diff --git a/core/lib/Drupal/Core/Entity/Sql/SqlContentEntityStorage.php b/core/lib/Drupal/Core/Entity/Sql/SqlContentEntityStorage.php
index 1172406e34..d615e0c843 100644
--- a/core/lib/Drupal/Core/Entity/Sql/SqlContentEntityStorage.php
+++ b/core/lib/Drupal/Core/Entity/Sql/SqlContentEntityStorage.php
@@ -1727,7 +1727,7 @@ public function countFieldData($storage_definition, $as_bool = FALSE) {
    */
   protected function storageDefinitionIsDeleted(FieldStorageDefinitionInterface $storage_definition) {
     // Configurable fields are marked for deletion.
-    if ($storage_definition instanceOf FieldStorageConfigInterface) {
+    if ($storage_definition instanceof FieldStorageConfigInterface) {
       return $storage_definition->isDeleted();
     }
     // For non configurable fields check whether they are still in the last
diff --git a/core/modules/migrate/tests/src/Kernel/Plugin/MigrationProvidersExistTest.php b/core/modules/migrate/tests/src/Kernel/Plugin/MigrationProvidersExistTest.php
index 7c1379a025..8e166998c4 100644
--- a/core/modules/migrate/tests/src/Kernel/Plugin/MigrationProvidersExistTest.php
+++ b/core/modules/migrate/tests/src/Kernel/Plugin/MigrationProvidersExistTest.php
@@ -2,7 +2,7 @@
 
 namespace Drupal\Tests\migrate\Kernel\Plugin;
 
-Use Drupal\Component\Render\FormattableMarkup;
+use Drupal\Component\Render\FormattableMarkup;
 use Drupal\KernelTests\FileSystemModuleDiscoveryDataProviderTrait;
 use Drupal\Tests\migrate_drupal\Kernel\MigrateDrupalTestBase;
 
diff --git a/core/phpcs.xml.dist b/core/phpcs.xml.dist
index 5b41b69a8a..274b7e41fe 100644
--- a/core/phpcs.xml.dist
+++ b/core/phpcs.xml.dist
@@ -111,6 +111,7 @@
   <rule ref="Generic.NamingConventions.UpperCaseConstantName"/>
   <rule ref="Generic.PHP.DeprecatedFunctions"/>
   <rule ref="Generic.PHP.DisallowShortOpenTag"/>
+  <rule ref="Generic.PHP.LowerCaseKeyword" />
   <rule ref="Generic.PHP.UpperCaseConstant"/>
   <rule ref="Generic.WhiteSpace.DisallowTabIndent"/>
   <rule ref="Generic.Arrays.DisallowLongArraySyntax" />
diff --git a/core/tests/Drupal/Tests/Core/Database/UrlConversionTest.php b/core/tests/Drupal/Tests/Core/Database/UrlConversionTest.php
index 06653f6c3e..c514b2e652 100644
--- a/core/tests/Drupal/Tests/Core/Database/UrlConversionTest.php
+++ b/core/tests/Drupal/Tests/Core/Database/UrlConversionTest.php
@@ -94,7 +94,7 @@ public function providerInvalidArgumentsUrlConversion() {
    *
    * @dataProvider providerGetConnectionInfoAsUrl
    */
-  public function testGetConnectionInfoAsUrl(Array $info, $expected_url) {
+  public function testGetConnectionInfoAsUrl(array $info, $expected_url) {
 
     Database::addConnectionInfo('default', 'default', $info);
     $url = Database::getConnectionInfoAsUrl();