diff --git a/apps/comments/lib/Activity/Listener.php b/apps/comments/lib/Activity/Listener.php
index 76af565cf1..1dec28c825 100644
--- a/apps/comments/lib/Activity/Listener.php
+++ b/apps/comments/lib/Activity/Listener.php
@@ -77,7 +77,7 @@ class Listener {
 	 */
 	public function commentEvent(CommentsEvent $event) {
 		if ($event->getComment()->getObjectType() !== 'files'
-			|| !in_array($event->getEvent(), [CommentsEvent::EVENT_ADD])
+			|| $event->getEvent() !== CommentsEvent::EVENT_ADD
 			|| !$this->appManager->isInstalled('activity')) {
 			// Comment not for file, not adding a comment or no activity-app enabled (save the energy)
 			return;
diff --git a/apps/dav/lib/CalDAV/CalDavBackend.php b/apps/dav/lib/CalDAV/CalDavBackend.php
index 169bf6ff6a..a936cb6aeb 100644
--- a/apps/dav/lib/CalDAV/CalDavBackend.php
+++ b/apps/dav/lib/CalDAV/CalDavBackend.php
@@ -2261,7 +2261,7 @@ class CalDavBackend extends AbstractBackend implements SyncSupport, Subscription
 					$query->execute();
 				}
 
-				if (in_array($property->name, array_keys(self::$indexParameters))) {
+				if (array_key_exists($property->name, self::$indexParameters)) {
 					$parameters = $property->parameters();
 					$indexedParametersForProperty = self::$indexParameters[$property->name];
 
diff --git a/apps/files_sharing/lib/Migration/OwncloudGuestShareType.php b/apps/files_sharing/lib/Migration/OwncloudGuestShareType.php
index 07f739fb70..33812c5a43 100644
--- a/apps/files_sharing/lib/Migration/OwncloudGuestShareType.php
+++ b/apps/files_sharing/lib/Migration/OwncloudGuestShareType.php
@@ -75,7 +75,7 @@ class OwncloudGuestShareType implements IRepairStep {
 
 	protected function shouldRun() {
 		$appVersion = $this->config->getAppValue('files_sharing', 'installed_version', '0.0.0');
-		return in_array($appVersion, ['0.10.0']) ||
+		return $appVersion === '0.10.0' ||
 			$this->config->getAppValue('core', 'vendor', '') === 'owncloud';
 	}