diff --git a/doc/list.rst b/doc/list.rst
index 44ce877a489..3080f747f6d 100644
--- a/doc/list.rst
+++ b/doc/list.rst
@@ -196,6 +196,10 @@ List of Available Rules
      | Whether there should be a single space after the parenthesis of anonymous class (PSR12) or not.
      | Allowed types: ``bool``
      | Default value: ``false``
+   - | ``inline_constructor_arguments``
+     | Whether constructor argument list in anonymous classes should be single line.
+     | Allowed types: ``bool``
+     | Default value: ``true``
 
 
    Part of rule sets `@PSR12 <./ruleSets/PSR12.rst>`_ `@PSR2 <./ruleSets/PSR2.rst>`_ `@PhpCsFixer <./ruleSets/PhpCsFixer.rst>`_ `@Symfony <./ruleSets/Symfony.rst>`_
diff --git a/doc/ruleSets/PSR12.rst b/doc/ruleSets/PSR12.rst
index 2595a1b0299..a8a6722c2ef 100644
--- a/doc/ruleSets/PSR12.rst
+++ b/doc/ruleSets/PSR12.rst
@@ -14,7 +14,7 @@ Rules
   ``['allow_single_line_anonymous_class_with_empty_body' => true]``
 - `class_definition <./../rules/class_notation/class_definition.rst>`_
   config:
-  ``['space_before_parenthesis' => true]``
+  ``['inline_constructor_arguments' => false, 'space_before_parenthesis' => true]``
 - `compact_nullable_typehint <./../rules/whitespace/compact_nullable_typehint.rst>`_
 - `declare_equal_normalize <./../rules/language_construct/declare_equal_normalize.rst>`_
 - `lowercase_cast <./../rules/cast_notation/lowercase_cast.rst>`_
diff --git a/doc/rules/class_notation/class_definition.rst b/doc/rules/class_notation/class_definition.rst
index 58dba01f6b2..cbf0d0ababe 100644
--- a/doc/rules/class_notation/class_definition.rst
+++ b/doc/rules/class_notation/class_definition.rst
@@ -45,6 +45,15 @@ Allowed types: ``bool``
 
 Default value: ``false``
 
+``inline_constructor_arguments``
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Whether constructor argument list in anonymous classes should be single line.
+
+Allowed types: ``bool``
+
+Default value: ``true``
+
 Examples
 --------
 
@@ -142,6 +151,22 @@ With configuration: ``['space_before_parenthesis' => true]``.
    -$foo = new class(){};
    +$foo = new class () {};
 
+Example #6
+~~~~~~~~~~
+
+With configuration: ``['inline_constructor_arguments' => true]``.
+
+.. code-block:: diff
+
+   --- Original
+   +++ New
+    <?php
+   -$foo = new class(
+   -    $bar,
+   -    $baz
+   -) {};
+   +$foo = new class($bar, $baz) {};
+
 Rule sets
 ---------
 
@@ -150,7 +175,7 @@ The rule is part of the following rule sets:
 @PSR12
   Using the `@PSR12 <./../../ruleSets/PSR12.rst>`_ rule set will enable the ``class_definition`` rule with the config below:
 
-  ``['space_before_parenthesis' => true]``
+  ``['inline_constructor_arguments' => false, 'space_before_parenthesis' => true]``
 
 @PSR2
   Using the `@PSR2 <./../../ruleSets/PSR2.rst>`_ rule set will enable the ``class_definition`` rule with the default config.
diff --git a/src/Fixer/ClassNotation/ClassDefinitionFixer.php b/src/Fixer/ClassNotation/ClassDefinitionFixer.php
index 6ff89b85df1..9b1394b4128 100644
--- a/src/Fixer/ClassNotation/ClassDefinitionFixer.php
+++ b/src/Fixer/ClassNotation/ClassDefinitionFixer.php
@@ -93,6 +93,10 @@ interface Bar extends
 ',
                     ['space_before_parenthesis' => true]
                 ),
+                new CodeSample(
+                    "<?php\n\$foo = new class(\n    \$bar,\n    \$baz\n) {};\n",
+                    ['inline_constructor_arguments' => true]
+                ),
             ]
         );
     }
@@ -151,6 +155,10 @@ protected function createConfigurationDefinition(): FixerConfigurationResolverIn
                 ->setAllowedTypes(['bool'])
                 ->setDefault(false)
                 ->getOption(),
+            (new FixerOptionBuilder('inline_constructor_arguments', 'Whether constructor argument list in anonymous classes should be single line.'))
+                ->setAllowedTypes(['bool'])
+                ->setDefault(true)
+                ->getOption(),
         ]);
     }
 
@@ -193,6 +201,18 @@ private function fixClassyDefinition(Tokens $tokens, int $classyIndex): void
             $end = $tokens->getPrevNonWhitespace($classDefInfo['open']);
         }
 
+        if ($classDefInfo['anonymousClass'] && !$this->configuration['inline_constructor_arguments']) {
+            if (!$tokens[$end]->equals(')')) { // anonymous class with `extends` and/or `implements`
+                $start = $tokens->getPrevMeaningfulToken($end);
+                $this->makeClassyDefinitionSingleLine($tokens, $start, $end);
+                $end = $start;
+            }
+
+            if ($tokens[$end]->equals(')')) { // skip constructor arguments of anonymous class
+                $end = $tokens->findBlockStart(Tokens::BLOCK_TYPE_PARENTHESIS_BRACE, $end);
+            }
+        }
+
         // 4.1 The extends and implements keywords MUST be declared on the same line as the class name.
         $this->makeClassyDefinitionSingleLine($tokens, $classDefInfo['start'], $end);
     }
diff --git a/src/Fixer/FunctionNotation/MethodArgumentSpaceFixer.php b/src/Fixer/FunctionNotation/MethodArgumentSpaceFixer.php
index d09ebf4255b..2579e046e5c 100644
--- a/src/Fixer/FunctionNotation/MethodArgumentSpaceFixer.php
+++ b/src/Fixer/FunctionNotation/MethodArgumentSpaceFixer.php
@@ -135,7 +135,7 @@ public function getPriority(): int
      */
     protected function applyFix(\SplFileInfo $file, Tokens $tokens): void
     {
-        $expectedTokens = [T_LIST, T_FUNCTION, CT::T_USE_LAMBDA, T_FN];
+        $expectedTokens = [T_LIST, T_FUNCTION, CT::T_USE_LAMBDA, T_FN, T_CLASS];
 
         for ($index = $tokens->count() - 1; $index > 0; --$index) {
             $token = $tokens[$index];
diff --git a/src/RuleSet/Sets/PSR12Set.php b/src/RuleSet/Sets/PSR12Set.php
index 9a8e4c1bf1e..dd04f4c1e3c 100644
--- a/src/RuleSet/Sets/PSR12Set.php
+++ b/src/RuleSet/Sets/PSR12Set.php
@@ -29,7 +29,10 @@ public function getRules(): array
             'braces' => [
                 'allow_single_line_anonymous_class_with_empty_body' => true,
             ],
-            'class_definition' => ['space_before_parenthesis' => true], // defined in PSR12 ¶8. Anonymous Classes
+            'class_definition' => [
+                'inline_constructor_arguments' => false, // handled by method_argument_space fixer
+                'space_before_parenthesis' => true, // defined in PSR12 ¶8. Anonymous Classes
+            ],
             'compact_nullable_typehint' => true,
             'declare_equal_normalize' => true,
             'lowercase_cast' => true,
diff --git a/tests/Fixer/ClassNotation/ClassDefinitionFixerTest.php b/tests/Fixer/ClassNotation/ClassDefinitionFixerTest.php
index 8f8db669a92..035c8ff465b 100644
--- a/tests/Fixer/ClassNotation/ClassDefinitionFixerTest.php
+++ b/tests/Fixer/ClassNotation/ClassDefinitionFixerTest.php
@@ -34,6 +34,7 @@ public function testConfigureDefaultToFalse(): void
             'single_item_single_line' => false,
             'single_line' => false,
             'space_before_parenthesis' => false,
+            'inline_constructor_arguments' => true,
         ];
 
         $fixer = new ClassDefinitionFixer();
@@ -97,7 +98,7 @@ public function testInvalidConfigurationKey(): void
     {
         $this->expectException(InvalidFixerConfigurationException::class);
         $this->expectExceptionMessageMatches(
-            '/^\[class_definition\] Invalid configuration: The option "a" does not exist\. Defined options are: "multi_line_extends_each_single_line", "single_item_single_line", "single_line", "space_before_parenthesis"\.$/'
+            '/^\[class_definition\] Invalid configuration: The option "a" does not exist\. Defined options are: "inline_constructor_arguments", "multi_line_extends_each_single_line", "single_item_single_line", "single_line", "space_before_parenthesis"\.$/'
         );
 
         $fixer = new ClassDefinitionFixer();
@@ -148,10 +149,30 @@ public function provideAnonymousClassesCases(): array
                 '<?php $a = new class() {};',
                 "<?php \$a = new\n class  (  ){};",
             ],
+            [
+                '<?php $a = new class(  ) {};',
+                "<?php \$a = new\n class  (  ){};",
+                ['inline_constructor_arguments' => false],
+            ],
+            [
+                '<?php $a = new class implements Foo {};',
+                "<?php \$a = new\n class    implements Foo {};",
+                ['inline_constructor_arguments' => false],
+            ],
+            [
+                '<?php $a = new class( $this->foo() , bar ( $a) ) {};',
+                "<?php \$a = new\n class  ( \$this->foo() , bar ( \$a) ){};",
+                ['inline_constructor_arguments' => false],
+            ],
             [
                 '<?php $a = new class(10, 1, /**/ 2) {};',
                 '<?php $a = new class(  10, 1,/**/2  ){};',
             ],
+            [
+                '<?php $a = new class(  10, 1,/**/2  ) {};',
+                '<?php $a = new class(  10, 1,/**/2  ){};',
+                ['inline_constructor_arguments' => false],
+            ],
             [
                 '<?php $a = new class(2) {};',
                 '<?php $a = new    class(2){};',
@@ -160,6 +181,21 @@ public function provideAnonymousClassesCases(): array
                 '<?php $a = new class($this->prop) {};',
                 '<?php $a = new class(   $this->prop   ){};',
             ],
+            [
+                '<?php $a = new class(   $this->prop   ) {};',
+                '<?php $a = new class(   $this->prop   ){};',
+                ['inline_constructor_arguments' => false],
+            ],
+            [
+                "<?php \$a = new class(\n\t\$a,\n\t\$b,\n\t\$c,\n\t\$d) implements A, B {};",
+                "<?php \$a = new class(\n\t\$a,\n\t\$b,\n\t\$c,\n\t\$d) implements  A, \t B{};",
+                ['inline_constructor_arguments' => false],
+            ],
+            [
+                "<?php \$a = new class(\n\t\$a,\n\t\$b,\n\t\$c,\n\t\$d) implements A, B {};",
+                "<?php \$a = new   class  (\n\t\$a,\n\t\$b,\n\t\$c,\n\t\$d)    implements  A, \t B{};",
+                ['inline_constructor_arguments' => false],
+            ],
             [
                 '<?php $a = new class($this->prop, $v[3], 4) {};',
                 '<?php $a = new class(   $this->prop,$v[3],   4)         {};',
@@ -172,7 +208,7 @@ public function provideAnonymousClassesCases(): array
     \Serializable
 {};',
                 '<?php
-$instance = new class extends \Foo implements
+$instance = new class   extends \Foo  implements
 \ArrayAccess,\Countable,\Serializable{};',
             ],
             'PSR-12 Implements Parenthesis on the next line.' => [
@@ -269,6 +305,11 @@ class#
                 '<?php $z = new class   ()  {};',
                 ['space_before_parenthesis' => true],
             ],
+            'space_before_parenthesis and inline_constructor_arguments' => [
+                '<?php $z = new class ( static::foo($this->bar())  ,baz() ) {};',
+                '<?php $z = new class   ( static::foo($this->bar())  ,baz() )  {};',
+                ['space_before_parenthesis' => true, 'inline_constructor_arguments' => false],
+            ],
         ];
     }
 
diff --git a/tests/Fixer/FunctionNotation/MethodArgumentSpaceFixerTest.php b/tests/Fixer/FunctionNotation/MethodArgumentSpaceFixerTest.php
index 3fa3e5a5497..fc3de20fdaf 100644
--- a/tests/Fixer/FunctionNotation/MethodArgumentSpaceFixerTest.php
+++ b/tests/Fixer/FunctionNotation/MethodArgumentSpaceFixerTest.php
@@ -169,6 +169,32 @@ public function provideFixCases(): array
                 '<?php xyz($a=10,$b=20 ,         $this->foo() ,$c=30);',
                 ['keep_multiple_spaces_after_comma' => true],
             ],
+            'test named class constructor call' => [
+                '<?php new Foo($a=10, $b=20, $this->foo(), $c=30);',
+                '<?php new Foo($a=10,$b=20 ,$this->foo() ,$c=30);',
+            ],
+            'test named class constructor call with multiple spaces' => [
+                '<?php new Foo($a=10, $b=20, $c=30);',
+                '<?php new Foo($a=10 , $b=20 ,          $c=30);',
+            ],
+            'test named class constructor call with multiple spaces (kmsac)' => [
+                '<?php new Foo($a=10, $b=20,          $c=30);',
+                '<?php new Foo($a=10 , $b=20 ,          $c=30);',
+                ['keep_multiple_spaces_after_comma' => true],
+            ],
+            'test anonymous class constructor call' => [
+                '<?php new class ($a=10, $b=20, $this->foo(), $c=30) {};',
+                '<?php new class ($a=10,$b=20 ,$this->foo() ,$c=30) {};',
+            ],
+            'test anonymous class constructor call with multiple spaces' => [
+                '<?php new class ($a=10, $b=20, $c=30) extends Foo {};',
+                '<?php new class ($a=10 , $b=20 ,          $c=30) extends Foo {};',
+            ],
+            'test anonymous class constructor call with multiple spaces (kmsac)' => [
+                '<?php new class ($a=10, $b=20,          $c=30) {};',
+                '<?php new class ($a=10 , $b=20 ,          $c=30) {};',
+                ['keep_multiple_spaces_after_comma' => true],
+            ],
             'test receiving data in list context with omitted values' => [
                 '<?php list($a, $b, , , $c) = foo();',
                 '<?php list($a, $b,, ,$c) = foo();',
@@ -228,6 +254,20 @@ public function provideFixCases(): array
                 );
                 }',
             ],
+            'multi line anonymous class constructor call' => [
+                '<?php if (1) {
+                new class (
+                    $a=10,
+                    $b=20,
+                    $c=30
+                ) {};
+                }',
+                '<?php if (1) {
+                new class (
+                    $a=10 ,
+                $b=20,$c=30) {};
+                }',
+            ],
             'skip arrays but replace arg methods' => [
                 '<?php fnc(1, array(2, func2(6, 7) ,4), 5);',
                 '<?php fnc(1,array(2, func2(6,    7) ,4),    5);',
@@ -779,6 +819,33 @@ private function foo2(
         $c
     ) {}
 }
+INPUT
+                ,
+                ['on_multiline' => 'ensure_single_line'],
+            ],
+            'ensure_single_line_methods_in_anonymous_class' => [
+                <<<'EXPECTED'
+<?php
+new class {
+    public static function foo1($a, $b, $c) {}
+    private function foo2($a, $b, $c) {}
+};
+EXPECTED
+                ,
+                <<<'INPUT'
+<?php
+new class {
+    public static function foo1(
+        $a,
+        $b,
+        $c
+    ) {}
+    private function foo2(
+        $a,
+        $b,
+        $c
+    ) {}
+};
 INPUT
                 ,
                 ['on_multiline' => 'ensure_single_line'],