diff --git a/composer/Plugin/Scaffold/Plugin.php b/composer/Plugin/Scaffold/Plugin.php
index 8fe6961424c..3de043a36ef 100644
--- a/composer/Plugin/Scaffold/Plugin.php
+++ b/composer/Plugin/Scaffold/Plugin.php
@@ -47,7 +47,7 @@ class Plugin implements PluginInterface, EventSubscriberInterface, Capable {
   /**
    * Record whether the 'require' command was called.
    *
-   * @param bool
+   * @var bool
    */
   protected $requireWasCalled;
 
diff --git a/core/includes/bootstrap.inc b/core/includes/bootstrap.inc
index 881d695b4ae..3554cd4cc1e 100644
--- a/core/includes/bootstrap.inc
+++ b/core/includes/bootstrap.inc
@@ -441,7 +441,7 @@ function drupal_static_reset($name = NULL) {
  *
  * @param callable $callback
  *   The shutdown function to register.
- * @param ...
+ * @param ...$args
  *   Additional arguments to pass to the shutdown function.
  *
  * @return array
@@ -450,7 +450,7 @@ function drupal_static_reset($name = NULL) {
  * @see register_shutdown_function()
  * @ingroup php_wrappers
  */
-function &drupal_register_shutdown_function($callback = NULL) {
+function &drupal_register_shutdown_function($callback = NULL, ...$args) {
   // We cannot use drupal_static() here because the static cache is reset during
   // batch processing, which breaks batch handling.
   static $callbacks = [];
@@ -460,9 +460,6 @@ function &drupal_register_shutdown_function($callback = NULL) {
     if (empty($callbacks)) {
       register_shutdown_function('_drupal_shutdown_function');
     }
-    $args = func_get_args();
-    // Remove $callback from the arguments.
-    unset($args[0]);
     // Save callback and arguments
     $callbacks[] = ['callback' => $callback, 'arguments' => $args];
   }
diff --git a/core/lib/Drupal/Component/Assertion/Inspector.php b/core/lib/Drupal/Component/Assertion/Inspector.php
index 25402077dab..945272f9de7 100644
--- a/core/lib/Drupal/Component/Assertion/Inspector.php
+++ b/core/lib/Drupal/Component/Assertion/Inspector.php
@@ -184,7 +184,7 @@ class Inspector {
    *
    * @param mixed $traversable
    *   Variable to be examined.
-   * @param string ...
+   * @param ...$keys
    *   Keys to be searched for.
    *
    * @return bool
@@ -370,7 +370,7 @@ class Inspector {
    *
    * @param mixed $traversable
    *   Variable to be examined.
-   * @param string ...
+   * @param ...$classes
    *   Classes and interfaces to test objects against.
    *
    * @return bool
diff --git a/core/lib/Drupal/Component/Utility/NestedArray.php b/core/lib/Drupal/Component/Utility/NestedArray.php
index ba74210b7aa..80f3822cf42 100644
--- a/core/lib/Drupal/Component/Utility/NestedArray.php
+++ b/core/lib/Drupal/Component/Utility/NestedArray.php
@@ -286,7 +286,7 @@ class NestedArray {
    * $correct = NestedArray::mergeDeep($link_options_1, $link_options_2);
    * @endcode
    *
-   * @param array ...
+   * @param array ...$arrays
    *   Arrays to merge.
    *
    * @return array
@@ -294,8 +294,8 @@ class NestedArray {
    *
    * @see NestedArray::mergeDeepArray()
    */
-  public static function mergeDeep() {
-    return self::mergeDeepArray(func_get_args());
+  public static function mergeDeep(...$arrays) {
+    return self::mergeDeepArray($arrays);
   }
 
   /**
diff --git a/core/lib/Drupal/Core/Cache/Cache.php b/core/lib/Drupal/Core/Cache/Cache.php
index 693e2cd9189..bd0b4508357 100644
--- a/core/lib/Drupal/Core/Cache/Cache.php
+++ b/core/lib/Drupal/Core/Cache/Cache.php
@@ -19,7 +19,7 @@ class Cache {
   /**
    * Merges lists of cache contexts and removes duplicates.
    *
-   * @param list<string> ...
+   * @param list<string> ...$cache_contexts
    *   Cache contexts to merge.
    *
    * @return list<string>
@@ -42,7 +42,7 @@ class Cache {
    * allows items to be invalidated based on all tags attached to the content
    * they're constituted from.
    *
-   * @param list<string> ...
+   * @param list<string> ...$cache_tags
    *   Cache tags to merge.
    *
    * @return list<string>
@@ -59,7 +59,7 @@ class Cache {
    *
    * Ensures infinite max-age (Cache::PERMANENT) is taken into account.
    *
-   * @param int ...
+   * @param int ...$max_ages
    *   Max age values to merge.
    *
    * @return int
diff --git a/core/lib/Drupal/Core/ImageToolkit/ImageToolkitOperationBase.php b/core/lib/Drupal/Core/ImageToolkit/ImageToolkitOperationBase.php
index c1cbceead49..d7a6f70c54a 100644
--- a/core/lib/Drupal/Core/ImageToolkit/ImageToolkitOperationBase.php
+++ b/core/lib/Drupal/Core/ImageToolkit/ImageToolkitOperationBase.php
@@ -97,8 +97,8 @@ abstract class ImageToolkitOperationBase extends PluginBase implements ImageTool
    * @return array
    *   The prepared arguments array.
    *
-   * @throws \InvalidArgumentException.
-   * @throws \Drupal\Component\Plugin\Exception\InvalidPluginDefinitionException.
+   * @throws \InvalidArgumentException
+   * @throws \Drupal\Component\Plugin\Exception\InvalidPluginDefinitionException
    */
   protected function prepareArguments(array $arguments) {
     foreach ($this->arguments() as $id => $argument) {
diff --git a/core/lib/Drupal/Core/Template/Attribute.php b/core/lib/Drupal/Core/Template/Attribute.php
index 7422e26f463..52485e6a538 100644
--- a/core/lib/Drupal/Core/Template/Attribute.php
+++ b/core/lib/Drupal/Core/Template/Attribute.php
@@ -174,13 +174,12 @@ class Attribute implements \ArrayAccess, \IteratorAggregate, MarkupInterface {
   /**
    * Adds classes or merges them on to array of existing CSS classes.
    *
-   * @param string|array ...
+   * @param string|array ...$args
    *   CSS classes to add to the class attribute array.
    *
    * @return $this
    */
-  public function addClass() {
-    $args = func_get_args();
+  public function addClass(...$args) {
     if ($args) {
       $classes = [];
       foreach ($args as $arg) {
@@ -237,13 +236,12 @@ class Attribute implements \ArrayAccess, \IteratorAggregate, MarkupInterface {
   /**
    * Removes an attribute from an Attribute object.
    *
-   * @param string|array ...
+   * @param string|array ...$args
    *   Attributes to remove from the attribute array.
    *
    * @return $this
    */
-  public function removeAttribute() {
-    $args = func_get_args();
+  public function removeAttribute(...$args) {
     foreach ($args as $arg) {
       // Support arrays or multiple arguments.
       if (is_array($arg)) {
@@ -262,15 +260,14 @@ class Attribute implements \ArrayAccess, \IteratorAggregate, MarkupInterface {
   /**
    * Removes argument values from array of existing CSS classes.
    *
-   * @param string|array ...
+   * @param string|array ...$args
    *   CSS classes to remove from the class attribute array.
    *
    * @return $this
    */
-  public function removeClass() {
+  public function removeClass(...$args) {
     // With no class attribute, there is no need to remove.
     if (isset($this->storage['class']) && $this->storage['class'] instanceof AttributeArray) {
-      $args = func_get_args();
       $classes = [];
       foreach ($args as $arg) {
         // Merge the values passed in from the classes array.
diff --git a/core/lib/Drupal/Core/Template/TwigExtension.php b/core/lib/Drupal/Core/Template/TwigExtension.php
index 7ed77162080..cd34aec4497 100644
--- a/core/lib/Drupal/Core/Template/TwigExtension.php
+++ b/core/lib/Drupal/Core/Template/TwigExtension.php
@@ -631,22 +631,20 @@ class TwigExtension extends AbstractExtension {
    *
    * @param array|object $element
    *   The parent renderable array to exclude the child items.
-   * @param string[]|string ...
+   * @param string[]|string ...$args
    *   The string keys of $element to prevent printing. Arguments can include
    *   string keys directly, or arrays of string keys to hide.
    *
    * @return array
    *   The filtered renderable array.
    */
-  public function withoutFilter($element) {
+  public function withoutFilter($element, ...$args) {
     if ($element instanceof \ArrayAccess) {
       $filtered_element = clone $element;
     }
     else {
       $filtered_element = $element;
     }
-    $args = func_get_args();
-    unset($args[0]);
     // Since the remaining arguments can be a mix of arrays and strings, we use
     // some native PHP iterator classes to allow us to recursively iterate over
     // everything in a single pass.
diff --git a/core/lib/Drupal/Core/Url.php b/core/lib/Drupal/Core/Url.php
index 1857ba09048..d16ef550651 100644
--- a/core/lib/Drupal/Core/Url.php
+++ b/core/lib/Drupal/Core/Url.php
@@ -563,7 +563,7 @@ class Url implements TrustedCallbackInterface {
    *
    * @return string
    *
-   * @throws \UnexpectedValueException.
+   * @throws \UnexpectedValueException
    *   If this is a URI with no corresponding route.
    */
   public function getRouteName() {
@@ -579,7 +579,7 @@ class Url implements TrustedCallbackInterface {
    *
    * @return array
    *
-   * @throws \UnexpectedValueException.
+   * @throws \UnexpectedValueException
    *   If this is a URI with no corresponding route.
    */
   public function getRouteParameters() {
@@ -598,7 +598,7 @@ class Url implements TrustedCallbackInterface {
    *
    * @return $this
    *
-   * @throws \UnexpectedValueException.
+   * @throws \UnexpectedValueException
    *   If this is a URI with no corresponding route.
    */
   public function setRouteParameters($parameters) {
@@ -619,7 +619,7 @@ class Url implements TrustedCallbackInterface {
    *
    * @return $this
    *
-   * @throws \UnexpectedValueException.
+   * @throws \UnexpectedValueException
    *   If this is a URI with no corresponding route.
    */
   public function setRouteParameter($key, $value) {
@@ -777,7 +777,7 @@ class Url implements TrustedCallbackInterface {
    * @return string
    *   The internal path for this route.
    *
-   * @throws \UnexpectedValueException.
+   * @throws \UnexpectedValueException
    *   If this is a URI with no corresponding system path.
    */
   public function getInternalPath() {
diff --git a/core/modules/update/tests/src/Unit/UpdateFetcherTest.php b/core/modules/update/tests/src/Unit/UpdateFetcherTest.php
index 57642519cf5..2345a65fe92 100644
--- a/core/modules/update/tests/src/Unit/UpdateFetcherTest.php
+++ b/core/modules/update/tests/src/Unit/UpdateFetcherTest.php
@@ -160,7 +160,7 @@ class UpdateFetcherTest extends UnitTestCase {
   /**
    * Mocks the HTTP client.
    *
-   * @param \GuzzleHttp\Psr7\Response ...
+   * @param \GuzzleHttp\Psr7\Response ...$responses
    *   Variable number of Response objects that the mocked client should return.
    */
   protected function mockClient(Response ...$responses): void {
diff --git a/core/modules/views/views.module b/core/modules/views/views.module
index 84bec7df7a1..c5cc438a7d5 100644
--- a/core/modules/views/views.module
+++ b/core/modules/views/views.module
@@ -726,18 +726,14 @@ function _views_query_tag_alter_condition(AlterableInterface $query, &$condition
  * @param $display_id
  *   The display id to embed. If unsure, use 'default', as it will always be
  *   valid. But things like 'page' or 'block' should work here.
- * @param ...
+ * @param ...$args
  *   Any additional parameters will be passed as arguments.
  *
  * @return array|null
  *   A renderable array containing the view output or NULL if the display ID
  *   of the view to be executed doesn't exist.
  */
-function views_embed_view($name, $display_id = 'default') {
-  $args = func_get_args();
-  // Remove $name and $display_id from the arguments.
-  unset($args[0], $args[1]);
-
+function views_embed_view($name, $display_id = 'default', ...$args) {
   $view = Views::getView($name);
   if (!$view || !$view->access($display_id)) {
     return;
@@ -763,17 +759,13 @@ function views_embed_view($name, $display_id = 'default') {
  *   want to use. A URL will appear in the status bar of your browser. This is
  *   usually at the bottom of the window, in the chrome. Everything after
  *   #views-tab- is the display ID, e.g. page_1.
- * @param ...
+ * @param ...$args
  *   Any additional parameters will be passed as arguments.
  *
  * @return array
  *   An array containing an object for each view item.
  */
-function views_get_view_result($name, $display_id = NULL) {
-  $args = func_get_args();
-  // Remove $name and $display_id from the arguments.
-  unset($args[0], $args[1]);
-
+function views_get_view_result($name, $display_id = NULL, ...$args) {
   $view = Views::getView($name);
   if (is_object($view)) {
     if (is_array($args)) {
diff --git a/core/modules/workflows/src/StateInterface.php b/core/modules/workflows/src/StateInterface.php
index 3335ea7452a..d4fe9871c46 100644
--- a/core/modules/workflows/src/StateInterface.php
+++ b/core/modules/workflows/src/StateInterface.php
@@ -60,7 +60,7 @@ interface StateInterface {
    * @return \Drupal\workflows\TransitionInterface
    *   The Transition object for the provided state ID.
    *
-   * @throws \InvalidArgumentException()
+   * @throws \InvalidArgumentException
    *   Exception thrown when the provided state ID can not be transitioned to.
    */
   public function getTransitionTo($to_state_id);
diff --git a/core/scripts/password-hash.sh b/core/scripts/password-hash.sh
index 70d701d0fb0..fd799f0a6ec 100755
--- a/core/scripts/password-hash.sh
+++ b/core/scripts/password-hash.sh
@@ -5,7 +5,7 @@
  * @file
  * Drupal hash script - to generate a hash from a plaintext password
  *
- * @param password1 [password2 [password3 ...]]
+ * @param string[] ...$password
  *  Plain-text passwords in quotes (or with spaces backslash escaped).
  *
  * @todo Port to a console command. https://www.drupal.org/node/2289409
diff --git a/core/tests/Drupal/Tests/Core/Asset/LibraryDiscoveryParserTest.php b/core/tests/Drupal/Tests/Core/Asset/LibraryDiscoveryParserTest.php
index e5348e1a4b0..830772284eb 100644
--- a/core/tests/Drupal/Tests/Core/Asset/LibraryDiscoveryParserTest.php
+++ b/core/tests/Drupal/Tests/Core/Asset/LibraryDiscoveryParserTest.php
@@ -68,14 +68,14 @@ class LibraryDiscoveryParserTest extends UnitTestCase {
   /**
    * The mocked stream wrapper manager.
    *
-   * @var \Drupal\Core\StreamWrapper\StreamWrapperManagerInterface||\PHPUnit\Framework\MockObject\MockObject
+   * @var \Drupal\Core\StreamWrapper\StreamWrapperManagerInterface|\PHPUnit\Framework\MockObject\MockObject
    */
   protected $streamWrapperManager;
 
   /**
    * The mocked libraries directory file finder.
    *
-   * @var \Drupal\Core\Asset\LibrariesDirectoryFileFinder||\PHPUnit\Framework\MockObject\MockObject
+   * @var \Drupal\Core\Asset\LibrariesDirectoryFileFinder|\PHPUnit\Framework\MockObject\MockObject
    */
   protected $librariesDirectoryFileFinder;
 
diff --git a/core/tests/Drupal/Tests/Core/Routing/AccessAwareRouterTest.php b/core/tests/Drupal/Tests/Core/Routing/AccessAwareRouterTest.php
index 8587efbf478..09b42d393ca 100644
--- a/core/tests/Drupal/Tests/Core/Routing/AccessAwareRouterTest.php
+++ b/core/tests/Drupal/Tests/Core/Routing/AccessAwareRouterTest.php
@@ -42,7 +42,7 @@ class AccessAwareRouterTest extends UnitTestCase {
   protected $accessManager;
 
   /**
-   * @var \Drupal\Core\Session\AccountInterface||\PHPUnit\Framework\MockObject\MockObject
+   * @var \Drupal\Core\Session\AccountInterface|\PHPUnit\Framework\MockObject\MockObject
    */
   protected $currentUser;