diff --git a/src/ExpressionParser.php b/src/ExpressionParser.php
index 8cd8b194a18..dc4a6015d7b 100644
--- a/src/ExpressionParser.php
+++ b/src/ExpressionParser.php
@@ -568,7 +568,7 @@ public function parseFilterExpression($node)
 
     public function parseFilterExpressionRaw($node)
     {
-        if (func_num_args() > 1) {
+        if (\func_num_args() > 1) {
             trigger_deprecation('twig/twig', '3.12', 'Passing a second argument to "%s()" is deprecated.', __METHOD__);
         }
 
diff --git a/src/Extension/CoreExtension.php b/src/Extension/CoreExtension.php
index 9dc6d6e6a34..ee0a1dbaf47 100644
--- a/src/Extension/CoreExtension.php
+++ b/src/Extension/CoreExtension.php
@@ -348,7 +348,7 @@ public static function cycle($values, $position): mixed
                 throw new RuntimeError('The "cycle" function expects an array or "ArrayAccess" as first argument.');
             }
 
-            if (!\is_countable($values)) {
+            if (!is_countable($values)) {
                 // To be uncommented in 4.0
                 // throw new RuntimeError('The "cycle" function expects a countable sequence as first argument.');
 
diff --git a/src/Node/ImportNode.php b/src/Node/ImportNode.php
index 31acbe9d19d..9a6033f215b 100644
--- a/src/Node/ImportNode.php
+++ b/src/Node/ImportNode.php
@@ -29,10 +29,10 @@ class ImportNode extends Node
      */
     public function __construct(AbstractExpression $expr, AbstractExpression $var, int $lineno, $global = true)
     {
-        if (null === $global || is_string($global)) {
+        if (null === $global || \is_string($global)) {
             trigger_deprecation('twig/twig', '3.12', 'Passing a tag to %s() is deprecated.', __METHOD__);
-            $global = func_num_args() > 4 ? func_get_arg(4) : true;
-        } elseif (!is_bool($global)) {
+            $global = \func_num_args() > 4 ? func_get_arg(4) : true;
+        } elseif (!\is_bool($global)) {
             throw new \TypeError(\sprintf('Argument 4 passed to "%s()" must be a boolean, "%s" given.', __METHOD__, get_debug_type($global)));
         }
 
diff --git a/src/Node/Node.php b/src/Node/Node.php
index 38ebdfa8c68..2ccbcf6101f 100644
--- a/src/Node/Node.php
+++ b/src/Node/Node.php
@@ -47,15 +47,15 @@ public function __construct(array $nodes = [], array $attributes = [], int $line
     {
         foreach ($nodes as $name => $node) {
             if (!$node instanceof self) {
-                throw new \InvalidArgumentException(\sprintf('Using "%s" for the value of node "%s" of "%s" is not supported. You must pass a \Twig\Node\Node instance.', \is_object($node) ? \get_class($node) : (null === $node ? 'null' : \gettype($node)), $name, static::class));
+                throw new \InvalidArgumentException(\sprintf('Using "%s" for the value of node "%s" of "%s" is not supported. You must pass a \Twig\Node\Node instance.', \is_object($node) ? $node::class : (null === $node ? 'null' : \gettype($node)), $name, static::class));
             }
         }
         $this->nodes = $nodes;
         $this->attributes = $attributes;
         $this->lineno = $lineno;
 
-        if (func_num_args() > 3) {
-            trigger_deprecation('twig/twig', '3.12', sprintf('The "tag" constructor argument of the "%s" class is deprecated and ignored (check which TokenParser class set it to "%s"), the tag is now automatically set by the Parser when needed.', static::class, func_get_arg(3) ?: 'null'));
+        if (\func_num_args() > 3) {
+            trigger_deprecation('twig/twig', '3.12', \sprintf('The "tag" constructor argument of the "%s" class is deprecated and ignored (check which TokenParser class set it to "%s"), the tag is now automatically set by the Parser when needed.', static::class, func_get_arg(3) ?: 'null'));
         }
     }
 
diff --git a/src/Template.php b/src/Template.php
index e6bf2486aaf..e8368c5d964 100644
--- a/src/Template.php
+++ b/src/Template.php
@@ -382,7 +382,7 @@ public function render(array $context): string
     }
 
     /**
-     * @return iterable<null|scalar|\Stringable>
+     * @return iterable<scalar|\Stringable|null>
      */
     public function yield(array $context, array $blocks = []): iterable
     {
@@ -412,7 +412,7 @@ public function yield(array $context, array $blocks = []): iterable
     }
 
     /**
-     * @return iterable<null|scalar|\Stringable>
+     * @return iterable<scalar|\Stringable|null>
      */
     public function yieldBlock($name, array $context, array $blocks = [], $useBlocks = true, ?self $templateContext = null): iterable
     {
@@ -472,7 +472,7 @@ public function yieldBlock($name, array $context, array $blocks = [], $useBlocks
      * @param array  $context The context
      * @param array  $blocks  The current set of blocks
      *
-     * @return iterable<null|scalar|\Stringable>
+     * @return iterable<scalar|\Stringable|null>
      */
     public function yieldParentBlock($name, array $context, array $blocks = []): iterable
     {
@@ -491,7 +491,7 @@ public function yieldParentBlock($name, array $context, array $blocks = []): ite
      * @param array $context An array of parameters to pass to the template
      * @param array $blocks  An array of blocks to pass to the template
      *
-     * @return iterable<null|scalar|\Stringable>
+     * @return iterable<scalar|\Stringable|null>
      */
     abstract protected function doDisplay(array $context, array $blocks = []): iterable;
 }
diff --git a/src/Test/NodeTestCase.php b/src/Test/NodeTestCase.php
index 09b16ace793..bac0ea6d036 100644
--- a/src/Test/NodeTestCase.php
+++ b/src/Test/NodeTestCase.php
@@ -118,7 +118,7 @@ final protected static function createAttributeGetter(): string
     final public static function checkDataProvider(): void
     {
         $r = new \ReflectionMethod(static::class, 'getTests');
-        if ($r->getDeclaringClass()->getName() !== self::class) {
+        if (self::class !== $r->getDeclaringClass()->getName()) {
             trigger_deprecation('twig/twig', '3.13', 'Implementing "%s::getTests()" in "%s" is deprecated, implement "provideTests()" instead.', self::class, static::class);
         }
     }
diff --git a/src/TokenParser/TypesTokenParser.php b/src/TokenParser/TypesTokenParser.php
index b579fd0c04e..2172ed26361 100644
--- a/src/TokenParser/TypesTokenParser.php
+++ b/src/TokenParser/TypesTokenParser.php
@@ -62,14 +62,14 @@ private function parseSimpleMappingExpression(TokenStream $stream): array
             $first = false;
 
             $nameToken = $stream->expect(Token::NAME_TYPE);
-            $isOptional = $stream->nextIf(Token::PUNCTUATION_TYPE, '?') !== null;
+            $isOptional = null !== $stream->nextIf(Token::PUNCTUATION_TYPE, '?');
 
             $stream->expect(Token::PUNCTUATION_TYPE, ':', 'A type name must be followed by a colon (:)');
 
             $valueToken = $stream->expect(Token::STRING_TYPE);
 
             $types[$nameToken->getValue()] = [
-                'type'     => $valueToken->getValue(),
+                'type' => $valueToken->getValue(),
                 'optional' => $isOptional,
             ];
         }
diff --git a/tests/EnvironmentTest.php b/tests/EnvironmentTest.php
index ff8dc741bc1..5f8d21bb92a 100644
--- a/tests/EnvironmentTest.php
+++ b/tests/EnvironmentTest.php
@@ -178,7 +178,7 @@ public function testExtensionsAreNotInitializedWhenRenderingACompiledTemplate()
 
         // force compilation
         $twig = new Environment($loader = new ArrayLoader(['index' => '{{ foo }}']), $options);
-        $twig->addExtension($extension = new class extends AbstractExtension {
+        $twig->addExtension($extension = new class() extends AbstractExtension {
             public bool $throw = false;
 
             public function getFilters(): array
diff --git a/tests/Extension/CoreTest.php b/tests/Extension/CoreTest.php
index 2272bb4d03c..e869f96c7b5 100644
--- a/tests/Extension/CoreTest.php
+++ b/tests/Extension/CoreTest.php
@@ -43,7 +43,7 @@ public static function provideCycleCases()
     /**
      * @dataProvider provideCycleInvalidCases
      */
-    public function testCycleFunctionThrowRuntimeError($values,  mixed $position = null)
+    public function testCycleFunctionThrowRuntimeError($values, mixed $position = null)
     {
         $this->expectException(RuntimeError::class);
         CoreExtension::cycle($values, $position ?? 0);
@@ -53,7 +53,8 @@ public static function provideCycleInvalidCases()
     {
         return [
             'empty' => [[]],
-            'non-countable' => [new class extends \ArrayObject{}],
+            'non-countable' => [new class() extends \ArrayObject {
+            }],
         ];
     }
 
diff --git a/tests/Extension/SandboxTest.php b/tests/Extension/SandboxTest.php
index 70052b859c8..d24a06c6720 100644
--- a/tests/Extension/SandboxTest.php
+++ b/tests/Extension/SandboxTest.php
@@ -76,7 +76,7 @@ public function testSandboxForCoreTags(string $tag, string $template)
         $twig = $this->getEnvironment(true, [], self::$templates, []);
 
         $this->expectException(SecurityError::class);
-        $this->expectExceptionMessageMatches(sprintf('/Tag "%s" is not allowed in "index \(string template .+?\)" at line 1/', $tag));
+        $this->expectExceptionMessageMatches(\sprintf('/Tag "%s" is not allowed in "index \(string template .+?\)" at line 1/', $tag));
 
         $twig->createTemplate($template, 'index')->render([]);
     }
@@ -90,7 +90,7 @@ public static function getSandboxedForCoreTagsTests()
         yield ['do', '{% do 1 + 2 %}'];
         yield ['embed', '{% embed "base.twig" %}{% endembed %}'];
         // To be uncommented in 4.0
-        //yield ['extends', '{% extends "base.twig" %}'];
+        // yield ['extends', '{% extends "base.twig" %}'];
         yield ['flush', '{% flush %}'];
         yield ['for', '{% for i in 1..2 %}{% endfor %}'];
         yield ['from', '{% from "macros" import foo %}'];
@@ -101,7 +101,7 @@ public static function getSandboxedForCoreTagsTests()
         yield ['sandbox', '{% sandbox %}{% endsandbox %}'];
         yield ['set', '{% set foo = 1 %}'];
         // To be uncommented in 4.0
-        //yield ['use', '{% use "1_empty" %}'];
+        // yield ['use', '{% use "1_empty" %}'];
         yield ['with', '{% with foo %}{% endwith %}'];
     }
 
@@ -112,7 +112,7 @@ public static function getSandboxedForCoreTagsTests()
      */
     public function testSandboxForExtendsAndUseTags(string $tag, string $template)
     {
-        $this->expectDeprecation(sprintf('Since twig/twig 3.12: The "%s" tag is always allowed in sandboxes, but won\'t be in 4.0, please enable it explicitly in your sandbox policy if needed.', $tag));
+        $this->expectDeprecation(\sprintf('Since twig/twig 3.12: The "%s" tag is always allowed in sandboxes, but won\'t be in 4.0, please enable it explicitly in your sandbox policy if needed.', $tag));
 
         $twig = $this->getEnvironment(true, [], self::$templates, []);
         $twig->createTemplate($template, 'index')->render([]);
diff --git a/tests/Node/Expression/FilterTest.php b/tests/Node/Expression/FilterTest.php
index 1339b07dd46..78bf5066426 100644
--- a/tests/Node/Expression/FilterTest.php
+++ b/tests/Node/Expression/FilterTest.php
@@ -179,7 +179,7 @@ protected static function createEnvironment(): Environment
 
     private static function createExtension(): AbstractExtension
     {
-        return new class extends AbstractExtension {
+        return new class() extends AbstractExtension {
             public function getFilters(): array
             {
                 return [
diff --git a/tests/ParserTest.php b/tests/ParserTest.php
index 4d61c2341d0..dc45fd66d30 100644
--- a/tests/ParserTest.php
+++ b/tests/ParserTest.php
@@ -197,7 +197,7 @@ public function testImplicitMacroArgumentDefaultValues()
         $this->assertNull($argumentNodes->getNode('po')->getAttribute('value'));
 
         $this->assertFalse($argumentNodes->getNode('lo')->hasAttribute('is_implicit'));
-        $this->assertSame(true, $argumentNodes->getNode('lo')->getAttribute('value'));
+        $this->assertTrue($argumentNodes->getNode('lo')->getAttribute('value'));
     }
 
     protected function getParser()
diff --git a/tests/TemplateTest.php b/tests/TemplateTest.php
index 801701af2cc..7018f4afba8 100644
--- a/tests/TemplateTest.php
+++ b/tests/TemplateTest.php
@@ -452,12 +452,12 @@ public function getTemplateName(): string
         return $this->name;
     }
 
-    public function getDebugInfo() : array
+    public function getDebugInfo(): array
     {
         return [];
     }
 
-    public function getSourceContext() : Source
+    public function getSourceContext(): Source
     {
         return new Source('', $this->getTemplateName());
     }
diff --git a/tests/TokenParser/TypesTokenParserTest.php b/tests/TokenParser/TypesTokenParserTest.php
index 57ccb77cb03..85ce6f7a590 100644
--- a/tests/TokenParser/TypesTokenParserTest.php
+++ b/tests/TokenParser/TypesTokenParserTest.php
@@ -35,7 +35,7 @@ public static function getMappingTests(): array
             [
                 '{% types {foo: "bar"} %}',
                 [
-                    'foo' => ['type' => 'bar', 'optional' => false]
+                    'foo' => ['type' => 'bar', 'optional' => false],
                 ],
             ],
 
@@ -43,7 +43,7 @@ public static function getMappingTests(): array
             [
                 '{% types {foo: "bar",} %}',
                 [
-                    'foo' => ['type' => 'bar', 'optional' => false]
+                    'foo' => ['type' => 'bar', 'optional' => false],
                 ],
             ],
 
@@ -51,7 +51,7 @@ public static function getMappingTests(): array
             [
                 '{% types {foo?: "bar"} %}',
                 [
-                    'foo' => ['type' => 'bar', 'optional' => true]
+                    'foo' => ['type' => 'bar', 'optional' => true],
                 ],
             ],
 
@@ -61,7 +61,7 @@ public static function getMappingTests(): array
                 [
                     'foo' => ['type' => 'foo', 'optional' => false],
                     'bar' => ['type' => 'foo', 'optional' => true],
-                    'baz' => ['type' => 'baz', 'optional' => false]
+                    'baz' => ['type' => 'baz', 'optional' => false],
                 ],
             ],
         ];