diff --git a/core/modules/contextual/src/Element/ContextualLinks.php b/core/modules/contextual/src/Element/ContextualLinks.php
index 68021aa303..62e8966afa 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
-   *     ['#contextual_links' => [
-   *       'block' => [
-   *         'route_parameters' => ['block' => 'system.menu-tools'],
-   *       ],
-   *       'menu' => [
-   *         'route_parameters' => ['menu' => 'tools'],
-   *       ],
-   *     ]]
+   *     array('#contextual_links' => array(
+   *       'block' => array(
+   *         'route_parameters' => array('block' => 'system.menu-tools'),
+   *       ),
+   *       'menu' => array(
+   *         'route_parameters' => array('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 6fe5cf17d1..0a91862b35 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 [
-   *       'content' => [
+   *     return array(
+   *       'content' => array(
    *         // 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/migrate/src/Plugin/Migration.php b/core/modules/migrate/src/Plugin/Migration.php
index a5c0252c1b..13092e7775 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
-   * [
-   *   'required' => [
+   * array(
+   *   'required' => array(
    *     // An array of migration IDs that must be run before this migration.
-   *   ],
-   *   'optional' => [
+   *   ),
+   *   'optional' => array(
    *     // 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 828e50dfbf..604187406b 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 = [
+ * $record = array(
  *   'nid' => 0,
  *   'gid' => 888,
  *   'realm' => 'example_realm',
  *   'grant_view' => 1,
  *   'grant_update' => 0,
  *   'grant_delete' => 0,
- * ];
+ * );
  * db_insert('node_access')->fields($record)->execute();
  * @endcode
  * And then in its hook_node_grants() implementation, it would need to return:
  * @code
  * if ($op == 'view') {
- *   $grants['example_realm'] = [888];
+ *   $grants['example_realm'] = array(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[] = [
+ * $grants[] = array(
  *   'realm' => 'all',
  *   'gid' => 0,
  *   'grant_view' => 0,
  *   'grant_update' => 0,
  *   'grant_delete' => 0,
  *   'langcode' => 'ca',
- * ];
+ * );
  * @endcode
  * Note that another module node access module could override this by granting
  * access to one or more nodes, since grants are additive. To enforce that
diff --git a/core/modules/simpletest/simpletest.module b/core/modules/simpletest/simpletest.module
index 81fd8b0f5f..e5c67d3954 100644
--- a/core/modules/simpletest/simpletest.module
+++ b/core/modules/simpletest/simpletest.module
@@ -573,13 +573,13 @@ function simpletest_log_read($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'] => [
- *       'BlockTestCase' => [
+ *     $groups['Block'] => array(
+ *       'BlockTestCase' => array(
  *         '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 bef22c5daa..b252d9e9e6 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', [
+   *     $this->drupalPlaceBlock('system_powered_by_block', array(
    *       'label' => t('Hello, world!'),
-   *     ]);
+   *     ));
    *   @endcode
    *   The following defaults are provided:
    *   - label: Random string.
diff --git a/core/modules/simpletest/src/NodeCreationTrait.php b/core/modules/simpletest/src/NodeCreationTrait.php
index 2a3d55534c..20dc3f8379 100644
--- a/core/modules/simpletest/src/NodeCreationTrait.php
+++ b/core/modules/simpletest/src/NodeCreationTrait.php
@@ -44,18 +44,18 @@ public function getNodeByTitle($title, $reset = FALSE) {
    *   entity_create(). Override the defaults by specifying the key and value
    *   in the array, for example:
    *   @code
-   *     $this->drupalCreateNode([
+   *     $this->drupalCreateNode(array(
    *       'title' => t('Hello, world!'),
    *       'type' => 'article',
-   *     ]);
+   *     ));
    *   @endcode
    *   The following defaults are provided:
    *   - body: Random string using the default filter format:
    *     @code
-   *       $settings['body'][0] = [
+   *       $settings['body'][0] = array(
    *         'value' => $this->randomMachineName(32),
    *         'format' => filter_default_format(),
-   *       ];
+   *       );
    *     @endcode
    *   - title: Random string.
    *   - type: 'page'.
diff --git a/core/modules/simpletest/src/TestBase.php b/core/modules/simpletest/src/TestBase.php
index 1a94cbdff6..0c64a14c6e 100644
--- a/core/modules/simpletest/src/TestBase.php
+++ b/core/modules/simpletest/src/TestBase.php
@@ -1351,18 +1351,18 @@ protected function settingsSet($name, $value) {
    *
    * Example:
    * @code
-   * $parameters = [
-   *   'one' => [0, 1],
-   *   'two' => [2, 3],
-   * ];
+   * $parameters = array(
+   *   'one' => array(0, 1),
+   *   'two' => array(2, 3),
+   * );
    * $permutations = TestBase::generatePermutations($parameters);
    * // Result:
-   * $permutations == [
-   *   ['one' => 0, 'two' => 2],
-   *   ['one' => 1, 'two' => 2],
-   *   ['one' => 0, 'two' => 3],
-   *   ['one' => 1, 'two' => 3],
-   * ]
+   * $permutations == array(
+   *   array('one' => 0, 'two' => 2),
+   *   array('one' => 1, 'two' => 2),
+   *   array('one' => 0, 'two' => 3),
+   *   array('one' => 1, 'two' => 3),
+   * )
    * @endcode
    *
    * @param $parameters
diff --git a/core/modules/simpletest/src/TestDiscovery.php b/core/modules/simpletest/src/TestDiscovery.php
index ff1ca59907..5374520e56 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'] => [
-   *       'Drupal\block\Tests\BlockTest' => [
+   *     $groups['block'] => array(
+   *       'Drupal\block\Tests\BlockTest' => array(
    *         '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 ce5dc7eebd..eab42e9166 100644
--- a/core/modules/simpletest/src/WebTestBase.php
+++ b/core/modules/simpletest/src/WebTestBase.php
@@ -562,10 +562,10 @@ protected function getDatabaseTypes() {
    *   Array of values containing the untranslated string and its translation.
    *   For example:
    *   @code
-   *   [
-   *     '' => ['Sunday' => 'domingo'],
-   *     'Long month name' => ['March' => 'marzo'],
-   *   ];
+   *   array(
+   *     '' => array('Sunday' => 'domingo'),
+   *     'Long month name' => array('March' => 'marzo'),
+   *   );
    *   @endcode
    *   Pass an empty array to remove all existing custom translations for the
    *   given $langcode.
@@ -1002,11 +1002,11 @@ protected function drupalGetXHR($path, array $options = [], array $headers = [])
    *
    *   @code
    *   // First step in form.
-   *   $edit = [...];
+   *   $edit = array(...);
    *   $this->drupalPostForm('some_url', $edit, t('Save'));
    *
    *   // Second step in form.
-   *   $edit = [...];
+   *   $edit = array(...);
    *   $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 = [];
-   *   $edit['name[]'] = ['value1', 'value2'];
+   *   $edit = array();
+   *   $edit['name[]'] = array('value1', 'value2');
    *   @endcode
    * @param $submit
    *   Value of the submit button whose click is to be emulated. For example,
diff --git a/core/modules/user/user.module b/core/modules/user/user.module
index 4779e5992d..61faa3b4f0 100644
--- a/core/modules/user/user.module
+++ b/core/modules/user/user.module
@@ -1112,13 +1112,13 @@ function user_role_load($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 $permissions.
  *
diff --git a/core/modules/views/src/Annotation/ViewsDisplay.php b/core/modules/views/src/Annotation/ViewsDisplay.php
index 97aa5c7107..85887e352d 100644
--- a/core/modules/views/src/Annotation/ViewsDisplay.php
+++ b/core/modules/views/src/Annotation/ViewsDisplay.php
@@ -84,10 +84,10 @@ class ViewsDisplay extends ViewsPluginAnnotationBase {
    * A list of places where contextual links should be added.
    * For example:
    * @code
-   * [
+   * array(
    *   'page',
    *   'block',
-   * ]
+   * )
    * @endcode
    *
    * If you don't specify it there will be contextual links rendered for all
diff --git a/core/modules/views/src/Plugin/Derivative/ViewsLocalTask.php b/core/modules/views/src/Plugin/Derivative/ViewsLocalTask.php
index d7c40c3b42..bc6400c018 100644
--- a/core/modules/views/src/Plugin/Derivative/ViewsLocalTask.php
+++ b/core/modules/views/src/Plugin/Derivative/ViewsLocalTask.php
@@ -152,10 +152,10 @@ public function alterLocalTasks(&$local_tasks) {
    * @return array
    *   A list of arrays containing the $view and $display_id.
    * @code
-   * [
-   *   [$view, $display_id],
-   *   [$view, $display_id],
-   * ];
+   * array(
+   *   array($view, $display_id),
+   *   array($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 0f6f69b5d4..0aa6aa3b67 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 = [
+ * $configuration = array(
  *   '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 = [
+ * $configuration = array(
  *   'type' => 'INNER',
  *   'table' => 'two',
  *   'field' => 'field_b',
  *   'left_table' => 'one',
  *   'left_field' => 'field_a',
  *   'operator' => '=',
- *   'extra' => [
- *     0 => [
+ *   'extra' => array(
+ *     0 => array(
  *       '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 = [
+ * $configuration = array(
  *   'type' => 'INNER',
  *   'table' => 'two',
  *   'field' => 'field_b',
  *   'left_table' => 'one',
  *   'left_field' => 'field_a',
  *   'operator' => '=',
- *   'extra' => [
- *     0 => [
+ *   'extra' => array(
+ *     0 => array(
  *       'field' => 'field_d',
  *       'value' => 'other_val',
- *     ],
- *   ],
- * ];
+ *     ),
+ *   ),
+ * );
  * $join = Views::pluginManager('join')->createInstance('standard', $configuration);
  * @endcode
  *
@@ -88,20 +88,20 @@
  * @endcode
  * Use this configuration:
  * @code
- * $configuration = [
+ * $configuration = array(
  *   'type' => 'INNER',
  *   'table' => 'two',
  *   'field' => 'field_b',
  *   'left_table' => 'one',
  *   'left_field' => 'field_a',
  *   'operator' => '=',
- *   'extra' => [
- *     0 => [
+ *   'extra' => array(
+ *     0 => array(
  *       '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 e7a55cf021..c21b9c54e8 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, ['<!--post-FIELD-1-->' => 'output for FIELD of nid 1'];
+ *   strtr($output, array('<!--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/sites/default/default.settings.php b/sites/default/default.settings.php
index 72d1de1f90..41424c137f 100644
--- a/sites/default/default.settings.php
+++ b/sites/default/default.settings.php
@@ -154,13 +154,13 @@
  * The 'default' element is mandatory and holds the prefix for any tables
  * not specified elsewhere in the array. Example:
  * @code
- *   'prefix' => [
+ *   'prefix' => array(
  *     'default'   => 'main_',
  *     'users'     => 'shared_',
  *     'sessions'  => 'shared_',
  *     'role'      => 'shared_',
  *     'authmap'   => 'shared_',
- *   ],
+ *   ),
  * @endcode
  * You can also use a reference to a schema/database as a prefix. This may be
  * useful if your Drupal installation exists in a schema that is not the default
@@ -168,13 +168,13 @@
  * time.
  * Example:
  * @code
- *   'prefix' => [
+ *   'prefix' => array(
  *     'default'   => 'main.',
  *     'users'     => 'shared.',
  *     'sessions'  => 'shared.',
  *     'role'      => 'shared.',
  *     'authmap'   => 'shared.',
- *   ];
+ *   );
  * @endcode
  * NOTE: MySQL and SQLite's definition of a schema is a database.
  *
@@ -183,14 +183,14 @@
  * example, to enable MySQL SELECT queries to exceed the max_join_size system
  * variable, and to reduce the database connection timeout to 5 seconds:
  * @code
- * $databases['default']['default'] = [
- *   'init_commands' => [
+ * $databases['default']['default'] = array(
+ *   'init_commands' => array(
  *     'big_selects' => 'SET SQL_BIG_SELECTS=1',
- *   ],
- *   'pdo' => [
+ *   ),
+ *   'pdo' => array(
  *     PDO::ATTR_TIMEOUT => 5,
- *   ],
- * ];
+ *   ),
+ * );
  * @endcode
  *
  * WARNING: The above defaults are designed for database portability. Changing
@@ -205,22 +205,22 @@
  *
  * Sample Database configuration format for PostgreSQL (pgsql):
  * @code
- *   $databases['default']['default'] = [
+ *   $databases['default']['default'] = array(
  *     'driver' => 'pgsql',
  *     'database' => 'databasename',
  *     'username' => 'sqlusername',
  *     'password' => 'sqlpassword',
  *     'host' => 'localhost',
  *     'prefix' => '',
- *   ];
+ *   );
  * @endcode
  *
  * Sample Database configuration format for SQLite (sqlite):
  * @code
- *   $databases['default']['default'] = [
+ *   $databases['default']['default'] = array(
  *     'driver' => 'sqlite',
  *     'database' => '/path/to/databasefilename',
- *   ];
+ *   );
  * @endcode
  */
 
@@ -244,9 +244,9 @@
  *
  * Example:
  * @code
- *   $config_directories = [
+ *   $config_directories = array(
  *     CONFIG_SYNC_DIRECTORY => '/directory/outside/webroot',
- *   ];
+ *   );
  * @endcode
  */
 $config_directories = [];
@@ -709,9 +709,9 @@
  *
  * For example:
  * @code
- * $settings['trusted_host_patterns'] = [
+ * $settings['trusted_host_patterns'] = array(
  *   '^www\.example\.com$',
- * ];
+ * );
  * @endcode
  * will allow the site to only run from www.example.com.
  *
@@ -722,12 +722,12 @@
  *
  * For example:
  * @code
- * $settings['trusted_host_patterns'] = [
+ * $settings['trusted_host_patterns'] = array(
  *   '^example\.com$',
  *   '^.+\.example\.com$',
  *   '^example\.org$',
  *   '^.+\.example\.org$',
- * ];
+ * );
  * @endcode
  * will allow the site to run off of all variants of example.com and
  * example.org, with all subdomains included.