diff --git a/src/Symfony/Bridge/Doctrine/Validator/Constraints/UniqueEntity.php b/src/Symfony/Bridge/Doctrine/Validator/Constraints/UniqueEntity.php
index 5e9048808023d..da1873cb91856 100644
--- a/src/Symfony/Bridge/Doctrine/Validator/Constraints/UniqueEntity.php
+++ b/src/Symfony/Bridge/Doctrine/Validator/Constraints/UniqueEntity.php
@@ -32,11 +32,11 @@ class UniqueEntity extends Constraint
 
     public $message = 'This value is already used.';
     public $service = 'doctrine.orm.validator.unique';
-    public $em = null;
-    public $entityClass = null;
+    public $em;
+    public $entityClass;
     public $repositoryMethod = 'findBy';
     public $fields = [];
-    public $errorPath = null;
+    public $errorPath;
     public $ignoreNull = true;
 
     /**
diff --git a/src/Symfony/Bridge/Monolog/Tests/Handler/MailerHandlerTest.php b/src/Symfony/Bridge/Monolog/Tests/Handler/MailerHandlerTest.php
index b4044d9c870db..397e84259a706 100644
--- a/src/Symfony/Bridge/Monolog/Tests/Handler/MailerHandlerTest.php
+++ b/src/Symfony/Bridge/Monolog/Tests/Handler/MailerHandlerTest.php
@@ -25,7 +25,7 @@
 class MailerHandlerTest extends TestCase
 {
     /** @var MockObject|MailerInterface */
-    private $mailer = null;
+    private $mailer;
 
     protected function setUp(): void
     {
diff --git a/src/Symfony/Bridge/PhpUnit/DeprecationErrorHandler/Configuration.php b/src/Symfony/Bridge/PhpUnit/DeprecationErrorHandler/Configuration.php
index 850630ab7169f..fd2730b0f1d5a 100644
--- a/src/Symfony/Bridge/PhpUnit/DeprecationErrorHandler/Configuration.php
+++ b/src/Symfony/Bridge/PhpUnit/DeprecationErrorHandler/Configuration.php
@@ -59,7 +59,7 @@ class Configuration
     /**
      * @var string|null
      */
-    private $logFile = null;
+    private $logFile;
 
     /**
      * @param int[]       $thresholds       A hash associating groups to thresholds
diff --git a/src/Symfony/Bundle/FrameworkBundle/Tests/Console/Descriptor/TextDescriptorTest.php b/src/Symfony/Bundle/FrameworkBundle/Tests/Console/Descriptor/TextDescriptorTest.php
index 55e410597344a..340defd8e61fa 100644
--- a/src/Symfony/Bundle/FrameworkBundle/Tests/Console/Descriptor/TextDescriptorTest.php
+++ b/src/Symfony/Bundle/FrameworkBundle/Tests/Console/Descriptor/TextDescriptorTest.php
@@ -17,7 +17,7 @@
 
 class TextDescriptorTest extends AbstractDescriptorTestCase
 {
-    private static $fileLinkFormatter = null;
+    private static $fileLinkFormatter;
 
     protected static function getDescriptor()
     {
diff --git a/src/Symfony/Component/BrowserKit/Tests/TestClient.php b/src/Symfony/Component/BrowserKit/Tests/TestClient.php
index bad2d47e22e32..c98c6502981e5 100644
--- a/src/Symfony/Component/BrowserKit/Tests/TestClient.php
+++ b/src/Symfony/Component/BrowserKit/Tests/TestClient.php
@@ -16,8 +16,8 @@
 
 class TestClient extends AbstractBrowser
 {
-    protected $nextResponse = null;
-    protected $nextScript = null;
+    protected $nextResponse;
+    protected $nextScript;
 
     public function setNextResponse(Response $response)
     {
diff --git a/src/Symfony/Component/BrowserKit/Tests/TestHttpClient.php b/src/Symfony/Component/BrowserKit/Tests/TestHttpClient.php
index 184418b7b4477..afb0197c918b9 100644
--- a/src/Symfony/Component/BrowserKit/Tests/TestHttpClient.php
+++ b/src/Symfony/Component/BrowserKit/Tests/TestHttpClient.php
@@ -20,8 +20,8 @@
 
 class TestHttpClient extends HttpBrowser
 {
-    protected $nextResponse = null;
-    protected $nextScript = null;
+    protected $nextResponse;
+    protected $nextScript;
 
     public function __construct(array $server = [], History $history = null, CookieJar $cookieJar = null)
     {
diff --git a/src/Symfony/Component/Config/Tests/ConfigCacheTest.php b/src/Symfony/Component/Config/Tests/ConfigCacheTest.php
index af0d348ddf4da..2c078fe3ff62c 100644
--- a/src/Symfony/Component/Config/Tests/ConfigCacheTest.php
+++ b/src/Symfony/Component/Config/Tests/ConfigCacheTest.php
@@ -18,7 +18,7 @@
 
 class ConfigCacheTest extends TestCase
 {
-    private $cacheFile = null;
+    private $cacheFile;
 
     protected function setUp(): void
     {
diff --git a/src/Symfony/Component/Config/Tests/ResourceCheckerConfigCacheTest.php b/src/Symfony/Component/Config/Tests/ResourceCheckerConfigCacheTest.php
index 8747cbecf435b..f205a72e5561e 100644
--- a/src/Symfony/Component/Config/Tests/ResourceCheckerConfigCacheTest.php
+++ b/src/Symfony/Component/Config/Tests/ResourceCheckerConfigCacheTest.php
@@ -19,7 +19,7 @@
 
 class ResourceCheckerConfigCacheTest extends TestCase
 {
-    private $cacheFile = null;
+    private $cacheFile;
 
     protected function setUp(): void
     {
diff --git a/src/Symfony/Component/Console/Completion/CompletionInput.php b/src/Symfony/Component/Console/Completion/CompletionInput.php
index 3ef8db5d1e07e..800b7235a9fd1 100644
--- a/src/Symfony/Component/Console/Completion/CompletionInput.php
+++ b/src/Symfony/Component/Console/Completion/CompletionInput.php
@@ -34,7 +34,7 @@ final class CompletionInput extends ArgvInput
     private $tokens;
     private $currentIndex;
     private $completionType;
-    private $completionName = null;
+    private $completionName;
     private $completionValue = '';
 
     /**
diff --git a/src/Symfony/Component/Console/Helper/Helper.php b/src/Symfony/Component/Console/Helper/Helper.php
index 51fd11b260f71..77de9daba2ee6 100644
--- a/src/Symfony/Component/Console/Helper/Helper.php
+++ b/src/Symfony/Component/Console/Helper/Helper.php
@@ -21,7 +21,7 @@
  */
 abstract class Helper implements HelperInterface
 {
-    protected $helperSet = null;
+    protected $helperSet;
 
     /**
      * @return void
diff --git a/src/Symfony/Component/Filesystem/Tests/FilesystemTestCase.php b/src/Symfony/Component/Filesystem/Tests/FilesystemTestCase.php
index 725870c69857a..79cb453ed4f28 100644
--- a/src/Symfony/Component/Filesystem/Tests/FilesystemTestCase.php
+++ b/src/Symfony/Component/Filesystem/Tests/FilesystemTestCase.php
@@ -23,22 +23,22 @@ class FilesystemTestCase extends TestCase
     /**
      * @var Filesystem
      */
-    protected $filesystem = null;
+    protected $filesystem;
 
     /**
      * @var string
      */
-    protected $workspace = null;
+    protected $workspace;
 
     /**
      * @var bool|null Flag for hard links on Windows
      */
-    private static $linkOnWindows = null;
+    private static $linkOnWindows;
 
     /**
      * @var bool|null Flag for symbolic links on Windows
      */
-    private static $symlinkOnWindows = null;
+    private static $symlinkOnWindows;
 
     public static function setUpBeforeClass(): void
     {
diff --git a/src/Symfony/Component/Finder/Tests/Iterator/MockSplFileInfo.php b/src/Symfony/Component/Finder/Tests/Iterator/MockSplFileInfo.php
index 2c23df7fd1785..14bb5e4f3090c 100644
--- a/src/Symfony/Component/Finder/Tests/Iterator/MockSplFileInfo.php
+++ b/src/Symfony/Component/Finder/Tests/Iterator/MockSplFileInfo.php
@@ -17,11 +17,11 @@ class MockSplFileInfo extends \SplFileInfo
     public const TYPE_FILE = 2;
     public const TYPE_UNKNOWN = 3;
 
-    private $contents = null;
-    private $mode = null;
-    private $type = null;
-    private $relativePath = null;
-    private $relativePathname = null;
+    private $contents;
+    private $mode;
+    private $type;
+    private $relativePath;
+    private $relativePathname;
 
     public function __construct($param)
     {
diff --git a/src/Symfony/Component/Notifier/Tests/Mailer/DummyMailer.php b/src/Symfony/Component/Notifier/Tests/Mailer/DummyMailer.php
index 3d4ddf62963bb..9c3f96402ed36 100644
--- a/src/Symfony/Component/Notifier/Tests/Mailer/DummyMailer.php
+++ b/src/Symfony/Component/Notifier/Tests/Mailer/DummyMailer.php
@@ -20,7 +20,7 @@
  */
 class DummyMailer implements MailerInterface
 {
-    private $sentMessage = null;
+    private $sentMessage;
 
     public function send(RawMessage $message, Envelope $envelope = null): void
     {
diff --git a/src/Symfony/Component/Process/InputStream.php b/src/Symfony/Component/Process/InputStream.php
index 25f574f703cb8..086f5a9edffc1 100644
--- a/src/Symfony/Component/Process/InputStream.php
+++ b/src/Symfony/Component/Process/InputStream.php
@@ -23,7 +23,7 @@
 class InputStream implements \IteratorAggregate
 {
     /** @var callable|null */
-    private $onEmpty = null;
+    private $onEmpty;
     private $input = [];
     private $open = true;
 
diff --git a/src/Symfony/Component/Routing/Tests/RouterTest.php b/src/Symfony/Component/Routing/Tests/RouterTest.php
index 0d87d26b4f8c3..460fe29eef0cb 100644
--- a/src/Symfony/Component/Routing/Tests/RouterTest.php
+++ b/src/Symfony/Component/Routing/Tests/RouterTest.php
@@ -25,9 +25,9 @@
 
 class RouterTest extends TestCase
 {
-    private $router = null;
+    private $router;
 
-    private $loader = null;
+    private $loader;
 
     private $cacheDir;
 
diff --git a/src/Symfony/Component/Validator/Mapping/Loader/YamlFileLoader.php b/src/Symfony/Component/Validator/Mapping/Loader/YamlFileLoader.php
index ce0326d37949d..2bcaf70877f8c 100644
--- a/src/Symfony/Component/Validator/Mapping/Loader/YamlFileLoader.php
+++ b/src/Symfony/Component/Validator/Mapping/Loader/YamlFileLoader.php
@@ -29,7 +29,7 @@ class YamlFileLoader extends FileLoader
      *
      * @var array
      */
-    protected $classes = null;
+    protected $classes;
 
     public function __construct(string $file)
     {
diff --git a/src/Symfony/Component/Validator/Tests/Mapping/Loader/StaticMethodLoaderTest.php b/src/Symfony/Component/Validator/Tests/Mapping/Loader/StaticMethodLoaderTest.php
index a8788e0dfdf6b..4f12a5a696ee7 100644
--- a/src/Symfony/Component/Validator/Tests/Mapping/Loader/StaticMethodLoaderTest.php
+++ b/src/Symfony/Component/Validator/Tests/Mapping/Loader/StaticMethodLoaderTest.php
@@ -119,7 +119,7 @@ public static function loadMetadata(ClassMetadata $metadata)
 
 class StaticLoaderEntity
 {
-    public static $invokedWith = null;
+    public static $invokedWith;
 
     public static function loadMetadata(ClassMetadata $metadata)
     {