterface $functions)
     {
-        $this->functions = $functions;
     }
 
     public function getFunctions(): array
diff --git a/src/Symfony/Component/Routing/Matcher/TraceableUrlMatcher.php b/src/Symfony/Component/Routing/Matcher/TraceableUrlMatcher.php
index 417f156415c67..956d0270ef331 100644
--- a/src/Symfony/Component/Routing/Matcher/TraceableUrlMatcher.php
+++ b/src/Symfony/Component/Routing/Matcher/TraceableUrlMatcher.php
@@ -27,12 +27,12 @@ class TraceableUrlMatcher extends UrlMatcher
     public const ROUTE_ALMOST_MATCHES = 1;
     public const ROUTE_MATCHES = 2;
 
-    protected $traces;
-
     /**
-     * @return array
+     * @var array<string, string, int, null>
      */
-    public function getTraces(string $pathinfo)
+    protected array $traces;
+
+    public function getTraces(string $pathinfo): array
     {
         $this->traces = [];
 
@@ -44,10 +44,7 @@ public function getTraces(string $pathinfo)
         return $this->traces;
     }
 
-    /**
-     * @return array
-     */
-    public function getTracesForRequest(Request $request)
+    public function getTracesForRequest(Request $request): array
     {
         $this->request = $request;
         $traces = $this->getTraces($request->getPathInfo());
diff --git a/src/Symfony/Component/Routing/Matcher/UrlMatcher.php b/src/Symfony/Component/Routing/Matcher/UrlMatcher.php
index d1cee213778f3..cd73ff5e03af2 100644
--- a/src/Symfony/Component/Routing/Matcher/UrlMatcher.php
+++ b/src/Symfony/Component/Routing/Matcher/UrlMatcher.php
@@ -32,13 +32,10 @@ class UrlMatcher implements UrlMatcherInterface, RequestMatcherInterface
     public const REQUIREMENT_MISMATCH = 1;
     public const ROUTE_MATCH = 2;
 
-    /** @var RequestContext */
-    protected $context;
-
     /**
      * Collects HTTP methods that would be allowed for the request.
      */
-    protected $allow = [];
+    protected array $allow = [];
 
     /**
      * Collects URI schemes that would be allowed for the request.
@@ -47,7 +44,6 @@ class UrlMatcher implements UrlMatcherInterface, RequestMatcherInterface
      */
     protected array $allowSchemes = [];
 
-    protected $routes;
     protected $request;
     protected $expressionLanguage;
 
@@ -56,16 +52,13 @@ class UrlMatcher implements UrlMatcherInterface, RequestMatcherInterface
      */
     protected $expressionLanguageProviders = [];
 
-    public function __construct(RouteCollection $routes, RequestContext $context)
-    {
-        $this->routes = $routes;
-        $this->context = $context;
+    public function __construct(
+        protected RouteCollection $routes,
+        protected RequestContext $context
+    ) {
     }
 
-    /**
-     * @return void
-     */
-    public function setContext(RequestContext $context)
+    public function setContext(RequestContext $context): void
     {
         $this->context = $context;
     }
@@ -101,10 +94,7 @@ public function matchRequest(Request $request): array
         return $ret;
     }
 
-    /**
-     * @return void
-     */
-    public function addExpressionLanguageProvider(ExpressionFunctionProviderInterface $provider)
+    public function addExpressionLanguageProvider(ExpressionFunctionProviderInterface $provider): void
     {
         $this->expressionLanguageProviders[] = $provider;
     }
@@ -255,10 +245,7 @@ protected function mergeDefaults(array $params, array $defaults): array
         return $defaults;
     }
 
-    /**
-     * @return ExpressionLanguage
-     */
-    protected function getExpressionLanguage()
+    protected function getExpressionLanguage(): ExpressionLanguage
     {
         if (null === $this->expressionLanguage) {
             if (!class_exists(ExpressionLanguage::class)) {