diff --git a/src/Symfony/Bridge/PhpUnit/ClockMock.php b/src/Symfony/Bridge/PhpUnit/ClockMock.php
index 6876e3389f..2cc834cd4f 100644
--- a/src/Symfony/Bridge/PhpUnit/ClockMock.php
+++ b/src/Symfony/Bridge/PhpUnit/ClockMock.php
@@ -94,7 +94,7 @@ class ClockMock
     {
         $self = \get_called_class();
 
-        $mockedNs = array(substr($class, 0, strrpos($class, '\\')));
+        $mockedNs = [substr($class, 0, strrpos($class, '\\'))];
         if (0 < strpos($class, '\\Tests\\')) {
             $ns = str_replace('\\Tests\\', '\\', $class);
             $mockedNs[] = substr($ns, 0, strrpos($ns, '\\'));
diff --git a/src/Symfony/Bridge/PhpUnit/DnsMock.php b/src/Symfony/Bridge/PhpUnit/DnsMock.php
index 790cfa91af..a58bf2efcd 100644
--- a/src/Symfony/Bridge/PhpUnit/DnsMock.php
+++ b/src/Symfony/Bridge/PhpUnit/DnsMock.php
@@ -16,8 +16,8 @@ namespace Symfony\Bridge\PhpUnit;
  */
 class DnsMock
 {
-    private static $hosts = array();
-    private static $dnsTypes = array(
+    private static $hosts = [];
+    private static $dnsTypes = [
         'A' => DNS_A,
         'MX' => DNS_MX,
         'NS' => DNS_NS,
@@ -30,7 +30,7 @@ class DnsMock
         'NAPTR' => DNS_NAPTR,
         'TXT' => DNS_TXT,
         'HINFO' => DNS_HINFO,
-    );
+    ];
 
     /**
      * Configures the mock values for DNS queries.
@@ -68,7 +68,7 @@ class DnsMock
         if (!self::$hosts) {
             return \getmxrr($hostname, $mxhosts, $weight);
         }
-        $mxhosts = $weight = array();
+        $mxhosts = $weight = [];
 
         if (isset(self::$hosts[$hostname])) {
             foreach (self::$hosts[$hostname] as $record) {
@@ -125,7 +125,7 @@ class DnsMock
         $ips = false;
 
         if (isset(self::$hosts[$hostname])) {
-            $ips = array();
+            $ips = [];
 
             foreach (self::$hosts[$hostname] as $record) {
                 if ('A' === $record['type']) {
@@ -149,11 +149,11 @@ class DnsMock
             if (DNS_ANY === $type) {
                 $type = DNS_ALL;
             }
-            $records = array();
+            $records = [];
 
             foreach (self::$hosts[$hostname] as $record) {
                 if (isset(self::$dnsTypes[$record['type']]) && (self::$dnsTypes[$record['type']] & $type)) {
-                    $records[] = array_merge(array('host' => $hostname, 'class' => 'IN', 'ttl' => 1, 'type' => $record['type']), $record);
+                    $records[] = array_merge(['host' => $hostname, 'class' => 'IN', 'ttl' => 1, 'type' => $record['type']], $record);
                 }
             }
         }
@@ -165,7 +165,7 @@ class DnsMock
     {
         $self = \get_called_class();
 
-        $mockedNs = array(substr($class, 0, strrpos($class, '\\')));
+        $mockedNs = [substr($class, 0, strrpos($class, '\\'))];
         if (0 < strpos($class, '\\Tests\\')) {
             $ns = str_replace('\\Tests\\', '\\', $class);
             $mockedNs[] = substr($ns, 0, strrpos($ns, '\\'));
diff --git a/src/Symfony/Bridge/PhpUnit/Legacy/CommandForV5.php b/src/Symfony/Bridge/PhpUnit/Legacy/CommandForV5.php
index ed4128482f..2ce390df38 100644
--- a/src/Symfony/Bridge/PhpUnit/Legacy/CommandForV5.php
+++ b/src/Symfony/Bridge/PhpUnit/Legacy/CommandForV5.php
@@ -23,7 +23,7 @@ class CommandForV5 extends \PHPUnit_TextUI_Command
      */
     protected function createRunner()
     {
-        $this->arguments['listeners'] = isset($this->arguments['listeners']) ? $this->arguments['listeners'] : array();
+        $this->arguments['listeners'] = isset($this->arguments['listeners']) ? $this->arguments['listeners'] : [];
 
         $registeredLocally = false;
 
diff --git a/src/Symfony/Bridge/PhpUnit/Legacy/CoverageListenerTrait.php b/src/Symfony/Bridge/PhpUnit/Legacy/CoverageListenerTrait.php
index 6c42d3bf26..7a64ed0d91 100644
--- a/src/Symfony/Bridge/PhpUnit/Legacy/CoverageListenerTrait.php
+++ b/src/Symfony/Bridge/PhpUnit/Legacy/CoverageListenerTrait.php
@@ -32,7 +32,7 @@ class CoverageListenerTrait
     {
         $this->sutFqcnResolver = $sutFqcnResolver;
         $this->warningOnSutNotFound = $warningOnSutNotFound;
-        $this->warnings = array();
+        $this->warnings = [];
     }
 
     public function startTest($test)
@@ -43,7 +43,7 @@ class CoverageListenerTrait
 
         $annotations = $test->getAnnotations();
 
-        $ignoredAnnotations = array('covers', 'coversDefaultClass', 'coversNothing');
+        $ignoredAnnotations = ['covers', 'coversDefaultClass', 'coversNothing'];
 
         foreach ($ignoredAnnotations as $annotation) {
             if (isset($annotations['class'][$annotation]) || isset($annotations['method'][$annotation])) {
@@ -70,11 +70,11 @@ class CoverageListenerTrait
         $r->setAccessible(true);
 
         $cache = $r->getValue();
-        $cache = array_replace_recursive($cache, array(
-            \get_class($test) => array(
-                'covers' => \is_array($sutFqcn) ? $sutFqcn : array($sutFqcn),
-            ),
-        ));
+        $cache = array_replace_recursive($cache, [
+            \get_class($test) => [
+                'covers' => \is_array($sutFqcn) ? $sutFqcn : [$sutFqcn],
+            ],
+        ]);
         $r->setValue(Test::class, $cache);
     }
 
diff --git a/src/Symfony/Bridge/PhpUnit/Legacy/SymfonyTestsListenerForV5.php b/src/Symfony/Bridge/PhpUnit/Legacy/SymfonyTestsListenerForV5.php
index a760d126ca..9b646dca8d 100644
--- a/src/Symfony/Bridge/PhpUnit/Legacy/SymfonyTestsListenerForV5.php
+++ b/src/Symfony/Bridge/PhpUnit/Legacy/SymfonyTestsListenerForV5.php
@@ -22,7 +22,7 @@ class SymfonyTestsListenerForV5 extends \PHPUnit_Framework_BaseTestListener
 {
     private $trait;
 
-    public function __construct(array $mockedNamespaces = array())
+    public function __construct(array $mockedNamespaces = [])
     {
         $this->trait = new SymfonyTestsListenerTrait($mockedNamespaces);
     }
diff --git a/src/Symfony/Bridge/PhpUnit/Legacy/SymfonyTestsListenerForV6.php b/src/Symfony/Bridge/PhpUnit/Legacy/SymfonyTestsListenerForV6.php
index bcab4be4ee..8f2f6b5a7e 100644
--- a/src/Symfony/Bridge/PhpUnit/Legacy/SymfonyTestsListenerForV6.php
+++ b/src/Symfony/Bridge/PhpUnit/Legacy/SymfonyTestsListenerForV6.php
@@ -14,7 +14,6 @@ namespace Symfony\Bridge\PhpUnit\Legacy;
 use PHPUnit\Framework\BaseTestListener;
 use PHPUnit\Framework\Test;
 use PHPUnit\Framework\TestSuite;
-use PHPUnit\Framework\Warning;
 
 /**
  * Collects and replays skipped tests.
@@ -27,7 +26,7 @@ class SymfonyTestsListenerForV6 extends BaseTestListener
 {
     private $trait;
 
-    public function __construct(array $mockedNamespaces = array())
+    public function __construct(array $mockedNamespaces = [])
     {
         $this->trait = new SymfonyTestsListenerTrait($mockedNamespaces);
     }
diff --git a/src/Symfony/Bridge/PhpUnit/Legacy/SymfonyTestsListenerForV7.php b/src/Symfony/Bridge/PhpUnit/Legacy/SymfonyTestsListenerForV7.php
index 0c2069c66b..15f60a453f 100644
--- a/src/Symfony/Bridge/PhpUnit/Legacy/SymfonyTestsListenerForV7.php
+++ b/src/Symfony/Bridge/PhpUnit/Legacy/SymfonyTestsListenerForV7.php
@@ -15,7 +15,6 @@ use PHPUnit\Framework\Test;
 use PHPUnit\Framework\TestListener;
 use PHPUnit\Framework\TestListenerDefaultImplementation;
 use PHPUnit\Framework\TestSuite;
-use PHPUnit\Framework\Warning;
 
 /**
  * Collects and replays skipped tests.
@@ -30,7 +29,7 @@ class SymfonyTestsListenerForV7 implements TestListener
 
     private $trait;
 
-    public function __construct(array $mockedNamespaces = array())
+    public function __construct(array $mockedNamespaces = [])
     {
         $this->trait = new SymfonyTestsListenerTrait($mockedNamespaces);
     }
diff --git a/src/Symfony/Bridge/PhpUnit/Legacy/SymfonyTestsListenerTrait.php b/src/Symfony/Bridge/PhpUnit/Legacy/SymfonyTestsListenerTrait.php
index 05e886506d..1e030825e6 100644
--- a/src/Symfony/Bridge/PhpUnit/Legacy/SymfonyTestsListenerTrait.php
+++ b/src/Symfony/Bridge/PhpUnit/Legacy/SymfonyTestsListenerTrait.php
@@ -35,10 +35,10 @@ class SymfonyTestsListenerTrait
     private static $globallyEnabled = false;
     private $state = -1;
     private $skippedFile = false;
-    private $wasSkipped = array();
-    private $isSkipped = array();
-    private $expectedDeprecations = array();
-    private $gatheredDeprecations = array();
+    private $wasSkipped = [];
+    private $isSkipped = [];
+    private $expectedDeprecations = [];
+    private $gatheredDeprecations = [];
     private $previousErrorHandler;
     private $error;
     private $runsInSeparateProcess = false;
@@ -46,7 +46,7 @@ class SymfonyTestsListenerTrait
     /**
      * @param array $mockedNamespaces List of namespaces, indexed by mocked features (time-sensitive or dns-sensitive)
      */
-    public function __construct(array $mockedNamespaces = array())
+    public function __construct(array $mockedNamespaces = [])
     {
         Blacklist::$blacklistedClassNames['\Symfony\Bridge\PhpUnit\Legacy\SymfonyTestsListenerTrait'] = 2;
 
@@ -54,7 +54,7 @@ class SymfonyTestsListenerTrait
 
         foreach ($mockedNamespaces as $type => $namespaces) {
             if (!\is_array($namespaces)) {
-                $namespaces = array($namespaces);
+                $namespaces = [$namespaces];
             }
             if ('time-sensitive' === $type) {
                 foreach ($namespaces as $ns) {
@@ -140,11 +140,11 @@ class SymfonyTestsListenerTrait
 
                     if (!$this->wasSkipped = require $this->skippedFile) {
                         echo "All tests already ran successfully.\n";
-                        $suite->setTests(array());
+                        $suite->setTests([]);
                     }
                 }
             }
-            $testSuites = array($suite);
+            $testSuites = [$suite];
             for ($i = 0; isset($testSuites[$i]); ++$i) {
                 foreach ($testSuites[$i]->tests() as $test) {
                     if ($test instanceof TestSuite) {
@@ -163,7 +163,7 @@ class SymfonyTestsListenerTrait
                 }
             }
         } elseif (2 === $this->state) {
-            $skipped = array();
+            $skipped = [];
             foreach ($suite->tests() as $test) {
                 if (!($test instanceof \PHPUnit\Framework\TestCase || $test instanceof TestCase)
                     || isset($this->wasSkipped[$suiteName]['*'])
@@ -228,7 +228,7 @@ class SymfonyTestsListenerTrait
                 $test->getTestResultObject()->beStrictAboutTestsThatDoNotTestAnything(false);
 
                 $this->expectedDeprecations = $annotations['method']['expectedDeprecation'];
-                $this->previousErrorHandler = set_error_handler(array($this, 'handleError'));
+                $this->previousErrorHandler = set_error_handler([$this, 'handleError']);
             }
         }
     }
@@ -251,8 +251,8 @@ class SymfonyTestsListenerTrait
             $deprecations = file_get_contents($this->runsInSeparateProcess);
             unlink($this->runsInSeparateProcess);
             putenv('SYMFONY_DEPRECATIONS_SERIALIZE');
-            foreach ($deprecations ? unserialize($deprecations) : array() as $deprecation) {
-                $error = serialize(array('deprecation' => $deprecation[1], 'class' => $className, 'method' => $test->getName(false), 'triggering_file' => isset($deprecation[2]) ? $deprecation[2] : null));
+            foreach ($deprecations ? unserialize($deprecations) : [] as $deprecation) {
+                $error = serialize(['deprecation' => $deprecation[1], 'class' => $className, 'method' => $test->getName(false), 'triggering_file' => isset($deprecation[2]) ? $deprecation[2] : null]);
                 if ($deprecation[0]) {
                     // unsilenced on purpose
                     trigger_error($error, E_USER_DEPRECATED);
@@ -264,13 +264,13 @@ class SymfonyTestsListenerTrait
         }
 
         if ($this->expectedDeprecations) {
-            if (!\in_array($test->getStatus(), array(BaseTestRunner::STATUS_SKIPPED, BaseTestRunner::STATUS_INCOMPLETE), true)) {
+            if (!\in_array($test->getStatus(), [BaseTestRunner::STATUS_SKIPPED, BaseTestRunner::STATUS_INCOMPLETE], true)) {
                 $test->addToAssertionCount(\count($this->expectedDeprecations));
             }
 
             restore_error_handler();
 
-            if (!$errored && !\in_array($test->getStatus(), array(BaseTestRunner::STATUS_SKIPPED, BaseTestRunner::STATUS_INCOMPLETE, BaseTestRunner::STATUS_FAILURE, BaseTestRunner::STATUS_ERROR), true)) {
+            if (!$errored && !\in_array($test->getStatus(), [BaseTestRunner::STATUS_SKIPPED, BaseTestRunner::STATUS_INCOMPLETE, BaseTestRunner::STATUS_FAILURE, BaseTestRunner::STATUS_ERROR], true)) {
                 try {
                     $prefix = "@expectedDeprecation:\n";
                     $test->assertStringMatchesFormat($prefix.'%A  '.implode("\n%A  ", $this->expectedDeprecations)."\n%A", $prefix.'  '.implode("\n  ", $this->gatheredDeprecations)."\n");
@@ -279,7 +279,7 @@ class SymfonyTestsListenerTrait
                 }
             }
 
-            $this->expectedDeprecations = $this->gatheredDeprecations = array();
+            $this->expectedDeprecations = $this->gatheredDeprecations = [];
             $this->previousErrorHandler = null;
         }
         if (!$this->runsInSeparateProcess && -2 < $this->state && ($test instanceof \PHPUnit\Framework\TestCase || $test instanceof TestCase)) {
@@ -287,12 +287,12 @@ class SymfonyTestsListenerTrait
                 ClockMock::withClockMock(false);
             }
             if (\in_array('dns-sensitive', $groups, true)) {
-                DnsMock::withMockedHosts(array());
+                DnsMock::withMockedHosts([]);
             }
         }
     }
 
-    public function handleError($type, $msg, $file, $line, $context = array())
+    public function handleError($type, $msg, $file, $line, $context = [])
     {
         if (E_USER_DEPRECATED !== $type && E_DEPRECATED !== $type) {
             $h = $this->previousErrorHandler;
diff --git a/src/Symfony/Bridge/PhpUnit/Tests/DeprecationErrorHandler/DeprecationTest.php b/src/Symfony/Bridge/PhpUnit/Tests/DeprecationErrorHandler/DeprecationTest.php
index f4b418961c..fd6d059e44 100644
--- a/src/Symfony/Bridge/PhpUnit/Tests/DeprecationErrorHandler/DeprecationTest.php
+++ b/src/Symfony/Bridge/PhpUnit/Tests/DeprecationErrorHandler/DeprecationTest.php
@@ -11,7 +11,6 @@
 
 namespace Symfony\Bridge\PhpUnit\Tests\DeprecationErrorHandler;
 
-use Composer\Autoload\ClassLoader;
 use PHPUnit\Framework\TestCase;
 use Symfony\Bridge\PhpUnit\DeprecationErrorHandler;
 use Symfony\Bridge\PhpUnit\DeprecationErrorHandler\Deprecation;
@@ -46,7 +45,6 @@ class DeprecationTest extends TestCase
         touch($vendorDir.'/myfakevendor/myfakepackage1/MyFakeFile2.php');
         touch($vendorDir.'/myfakevendor/myfakepackage2/MyFakeFile.php');
 
-
         return self::$vendorDir;
     }
 
@@ -106,12 +104,12 @@ class DeprecationTest extends TestCase
         yield 'not from phpunit, and not a whitelisted message' => [
             false,
             \My\Source\Code::class,
-            'Self deprecating humor is deprecated by itself'
+            'Self deprecating humor is deprecated by itself',
         ];
         yield 'from phpunit, but not a whitelisted message' => [
             false,
             \PHPUnit\Random\Piece\Of\Code::class,
-            'Self deprecating humor is deprecated by itself'
+            'Self deprecating humor is deprecated by itself',
         ];
         yield 'whitelisted message, but not from phpunit' => [
             false,
@@ -146,7 +144,7 @@ class DeprecationTest extends TestCase
                 ['file' => 'should_not_matter.php'],
                 ['file' => 'should_not_matter_either.php'],
             ],
-            'random_path' . \DIRECTORY_SEPARATOR . 'vendor' . \DIRECTORY_SEPARATOR . 'phpunit' . \DIRECTORY_SEPARATOR . 'whatever.php'
+            'random_path'.\DIRECTORY_SEPARATOR.'vendor'.\DIRECTORY_SEPARATOR.'phpunit'.\DIRECTORY_SEPARATOR.'whatever.php'
         );
         $this->assertTrue($deprecation->isMuted());
     }
diff --git a/src/Symfony/Component/Workflow/Event/Event.php b/src/Symfony/Component/Workflow/Event/Event.php
index a0bb4c5176..cda6e170be 100644
--- a/src/Symfony/Component/Workflow/Event/Event.php
+++ b/src/Symfony/Component/Workflow/Event/Event.php
@@ -60,7 +60,7 @@ class Event extends BaseEvent
         return $this->workflow->getName();
     }
 
-    public function getMetadata(string $key, object $subject)
+    public function getMetadata(string $key, $subject)
     {
         return $this->workflow->getMetadataStore()->getMetadata($key, $subject);
     }