diff --git a/core/modules/contextual/src/Element/ContextualLinks.php b/core/modules/contextual/src/Element/ContextualLinks.php
index 62e8966..68021aa 100644
--- a/core/modules/contextual/src/Element/ContextualLinks.php
+++ b/core/modules/contextual/src/Element/ContextualLinks.php
@@ -45,14 +45,14 @@ public function getInfo() {
    *   - route_parameters: The route parameters passed to the url generator.
    *   - metadata: Any additional data needed in order to alter the link.
    *   @code
-   *     array('#contextual_links' => array(
-   *       'block' => array(
-   *         'route_parameters' => array('block' => 'system.menu-tools'),
-   *       ),
-   *       'menu' => array(
-   *         'route_parameters' => array('menu' => 'tools'),
-   *       ),
-   *     ))
+   *     ['#contextual_links' => [
+   *       'block' => [
+   *         'route_parameters' => ['block' => 'system.menu-tools'],
+   *       ],
+   *       'menu' => [
+   *         'route_parameters' => ['menu' => 'tools'],
+   *       ],
+   *     ]]
    *   @endcode
    *
    * @return array
diff --git a/core/modules/field_ui/src/Form/EntityDisplayFormBase.php b/core/modules/field_ui/src/Form/EntityDisplayFormBase.php
index 62a46b1..e420a57 100644
--- a/core/modules/field_ui/src/Form/EntityDisplayFormBase.php
+++ b/core/modules/field_ui/src/Form/EntityDisplayFormBase.php
@@ -76,8 +76,8 @@ public function getEntityFromRouteMatch(RouteMatchInterface $route_match, $entit
    * @return array
    *   Example usage:
    *   @code
-   *     return array(
-   *       'content' => array(
+   *     return [
+   *       'content' => [
    *         // label for the region.
    *         'title' => $this->t('Content'),
    *         // Indicates if the region is visible in the UI.
@@ -85,8 +85,8 @@ public function getEntityFromRouteMatch(RouteMatchInterface $route_match, $entit
    *         // A message to indicate that there is nothing to be displayed in
    *         // the region.
    *         'message' => $this->t('No field is displayed.'),
-   *       ),
-   *     );
+   *       ],
+   *     ];
    *   @endcode
    */
   public function getRegions() {
diff --git a/core/modules/locale/locale.bulk.inc b/core/modules/locale/locale.bulk.inc
index 3e256c2..2e1977e 100644
--- a/core/modules/locale/locale.bulk.inc
+++ b/core/modules/locale/locale.bulk.inc
@@ -205,7 +205,7 @@ function locale_translate_batch_import($file, array $options, &$context) {
           'seek' => 0,
         ];
       }
-      // Update the seek and the number of items in the $options array().
+      // Update the seek and the number of items in the $options array.
       $options['seek'] = $context['sandbox']['parse_state']['seek'];
       $options['items'] = $context['sandbox']['parse_state']['chunk_size'];
       $report = Gettext::fileToDatabase($file, $options);
diff --git a/core/modules/migrate/src/Plugin/Migration.php b/core/modules/migrate/src/Plugin/Migration.php
index 13092e7..a5c0252 100644
--- a/core/modules/migrate/src/Plugin/Migration.php
+++ b/core/modules/migrate/src/Plugin/Migration.php
@@ -162,15 +162,15 @@ class Migration extends PluginBase implements MigrationInterface, RequirementsIn
    *
    * The migration_dependencies value is structured like this:
    * @code
-   * array(
-   *   'required' => array(
+   * [
+   *   'required' => [
    *     // An array of migration IDs that must be run before this migration.
-   *   ),
-   *   'optional' => array(
+   *   ],
+   *   'optional' => [
    *     // An array of migration IDs that, if they exist, must be run before
    *     // this migration.
-   *   ),
-   * );
+   *   ],
+   * ];
    * @endcode
    *
    * @var array
diff --git a/core/modules/node/node.api.php b/core/modules/node/node.api.php
index 6041874..828e50d 100644
--- a/core/modules/node/node.api.php
+++ b/core/modules/node/node.api.php
@@ -43,20 +43,20 @@
  * access modules can also grant "view all" permission on their custom realms;
  * for example, a module could create a record in {node_access} with:
  * @code
- * $record = array(
+ * $record = [
  *   'nid' => 0,
  *   'gid' => 888,
  *   'realm' => 'example_realm',
  *   'grant_view' => 1,
  *   'grant_update' => 0,
  *   'grant_delete' => 0,
- * );
+ * ];
  * db_insert('node_access')->fields($record)->execute();
  * @endcode
  * And then in its hook_node_grants() implementation, it would need to return:
  * @code
  * if ($op == 'view') {
- *   $grants['example_realm'] = array(888);
+ *   $grants['example_realm'] = [888];
  * }
  * @endcode
  * If you decide to do this, be aware that the node_access_rebuild() function
@@ -130,14 +130,14 @@ function hook_node_grants(\Drupal\Core\Session\AccountInterface $account, $op) {
  * A "deny all" grant may be used to deny all access to a particular node or
  * node translation:
  * @code
- * $grants[] = array(
+ * $grants[] = [
  *   'realm' => 'all',
  *   'gid' => 0,
  *   'grant_view' => 0,
  *   'grant_update' => 0,
  *   'grant_delete' => 0,
  *   'langcode' => 'ca',
- * );
+ * ];
  * @endcode
  * Note that another module node access module could override this by granting
  * access to one or more nodes, since grants are additive. To enforce that
diff --git a/core/modules/node/src/Plugin/Search/NodeSearch.php b/core/modules/node/src/Plugin/Search/NodeSearch.php
index 6d7c8eb..d942612 100644
--- a/core/modules/node/src/Plugin/Search/NodeSearch.php
+++ b/core/modules/node/src/Plugin/Search/NodeSearch.php
@@ -237,7 +237,7 @@ protected function findResults() {
     // \Drupal::request()->query->get('f') is an array that looks like this in
     // the URL: ?f[]=type:page&f[]=term:27&f[]=term:13&f[]=langcode:en
     // So $parameters['f'] looks like:
-    // array('type:page', 'term:27', 'term:13', 'langcode:en');
+    // ['type:page', 'term:27', 'term:13', 'langcode:en'];
     // We need to parse this out into query conditions, some of which go into
     // the keywords string, and some of which are separate conditions.
     $parameters = $this->getParameters();
diff --git a/core/modules/rest/src/Plugin/ResourceInterface.php b/core/modules/rest/src/Plugin/ResourceInterface.php
index 7e92c57..43eafb9 100644
--- a/core/modules/rest/src/Plugin/ResourceInterface.php
+++ b/core/modules/rest/src/Plugin/ResourceInterface.php
@@ -46,7 +46,7 @@ public function permissions();
    * Returns the available HTTP request methods on this plugin.
    *
    * @return array
-   *   The list of supported methods. Example: array('GET', 'POST', 'PATCH').
+   *   The list of supported methods. Example: ['GET', 'POST', 'PATCH'].
    */
   public function availableMethods();
 
diff --git a/core/modules/simpletest/simpletest.module b/core/modules/simpletest/simpletest.module
index 8b1cc23..ae4f2ba 100644
--- a/core/modules/simpletest/simpletest.module
+++ b/core/modules/simpletest/simpletest.module
@@ -566,13 +566,13 @@ function simpletest_log_read($test_id, $database_prefix, $test_class) {
  *   An array of tests keyed with the groups, and then keyed by test classes.
  *   For example:
  *   @code
- *     $groups['Block'] => array(
- *       'BlockTestCase' => array(
+ *     $groups['Block'] => [
+ *       'BlockTestCase' => [
  *         'name' => 'Block functionality',
  *         'description' => 'Add, edit and delete custom block.',
  *         'group' => 'Block',
- *       ),
- *     );
+ *       ],
+ *     ];
  *   @endcode
  *
  * @deprecated in Drupal 8.3.x, for removal before 9.0.0 release. Use
diff --git a/core/modules/simpletest/src/BlockCreationTrait.php b/core/modules/simpletest/src/BlockCreationTrait.php
index b252d9e..bef22c5 100644
--- a/core/modules/simpletest/src/BlockCreationTrait.php
+++ b/core/modules/simpletest/src/BlockCreationTrait.php
@@ -21,9 +21,9 @@
    *   Override the defaults by specifying the key and value in the array, for
    *   example:
    *   @code
-   *     $this->drupalPlaceBlock('system_powered_by_block', array(
+   *     $this->drupalPlaceBlock('system_powered_by_block', [
    *       'label' => t('Hello, world!'),
-   *     ));
+   *     ]);
    *   @endcode
    *   The following defaults are provided:
    *   - label: Random string.
diff --git a/core/modules/simpletest/src/NodeCreationTrait.php b/core/modules/simpletest/src/NodeCreationTrait.php
index 20dc3f8..2a3d555 100644
--- a/core/modules/simpletest/src/NodeCreationTrait.php
+++ b/core/modules/simpletest/src/NodeCreationTrait.php
@@ -44,18 +44,18 @@ public function getNodeByTitle($title, $reset = FALSE) {
    *   entity_create(). Override the defaults by specifying the key and value
    *   in the array, for example:
    *   @code
-   *     $this->drupalCreateNode(array(
+   *     $this->drupalCreateNode([
    *       'title' => t('Hello, world!'),
    *       'type' => 'article',
-   *     ));
+   *     ]);
    *   @endcode
    *   The following defaults are provided:
    *   - body: Random string using the default filter format:
    *     @code
-   *       $settings['body'][0] = array(
+   *       $settings['body'][0] = [
    *         'value' => $this->randomMachineName(32),
    *         'format' => filter_default_format(),
-   *       );
+   *       ];
    *     @endcode
    *   - title: Random string.
    *   - type: 'page'.
diff --git a/core/modules/simpletest/src/TestBase.php b/core/modules/simpletest/src/TestBase.php
index 1491cc2..1a94cbd 100644
--- a/core/modules/simpletest/src/TestBase.php
+++ b/core/modules/simpletest/src/TestBase.php
@@ -854,7 +854,7 @@ protected function verbose($message) {
    *
    * @param $methods
    *   (optional) A list of method names in the test case class to run; e.g.,
-   *   array('testFoo', 'testBar'). By default, all methods of the class are
+   *   ['testFoo', 'testBar']. By default, all methods of the class are
    *   taken into account, but it can be useful to only run a few selected test
    *   methods during debugging.
    */
@@ -1351,18 +1351,18 @@ protected function settingsSet($name, $value) {
    *
    * Example:
    * @code
-   * $parameters = array(
-   *   'one' => array(0, 1),
-   *   'two' => array(2, 3),
-   * );
+   * $parameters = [
+   *   'one' => [0, 1],
+   *   'two' => [2, 3],
+   * ];
    * $permutations = TestBase::generatePermutations($parameters);
    * // Result:
-   * $permutations == array(
-   *   array('one' => 0, 'two' => 2),
-   *   array('one' => 1, 'two' => 2),
-   *   array('one' => 0, 'two' => 3),
-   *   array('one' => 1, 'two' => 3),
-   * )
+   * $permutations == [
+   *   ['one' => 0, 'two' => 2],
+   *   ['one' => 1, 'two' => 2],
+   *   ['one' => 0, 'two' => 3],
+   *   ['one' => 1, 'two' => 3],
+   * ]
    * @endcode
    *
    * @param $parameters
diff --git a/core/modules/simpletest/src/TestDiscovery.php b/core/modules/simpletest/src/TestDiscovery.php
index 5374520..ff1ca59 100644
--- a/core/modules/simpletest/src/TestDiscovery.php
+++ b/core/modules/simpletest/src/TestDiscovery.php
@@ -143,13 +143,13 @@ public function registerTestNamespaces() {
    * @return array
    *   An array of tests keyed by the the group name.
    * @code
-   *     $groups['block'] => array(
-   *       'Drupal\block\Tests\BlockTest' => array(
+   *     $groups['block'] => [
+   *       'Drupal\block\Tests\BlockTest' => [
    *         'name' => 'Drupal\block\Tests\BlockTest',
    *         'description' => 'Tests block UI CRUD functionality.',
    *         'group' => 'block',
-   *       ),
-   *     );
+   *       ],
+   *     ];
    * @endcode
    *
    * @todo Remove singular grouping; retain list of groups in 'group' key.
diff --git a/core/modules/simpletest/src/WebTestBase.php b/core/modules/simpletest/src/WebTestBase.php
index 2491bc8..ce5dc7e 100644
--- a/core/modules/simpletest/src/WebTestBase.php
+++ b/core/modules/simpletest/src/WebTestBase.php
@@ -316,7 +316,7 @@ protected function findBlockInstance(Block $block) {
    * For example:
    * @code
    *   // Create a user.
-   *   $account = $this->drupalCreateUser(array());
+   *   $account = $this->drupalCreateUser([]);
    *   $this->drupalLogin($account);
    *   // Load real user object.
    *   $pass_raw = $account->pass_raw;
@@ -562,10 +562,10 @@ protected function getDatabaseTypes() {
    *   Array of values containing the untranslated string and its translation.
    *   For example:
    *   @code
-   *   array(
-   *     '' => array('Sunday' => 'domingo'),
-   *     'Long month name' => array('March' => 'marzo'),
-   *   );
+   *   [
+   *     '' => ['Sunday' => 'domingo'],
+   *     'Long month name' => ['March' => 'marzo'],
+   *   ];
    *   @endcode
    *   Pass an empty array to remove all existing custom translations for the
    *   given $langcode.
@@ -923,7 +923,7 @@ protected function drupalGet($path, array $options = [], array $headers = []) {
    * @param array $options
    *   Array of URL options.
    * @param array $headers
-   *   Array of headers. Eg array('Accept: application/vnd.drupal-ajax').
+   *   Array of headers. Eg ['Accept: application/vnd.drupal-ajax'].
    *
    * @return array
    *   Decoded json.
@@ -1002,11 +1002,11 @@ protected function drupalGetXHR($path, array $options = [], array $headers = [])
    *
    *   @code
    *   // First step in form.
-   *   $edit = array(...);
+   *   $edit = [...];
    *   $this->drupalPostForm('some_url', $edit, t('Save'));
    *
    *   // Second step in form.
-   *   $edit = array(...);
+   *   $edit = [...];
    *   $this->drupalPostForm(NULL, $edit, t('Save'));
    *   @endcode
    * @param $edit
@@ -1030,8 +1030,8 @@ protected function drupalGetXHR($path, array $options = [], array $headers = [])
    *   be unchecked. Multiple select fields can be tested using 'name[]' and
    *   setting each of the desired values in an array:
    *   @code
-   *   $edit = array();
-   *   $edit['name[]'] = array('value1', 'value2');
+   *   $edit = [];
+   *   $edit['name[]'] = ['value1', 'value2'];
    *   @endcode
    * @param $submit
    *   Value of the submit button whose click is to be emulated. For example,
@@ -1195,7 +1195,7 @@ protected function drupalPostForm($path, $edit, $submit, array $options = [], ar
    *   The name of the form element that is responsible for triggering the Ajax
    *   functionality to test. May be a string or, if the triggering element is
    *   a button, an associative array where the key is the name of the button
-   *   and the value is the button label. i.e.) array('op' => t('Refresh')).
+   *   and the value is the button label. i.e.) ['op' => t('Refresh')].
    * @param $ajax_path
    *   (optional) Override the path set by the Ajax settings of the triggering
    *   element.
diff --git a/core/modules/user/user.module b/core/modules/user/user.module
index b865e95..c0c2015 100644
--- a/core/modules/user/user.module
+++ b/core/modules/user/user.module
@@ -1112,13 +1112,13 @@ function user_role_load($rid) {
  *   Any value that evaluates to FALSE will cause the permission to be
  *   revoked.
  *   @code
- *     array(
+ *     [
  *       'administer nodes' => 0,                // Revoke 'administer nodes'
  *       'administer blocks' => FALSE,           // Revoke 'administer blocks'
  *       'access user profiles' => 1,            // Grant 'access user profiles'
  *       'access content' => TRUE,               // Grant 'access content'
  *       'access comments' => 'access comments', // Grant 'access comments'
- *     )
+ *     ]
  *   @endcode
  *   Existing permissions are not changed, unless specified in $permissions.
  *
diff --git a/core/modules/views/src/Annotation/ViewsDisplay.php b/core/modules/views/src/Annotation/ViewsDisplay.php
index 85887e3..97aa5c7 100644
--- a/core/modules/views/src/Annotation/ViewsDisplay.php
+++ b/core/modules/views/src/Annotation/ViewsDisplay.php
@@ -84,10 +84,10 @@ class ViewsDisplay extends ViewsPluginAnnotationBase {
    * A list of places where contextual links should be added.
    * For example:
    * @code
-   * array(
+   * [
    *   'page',
    *   'block',
-   * )
+   * ]
    * @endcode
    *
    * If you don't specify it there will be contextual links rendered for all
diff --git a/core/modules/views/src/Plugin/Derivative/ViewsLocalTask.php b/core/modules/views/src/Plugin/Derivative/ViewsLocalTask.php
index bc6400c..d7c40c3 100644
--- a/core/modules/views/src/Plugin/Derivative/ViewsLocalTask.php
+++ b/core/modules/views/src/Plugin/Derivative/ViewsLocalTask.php
@@ -152,10 +152,10 @@ public function alterLocalTasks(&$local_tasks) {
    * @return array
    *   A list of arrays containing the $view and $display_id.
    * @code
-   * array(
-   *   array($view, $display_id),
-   *   array($view, $display_id),
-   * );
+   * [
+   *   [$view, $display_id],
+   *   [$view, $display_id],
+   * ];
    * @endcode
    */
   protected function getApplicableMenuViews() {
diff --git a/core/modules/views/src/Plugin/views/join/JoinPluginBase.php b/core/modules/views/src/Plugin/views/join/JoinPluginBase.php
index 0aa6aa3..0f6f69b 100644
--- a/core/modules/views/src/Plugin/views/join/JoinPluginBase.php
+++ b/core/modules/views/src/Plugin/views/join/JoinPluginBase.php
@@ -24,13 +24,13 @@
  * @endcode
  * Use this configuration:
  * @code
- * $configuration = array(
+ * $configuration = [
  *   'table' => 'two',
  *   'field' => 'field_b',
  *   'left_table' => 'one',
  *   'left_field' => 'field_a',
  *   'operator' => '=',
- * );
+ * ];
  * $join = Views::pluginManager('join')->createInstance('standard', $configuration);
  * @endcode
  * Note that the default join type is a LEFT join when 'type' is not supplied in
@@ -42,20 +42,20 @@
  * @endcode
  * Use this configuration:
  * @code
- * $configuration = array(
+ * $configuration = [
  *   'type' => 'INNER',
  *   'table' => 'two',
  *   'field' => 'field_b',
  *   'left_table' => 'one',
  *   'left_field' => 'field_a',
  *   'operator' => '=',
- *   'extra' => array(
- *     0 => array(
+ *   'extra' => [
+ *     0 => [
  *       'left_field' => 'field_c',
  *       'value' => 'some_val',
- *     ),
- *   ),
- * );
+ *     ],
+ *   ],
+ * ];
  * $join = Views::pluginManager('join')->createInstance('standard', $configuration);
  * @endcode
  *
@@ -65,20 +65,20 @@
  * @endcode
  * Use this configuration:
  * @code
- * $configuration = array(
+ * $configuration = [
  *   'type' => 'INNER',
  *   'table' => 'two',
  *   'field' => 'field_b',
  *   'left_table' => 'one',
  *   'left_field' => 'field_a',
  *   'operator' => '=',
- *   'extra' => array(
- *     0 => array(
+ *   'extra' => [
+ *     0 => [
  *       'field' => 'field_d',
  *       'value' => 'other_val',
- *     ),
- *   ),
- * );
+ *     ],
+ *   ],
+ * ];
  * $join = Views::pluginManager('join')->createInstance('standard', $configuration);
  * @endcode
  *
@@ -88,20 +88,20 @@
  * @endcode
  * Use this configuration:
  * @code
- * $configuration = array(
+ * $configuration = [
  *   'type' => 'INNER',
  *   'table' => 'two',
  *   'field' => 'field_b',
  *   'left_table' => 'one',
  *   'left_field' => 'field_a',
  *   'operator' => '=',
- *   'extra' => array(
- *     0 => array(
+ *   'extra' => [
+ *     0 => [
  *       'left_field' => 'field_c',
  *       'field' => 'field_d',
- *     ),
- *   ),
- * );
+ *     ],
+ *   ],
+ * ];
  * $join = Views::pluginManager('join')->createInstance('standard', $configuration);
  * @endcode
  *
diff --git a/core/modules/views/views.api.php b/core/modules/views/views.api.php
index c21b9c5..e7a55cf 100644
--- a/core/modules/views/views.api.php
+++ b/core/modules/views/views.api.php
@@ -837,7 +837,7 @@ function hook_views_pre_render(ViewExecutable $view) {
  * And then in the post-render, create an array with the text that should
  * go there:
  * @code
- *   strtr($output, array('<!--post-FIELD-1-->' => 'output for FIELD of nid 1');
+ *   strtr($output, ['<!--post-FIELD-1-->' => 'output for FIELD of nid 1'];
  * @endcode
  * All of the cached result data will be available in $view->result, as well,
  * so all ids used in the query should be discoverable.
diff --git a/core/modules/views_ui/admin.inc b/core/modules/views_ui/admin.inc
index a2d9fed..a7c6ac8 100644
--- a/core/modules/views_ui/admin.inc
+++ b/core/modules/views_ui/admin.inc
@@ -38,7 +38,7 @@
  *   An array of parent keys that point to the part of the form that will be
  *   refreshed by AJAX. For example, if triggering the AJAX behavior should
  *   cause $form['dynamic_content']['section'] to be refreshed, you would pass
- *   array('dynamic_content', 'section') for this parameter.
+ *   ['dynamic_content', 'section'] for this parameter.
  */
 function views_ui_add_ajax_trigger(&$wrapping_element, $trigger_key, $refresh_parents) {
   $seen_ids = &drupal_static(__FUNCTION__ . ':seen_ids', []);
diff --git a/core/modules/views_ui/src/Form/Ajax/RearrangeFilter.php b/core/modules/views_ui/src/Form/Ajax/RearrangeFilter.php
index 3298681..c150617 100644
--- a/core/modules/views_ui/src/Form/Ajax/RearrangeFilter.php
+++ b/core/modules/views_ui/src/Form/Ajax/RearrangeFilter.php
@@ -77,12 +77,12 @@ public function buildForm(array $form, FormStateInterface $form_state) {
 
     /**
      * Filter groups is an array that contains:
-     * array(
+     * [
      *   'operator' => 'and' || 'or',
-     *   'groups' => array(
+     *   'groups' => [
      *     $group_id => 'and' || 'or',
-     *   ),
-     * );
+     *   ],
+     * ];
      */
 
     $grouping = count(array_keys($groups['groups'])) > 1;
@@ -330,7 +330,7 @@ public function submitForm(array &$form, FormStateInterface $form_state) {
   /**
    * Adds one to each key of an array.
    *
-   * For example array(0 => 'foo') would be array(1 => 'foo').
+   * For example [0 => 'foo'] would be [1 => 'foo'].
    *
    * @param array $array
    *   The array to increment keys on.