diff --git a/lib/Config.php b/lib/Config.php
index 20e6ff6954..b5258674d3 100644
--- a/lib/Config.php
+++ b/lib/Config.php
@@ -295,19 +295,19 @@ class Config {
 
 	protected function getWebSocketDomainForSignalingServer(string $url): string {
 		$url .= '/';
-		if (strpos($url, 'https://') === 0) {
+		if (str_starts_with($url, 'https://')) {
 			return 'wss://' . substr($url, 8, strpos($url, '/', 9) - 8);
 		}
 
-		if (strpos($url, 'http://') === 0) {
+		if (str_starts_with($url, 'http://')) {
 			return 'ws://' . substr($url, 7, strpos($url, '/', 8) - 7);
 		}
 
-		if (strpos($url, 'wss://') === 0) {
+		if (str_starts_with($url, 'wss://')) {
 			return substr($url, 0, strpos($url, '/', 7));
 		}
 
-		if (strpos($url, 'ws://') === 0) {
+		if (str_starts_with($url, 'ws://')) {
 			return substr($url, 0, strpos($url, '/', 6));
 		}
 
@@ -509,7 +509,7 @@ class Config {
 			return;
 		}
 
-		if (substr($alg, 0, 2) === 'ES') {
+		if (str_starts_with($alg, 'ES')) {
 			$privKey = openssl_pkey_new([
 				'curve_name' => 'prime256v1',
 				'private_key_bits' => 2048,
@@ -520,7 +520,7 @@ class Config {
 			if (!openssl_pkey_export($privKey, $secret)) {
 				throw new \Exception('Could not export private key');
 			}
-		} elseif (substr($alg, 0, 2) === 'RS') {
+		} elseif (str_starts_with($alg, 'RS')) {
 			$privKey = openssl_pkey_new([
 				'private_key_bits' => 2048,
 				'private_key_type' => OPENSSL_KEYTYPE_RSA,
diff --git a/lib/Controller/SignalingController.php b/lib/Controller/SignalingController.php
index 1da09a0b90..52850f71c1 100644
--- a/lib/Controller/SignalingController.php
+++ b/lib/Controller/SignalingController.php
@@ -235,11 +235,11 @@ class SignalingController extends OCSController {
 		$url = rtrim($signalingServers[$serverId]['server'], '/');
 		$url = strtolower($url);
 
-		if (strpos($url, 'wss://') === 0) {
+		if (str_starts_with($url, 'wss://')) {
 			$url = 'https://' . substr($url, 6);
 		}
 
-		if (strpos($url, 'ws://') === 0) {
+		if (str_starts_with($url, 'ws://')) {
 			$url = 'http://' . substr($url, 5);
 		}
 
diff --git a/lib/Deck/DeckPluginLoader.php b/lib/Deck/DeckPluginLoader.php
index ac7db96ab5..88e880086a 100644
--- a/lib/Deck/DeckPluginLoader.php
+++ b/lib/Deck/DeckPluginLoader.php
@@ -48,7 +48,7 @@ class DeckPluginLoader implements IEventListener {
 			return;
 		}
 
-		if (strpos($this->request->getPathInfo(), '/apps/deck') === 0) {
+		if (str_starts_with($this->request->getPathInfo(), '/apps/deck')) {
 			Util::addScript('spreed', 'talk-collections');
 			Util::addScript('spreed', 'talk-deck');
 		}
diff --git a/lib/Flow/Operation.php b/lib/Flow/Operation.php
index aa185d6fab..bcc165752b 100644
--- a/lib/Flow/Operation.php
+++ b/lib/Flow/Operation.php
@@ -159,7 +159,7 @@ class Operation implements IOperation {
 			case self::MESSAGE_MODES['ROOM_MENTION']:
 				return '@all ';
 			case self::MESSAGE_MODES['SELF_MENTION']:
-				$hasWhitespace = strpos($participant->getAttendee()->getActorId(), ' ') !== false;
+				$hasWhitespace = str_contains($participant->getAttendee()->getActorId(), ' ');
 				$enclosure = $hasWhitespace ? '"' : '';
 				return '@' . $enclosure . $participant->getAttendee()->getActorId() . $enclosure . ' ';
 			case self::MESSAGE_MODES['NO_MENTION']:
diff --git a/lib/Maps/MapsPluginLoader.php b/lib/Maps/MapsPluginLoader.php
index 039b367599..7cd94a89ab 100644
--- a/lib/Maps/MapsPluginLoader.php
+++ b/lib/Maps/MapsPluginLoader.php
@@ -58,7 +58,7 @@ class MapsPluginLoader implements IEventListener {
 			return;
 		}
 
-		if (strpos($this->request->getPathInfo(), '/apps/maps') === 0) {
+		if (str_starts_with($this->request->getPathInfo(), '/apps/maps')) {
 			Util::addScript('spreed', 'talk-collections');
 			Util::addScript('spreed', 'talk-maps');
 		}
diff --git a/lib/Migration/FixNamespaceInDatabaseTables.php b/lib/Migration/FixNamespaceInDatabaseTables.php
index 5e8f98b2f7..d62803968f 100644
--- a/lib/Migration/FixNamespaceInDatabaseTables.php
+++ b/lib/Migration/FixNamespaceInDatabaseTables.php
@@ -54,7 +54,7 @@ class FixNamespaceInDatabaseTables implements IRepairStep {
 		$result = $query->executeQuery();
 		while ($row = $result->fetch()) {
 			$oldClass = $row['class'];
-			if (strpos($oldClass, 'OCA\\Spreed\\') !== 0) {
+			if (!str_starts_with($oldClass, 'OCA\\Spreed\\')) {
 				continue;
 			}
 
diff --git a/lib/Recording/BackendNotifier.php b/lib/Recording/BackendNotifier.php
index e8d746dded..ee67b3a9c5 100644
--- a/lib/Recording/BackendNotifier.php
+++ b/lib/Recording/BackendNotifier.php
@@ -103,9 +103,9 @@ class BackendNotifier {
 
 		$url = '/api/v1/room/' . $room->getToken();
 		$url = $recording['server'] . $url;
-		if (strpos($url, 'wss://') === 0) {
+		if (str_starts_with($url, 'wss://')) {
 			$url = 'https://' . substr($url, 6);
-		} elseif (strpos($url, 'ws://') === 0) {
+		} elseif (str_starts_with($url, 'ws://')) {
 			$url = 'http://' . substr($url, 5);
 		}
 		$body = json_encode($data);
diff --git a/lib/Room.php b/lib/Room.php
index c16a98680b..381d0ff547 100644
--- a/lib/Room.php
+++ b/lib/Room.php
@@ -257,7 +257,7 @@ class Room {
 				/** @var RoomService $roomService */
 				$roomService = Server::get(RoomService::class);
 				$roomService->setName($this, json_encode($users), '');
-			} elseif (strpos($this->name, '["') !== 0) {
+			} elseif (!str_starts_with($this->name, '["')) {
 				// TODO use DI
 				$participantService = Server::get(ParticipantService::class);
 				// Not the json array, but the old fallback when someone left
diff --git a/lib/Search/ConversationSearch.php b/lib/Search/ConversationSearch.php
index 0e3dbc688a..775c5861e0 100644
--- a/lib/Search/ConversationSearch.php
+++ b/lib/Search/ConversationSearch.php
@@ -65,7 +65,7 @@ class ConversationSearch implements IProvider {
 	 * @inheritDoc
 	 */
 	public function getOrder(string $route, array $routeParameters): int {
-		if (strpos($route, Application::APP_ID . '.') === 0) {
+		if (str_starts_with($route, Application::APP_ID . '.')) {
 			// Active app, prefer Talk results
 			return -1;
 		}
@@ -88,7 +88,7 @@ class ConversationSearch implements IProvider {
 			$parameters = $query->getRouteParameters();
 			if (isset($parameters['token']) &&
 				$parameters['token'] === $room->getToken() &&
-				strpos($query->getRoute(), Application::APP_ID . '.') === 0) {
+				str_starts_with($query->getRoute(), Application::APP_ID . '.')) {
 				// Don't search the current conversation.
 				//User most likely looks for other things with the same name
 				continue;
diff --git a/lib/Search/MessageSearch.php b/lib/Search/MessageSearch.php
index abfdcddada..c7af503343 100644
--- a/lib/Search/MessageSearch.php
+++ b/lib/Search/MessageSearch.php
@@ -76,7 +76,7 @@ class MessageSearch implements IProvider, IFilteringProvider {
 	 * @inheritDoc
 	 */
 	public function getOrder(string $route, array $routeParameters): ?int {
-		if (strpos($route, Application::APP_ID . '.') === 0) {
+		if (str_starts_with($route, Application::APP_ID . '.')) {
 			// Active app, prefer Talk results
 			return -2;
 		}
diff --git a/lib/Service/CommandService.php b/lib/Service/CommandService.php
index 86014c59ed..a01b04d44e 100644
--- a/lib/Service/CommandService.php
+++ b/lib/Service/CommandService.php
@@ -127,7 +127,7 @@ class CommandService {
 
 		if ($command->getApp() === '' || $command->getApp() === null) {
 			$script = $command->getScript();
-			if (strpos($script, 'alias:') === 0) {
+			if (str_starts_with($script, 'alias:')) {
 				try {
 					$this->resolveAlias($command);
 				} catch (DoesNotExistException $e) {
@@ -137,7 +137,7 @@ class CommandService {
 				if (preg_match('/[`\'"]{(?:ARGUMENTS|ROOM|USER)}[`\'"]/i', $script)) {
 					throw new \InvalidArgumentException('script-parameters', 6);
 				}
-				if (strpos($script, '{ARGUMENTS_DOUBLEQUOTE_ESCAPED}') !== false) {
+				if (str_contains($script, '{ARGUMENTS_DOUBLEQUOTE_ESCAPED}')) {
 					throw new \InvalidArgumentException('script-parameters', 6);
 				}
 
@@ -165,7 +165,7 @@ class CommandService {
 	 */
 	public function resolveAlias(Command $command): Command {
 		$script = $command->getScript();
-		if (strpos($script, 'alias:') === 0) {
+		if (str_starts_with($script, 'alias:')) {
 			$alias = explode(':', $script, 3);
 			if (isset($alias[2])) {
 				[, $app, $cmd] = $alias;
diff --git a/lib/Settings/Admin/AdminSettings.php b/lib/Settings/Admin/AdminSettings.php
index fe98011e0d..8aef0a6d39 100644
--- a/lib/Settings/Admin/AdminSettings.php
+++ b/lib/Settings/Admin/AdminSettings.php
@@ -411,7 +411,7 @@ class AdminSettings implements ISettings {
 		}
 		$userLocale = $this->serverConfig->getUserValue($this->currentUser->getUID(), 'core', 'locale', 'en_US');
 		$guessCountry = 'US';
-		if (strpos($userLocale, '_') !== false) {
+		if (str_contains($userLocale, '_')) {
 			$guessCountry = substr($userLocale, strrpos($userLocale, '_') + 1);
 			$correctGuess = false;
 			foreach ($countries as $country) {
@@ -519,11 +519,11 @@ class AdminSettings implements ISettings {
 
 		if ($usingFPM) {
 			// Needs to use mpm_event
-			return strpos($apacheModule, 'event') !== false ? '' : 'invalid';
+			return str_contains($apacheModule, 'event') ? '' : 'invalid';
 		}
 
 		// Needs to use mpm_prefork
-		return strpos($apacheModule, 'prefork') !== false ? '' : 'invalid';
+		return str_contains($apacheModule, 'prefork') ? '' : 'invalid';
 	}
 
 	/**
diff --git a/lib/Signaling/BackendNotifier.php b/lib/Signaling/BackendNotifier.php
index fc19ecc177..61d6d8dff2 100644
--- a/lib/Signaling/BackendNotifier.php
+++ b/lib/Signaling/BackendNotifier.php
@@ -122,9 +122,9 @@ class BackendNotifier {
 
 		$url = '/api/v1/room/' . $room->getToken();
 		$url = $signaling['server'] . $url;
-		if (strpos($url, 'wss://') === 0) {
+		if (str_starts_with($url, 'wss://')) {
 			$url = 'https://' . substr($url, 6);
-		} elseif (strpos($url, 'ws://') === 0) {
+		} elseif (str_starts_with($url, 'ws://')) {
 			$url = 'http://' . substr($url, 5);
 		}
 		$body = json_encode($data);