diff --git a/lib/private/Accounts/AccountManager.php b/lib/private/Accounts/AccountManager.php
index 8fc16d5ce1a..1d64d604578 100644
--- a/lib/private/Accounts/AccountManager.php
+++ b/lib/private/Accounts/AccountManager.php
@@ -176,7 +176,7 @@ class AccountManager implements IAccountManager {
 
 		if ($defaultRegion === '') {
 			// When no default region is set, only +49… numbers are valid
-			if (strpos($input, '+') !== 0) {
+			if (!str_starts_with($input, '+')) {
 				throw new InvalidArgumentException(self::PROPERTY_PHONE);
 			}
 
diff --git a/lib/private/Accounts/AccountProperty.php b/lib/private/Accounts/AccountProperty.php
index a8e195feb98..2023d185a4b 100644
--- a/lib/private/Accounts/AccountProperty.php
+++ b/lib/private/Accounts/AccountProperty.php
@@ -145,7 +145,7 @@ class AccountProperty implements IAccountProperty {
 	}
 
 	public static function mapScopeToV2(string $scope): string {
-		if (strpos($scope, 'v2-') === 0) {
+		if (str_starts_with($scope, 'v2-')) {
 			return $scope;
 		}
 
diff --git a/lib/private/App/AppStore/Fetcher/AppFetcher.php b/lib/private/App/AppStore/Fetcher/AppFetcher.php
index 35bec10f5ae..47bdece372d 100644
--- a/lib/private/App/AppStore/Fetcher/AppFetcher.php
+++ b/lib/private/App/AppStore/Fetcher/AppFetcher.php
@@ -99,7 +99,7 @@ class AppFetcher extends Fetcher {
 			foreach ($app['releases'] as $release) {
 				// Exclude all nightly and pre-releases if required
 				if (($allowNightly || $release['isNightly'] === false)
-					&& ($allowPreReleases || strpos($release['version'], '-') === false)) {
+					&& ($allowPreReleases || !str_contains($release['version'], '-'))) {
 					// Exclude all versions not compatible with the current version
 					try {
 						$versionParser = new VersionParser();
diff --git a/lib/private/App/AppStore/Version/VersionParser.php b/lib/private/App/AppStore/Version/VersionParser.php
index 6a369b1cb6e..2b88399b9fd 100644
--- a/lib/private/App/AppStore/Version/VersionParser.php
+++ b/lib/private/App/AppStore/Version/VersionParser.php
@@ -64,7 +64,7 @@ class VersionParser {
 				if (!$this->isValidVersionString($firstVersionNumber)) {
 					break;
 				}
-				if (strpos($firstVersion, '>') === 0) {
+				if (str_starts_with($firstVersion, '>')) {
 					return new Version($firstVersionNumber, '');
 				}
 				return new Version('', $firstVersionNumber);
diff --git a/lib/private/App/DependencyAnalyzer.php b/lib/private/App/DependencyAnalyzer.php
index aa136f0e965..3bdc551ea5a 100644
--- a/lib/private/App/DependencyAnalyzer.php
+++ b/lib/private/App/DependencyAnalyzer.php
@@ -383,7 +383,7 @@ class DependencyAnalyzer {
 			case '9.1':
 				return '10';
 			default:
-				if (strpos($version, '9.1.') === 0) {
+				if (str_starts_with($version, '9.1.')) {
 					$version = '10.0.' . substr($version, 4);
 				}
 				return $version;
diff --git a/lib/private/AppFramework/App.php b/lib/private/AppFramework/App.php
index abf8a08a44b..0cbe47b75a5 100644
--- a/lib/private/AppFramework/App.php
+++ b/lib/private/AppFramework/App.php
@@ -91,12 +91,12 @@ class App {
 	}
 
 	public static function getAppIdForClass(string $className, string $topNamespace = 'OCA\\'): ?string {
-		if (strpos($className, $topNamespace) !== 0) {
+		if (!str_starts_with($className, $topNamespace)) {
 			return null;
 		}
 
 		foreach (self::$nameSpaceCache as $appId => $namespace) {
-			if (strpos($className, $topNamespace . $namespace . '\\') === 0) {
+			if (str_starts_with($className, $topNamespace . $namespace . '\\')) {
 				return $appId;
 			}
 		}
@@ -147,7 +147,7 @@ class App {
 		try {
 			$controller = $container->get($controllerName);
 		} catch (QueryException $e) {
-			if (strpos($controllerName, '\\Controller\\') !== false) {
+			if (str_contains($controllerName, '\\Controller\\')) {
 				// This is from a global registered app route that is not enabled.
 				[/*OC(A)*/, $app, /* Controller/Name*/] = explode('\\', $controllerName, 3);
 				throw new HintException('App ' . strtolower($app) . ' is not enabled');
diff --git a/lib/private/AppFramework/Http/Dispatcher.php b/lib/private/AppFramework/Http/Dispatcher.php
index b4b03574d56..13b391eb287 100644
--- a/lib/private/AppFramework/Http/Dispatcher.php
+++ b/lib/private/AppFramework/Http/Dispatcher.php
@@ -212,8 +212,8 @@ class Dispatcher {
 				$value === 'false' &&
 				(
 					$this->request->method === 'GET' ||
-					strpos($this->request->getHeader('Content-Type'),
-						'application/x-www-form-urlencoded') !== false
+					str_contains($this->request->getHeader('Content-Type'),
+						'application/x-www-form-urlencoded')
 				)
 			) {
 				$value = false;
diff --git a/lib/private/AppFramework/Http/Request.php b/lib/private/AppFramework/Http/Request.php
index 52abb909b60..408e88583a0 100644
--- a/lib/private/AppFramework/Http/Request.php
+++ b/lib/private/AppFramework/Http/Request.php
@@ -413,8 +413,8 @@ class Request implements \ArrayAccess, \Countable, IRequest {
 		return $this->method === 'PUT'
 			&& $this->getHeader('Content-Length') !== '0'
 			&& $this->getHeader('Content-Length') !== ''
-			&& strpos($this->getHeader('Content-Type'), 'application/x-www-form-urlencoded') === false
-			&& strpos($this->getHeader('Content-Type'), 'application/json') === false;
+			&& !str_contains($this->getHeader('Content-Type'), 'application/x-www-form-urlencoded')
+			&& !str_contains($this->getHeader('Content-Type'), 'application/json');
 	}
 
 	/**
@@ -439,7 +439,7 @@ class Request implements \ArrayAccess, \Countable, IRequest {
 		// or post correctly
 		} elseif ($this->method !== 'GET'
 				&& $this->method !== 'POST'
-				&& strpos($this->getHeader('Content-Type'), 'application/x-www-form-urlencoded') !== false) {
+				&& str_contains($this->getHeader('Content-Type'), 'application/x-www-form-urlencoded')) {
 			parse_str(file_get_contents($this->inputStream), $params);
 			if (\is_array($params)) {
 				$this->items['params'] = $params;
@@ -603,7 +603,7 @@ class Request implements \ArrayAccess, \Countable, IRequest {
 						$IP = trim($IP);
 
 						// remove brackets from IPv6 addresses
-						if (strpos($IP, '[') === 0 && substr($IP, -1) === ']') {
+						if (str_starts_with($IP, '[') && str_ends_with($IP, ']')) {
 							$IP = substr($IP, 1, -1);
 						}
 
@@ -642,7 +642,7 @@ class Request implements \ArrayAccess, \Countable, IRequest {
 		}
 
 		if ($this->fromTrustedProxy() && isset($this->server['HTTP_X_FORWARDED_PROTO'])) {
-			if (strpos($this->server['HTTP_X_FORWARDED_PROTO'], ',') !== false) {
+			if (str_contains($this->server['HTTP_X_FORWARDED_PROTO'], ',')) {
 				$parts = explode(',', $this->server['HTTP_X_FORWARDED_PROTO']);
 				$proto = strtolower(trim($parts[0]));
 			} else {
@@ -724,7 +724,7 @@ class Request implements \ArrayAccess, \Countable, IRequest {
 		// FIXME: Sabre does not really belong here
 		[$path, $name] = \Sabre\Uri\split($scriptName);
 		if (!empty($path)) {
-			if ($path === $pathInfo || strpos($pathInfo, $path.'/') === 0) {
+			if ($path === $pathInfo || str_starts_with($pathInfo, $path . '/')) {
 				$pathInfo = substr($pathInfo, \strlen($path));
 			} else {
 				throw new \Exception("The requested uri($requestUri) cannot be processed by the script '$scriptName')");
@@ -734,10 +734,10 @@ class Request implements \ArrayAccess, \Countable, IRequest {
 			$name = '';
 		}
 
-		if (strpos($pathInfo, '/'.$name) === 0) {
+		if (str_starts_with($pathInfo, '/' . $name)) {
 			$pathInfo = substr($pathInfo, \strlen($name) + 1);
 		}
-		if ($name !== '' && strpos($pathInfo, $name) === 0) {
+		if ($name !== '' && str_starts_with($pathInfo, $name)) {
 			$pathInfo = substr($pathInfo, \strlen($name));
 		}
 		if ($pathInfo === false || $pathInfo === '/') {
@@ -803,7 +803,7 @@ class Request implements \ArrayAccess, \Countable, IRequest {
 
 		$host = 'localhost';
 		if ($this->fromTrustedProxy() && isset($this->server['HTTP_X_FORWARDED_HOST'])) {
-			if (strpos($this->server['HTTP_X_FORWARDED_HOST'], ',') !== false) {
+			if (str_contains($this->server['HTTP_X_FORWARDED_HOST'], ',')) {
 				$parts = explode(',', $this->server['HTTP_X_FORWARDED_HOST']);
 				$host = trim(current($parts));
 			} else {
diff --git a/lib/private/AppFramework/Middleware/CompressionMiddleware.php b/lib/private/AppFramework/Middleware/CompressionMiddleware.php
index 530c270c7bc..b1b89832b00 100644
--- a/lib/private/AppFramework/Middleware/CompressionMiddleware.php
+++ b/lib/private/AppFramework/Middleware/CompressionMiddleware.php
@@ -57,7 +57,7 @@ class CompressionMiddleware extends Middleware {
 
 		// Check if we are even asked for gzip
 		$header = $this->request->getHeader('Accept-Encoding');
-		if (strpos($header, 'gzip') === false) {
+		if (!str_contains($header, 'gzip')) {
 			return $response;
 		}
 
diff --git a/lib/private/AppFramework/Middleware/Security/SecurityMiddleware.php b/lib/private/AppFramework/Middleware/Security/SecurityMiddleware.php
index 8e0794f9645..04f79361bc8 100644
--- a/lib/private/AppFramework/Middleware/Security/SecurityMiddleware.php
+++ b/lib/private/AppFramework/Middleware/Security/SecurityMiddleware.php
@@ -218,7 +218,7 @@ class SecurityMiddleware extends Middleware {
 			if (!$this->request->passesCSRFCheck() && !(
 				$controller instanceof OCSController && (
 					$this->request->getHeader('OCS-APIREQUEST') === 'true' ||
-					strpos($this->request->getHeader('Authorization'), 'Bearer ') === 0
+					str_starts_with($this->request->getHeader('Authorization'), 'Bearer ')
 				)
 			)) {
 				throw new CrossSiteRequestForgeryException();
diff --git a/lib/private/AppFramework/OCS/BaseResponse.php b/lib/private/AppFramework/OCS/BaseResponse.php
index d3904065102..1191b861278 100644
--- a/lib/private/AppFramework/OCS/BaseResponse.php
+++ b/lib/private/AppFramework/OCS/BaseResponse.php
@@ -134,7 +134,7 @@ abstract class BaseResponse extends Response {
 				continue;
 			}
 
-			if (\is_string($k) && strpos($k, '@') === 0) {
+			if (\is_string($k) && str_starts_with($k, '@')) {
 				$writer->writeAttribute(substr($k, 1), $v);
 				continue;
 			}
diff --git a/lib/private/Cache/File.php b/lib/private/Cache/File.php
index 1f63e462bb5..72fc95a802b 100644
--- a/lib/private/Cache/File.php
+++ b/lib/private/Cache/File.php
@@ -160,7 +160,7 @@ class File implements ICache {
 			$dh = $storage->opendir('/');
 			if (is_resource($dh)) {
 				while (($file = readdir($dh)) !== false) {
-					if ($file != '.' and $file != '..' and ($prefix === '' || strpos($file, $prefix) === 0)) {
+					if ($file != '.' and $file != '..' and ($prefix === '' || str_starts_with($file, $prefix))) {
 						$storage->unlink('/' . $file);
 					}
 				}
diff --git a/lib/private/Collaboration/Collaborators/Search.php b/lib/private/Collaboration/Collaborators/Search.php
index b0ee09356af..8d99ed42fcd 100644
--- a/lib/private/Collaboration/Collaborators/Search.php
+++ b/lib/private/Collaboration/Collaborators/Search.php
@@ -97,7 +97,7 @@ class Search implements ISearch {
 		// if we have an exact local user match with an email-a-like query,
 		// there is no need to show the remote and email matches.
 		$userType = new SearchResultType('users');
-		if (strpos($search, '@') !== false && $searchResult->hasExactIdMatch($userType)) {
+		if (str_contains($search, '@') && $searchResult->hasExactIdMatch($userType)) {
 			$searchResult->unsetResult($remoteType);
 			$searchResult->unsetResult($emailType);
 		}
diff --git a/lib/private/Comments/Comment.php b/lib/private/Comments/Comment.php
index f9e5c166872..4284beb3fcc 100644
--- a/lib/private/Comments/Comment.php
+++ b/lib/private/Comments/Comment.php
@@ -240,9 +240,9 @@ class Comment implements IComment {
 		$result = [];
 		foreach ($mentionIds as $mentionId) {
 			$cleanId = trim(substr($mentionId, 1), '"');
-			if (strpos($cleanId, 'guest/') === 0) {
+			if (str_starts_with($cleanId, 'guest/')) {
 				$result[] = ['type' => 'guest', 'id' => $cleanId];
-			} elseif (strpos($cleanId, 'group/') === 0) {
+			} elseif (str_starts_with($cleanId, 'group/')) {
 				$result[] = ['type' => 'group', 'id' => substr($cleanId, 6)];
 			} else {
 				$result[] = ['type' => 'user', 'id' => $cleanId];
diff --git a/lib/private/Contacts/ContactsMenu/ContactsStore.php b/lib/private/Contacts/ContactsMenu/ContactsStore.php
index 3a75e924d24..e4dd80645ea 100644
--- a/lib/private/Contacts/ContactsMenu/ContactsStore.php
+++ b/lib/private/Contacts/ContactsMenu/ContactsStore.php
@@ -302,7 +302,7 @@ class ContactsStore implements IContactsStore {
 		}
 
 		$avatarPrefix = "VALUE=uri:";
-		if (isset($contact['PHOTO']) && strpos($contact['PHOTO'], $avatarPrefix) === 0) {
+		if (isset($contact['PHOTO']) && str_starts_with($contact['PHOTO'], $avatarPrefix)) {
 			$entry->setAvatar(substr($contact['PHOTO'], strlen($avatarPrefix)));
 		}
 
diff --git a/lib/private/DB/MySqlTools.php b/lib/private/DB/MySqlTools.php
index b78db32eb53..b129aefec08 100644
--- a/lib/private/DB/MySqlTools.php
+++ b/lib/private/DB/MySqlTools.php
@@ -63,7 +63,7 @@ class MySqlTools {
 			return false;
 		}
 
-		return strpos($row, 'maria') && version_compare($row, '10.3', '>=') ||
-			strpos($row, 'maria') === false && version_compare($row, '8.0', '>=');
+		return str_contains($row, 'maria') && version_compare($row, '10.3', '>=') ||
+			!str_contains($row, 'maria') && version_compare($row, '8.0', '>=');
 	}
 }
diff --git a/lib/private/DB/QueryBuilder/QueryBuilder.php b/lib/private/DB/QueryBuilder/QueryBuilder.php
index 43ed68f5616..2f97b4a146c 100644
--- a/lib/private/DB/QueryBuilder/QueryBuilder.php
+++ b/lib/private/DB/QueryBuilder/QueryBuilder.php
@@ -1321,7 +1321,7 @@ class QueryBuilder implements IQueryBuilder {
 	 * @return string
 	 */
 	protected function prefixTableName($table) {
-		if ($this->automaticTablePrefix === false || strpos($table, '*PREFIX*') === 0) {
+		if ($this->automaticTablePrefix === false || str_starts_with($table, '*PREFIX*')) {
 			return $table;
 		}
 
diff --git a/lib/private/DB/SchemaWrapper.php b/lib/private/DB/SchemaWrapper.php
index 31b74014a98..9dae9ab6248 100644
--- a/lib/private/DB/SchemaWrapper.php
+++ b/lib/private/DB/SchemaWrapper.php
@@ -62,7 +62,7 @@ class SchemaWrapper implements ISchemaWrapper {
 	public function getTableNamesWithoutPrefix() {
 		$tableNames = $this->schema->getTableNames();
 		return array_map(function ($tableName) {
-			if (strpos($tableName, $this->connection->getPrefix()) === 0) {
+			if (str_starts_with($tableName, $this->connection->getPrefix())) {
 				return substr($tableName, strlen($this->connection->getPrefix()));
 			}
 
diff --git a/lib/private/Encryption/Util.php b/lib/private/Encryption/Util.php
index 6ae0006e955..a468908ffc8 100644
--- a/lib/private/Encryption/Util.php
+++ b/lib/private/Encryption/Util.php
@@ -311,10 +311,7 @@ class Util {
 			// detect alternative key storage root
 			$rootDir = $this->getKeyStorageRoot();
 			if ($rootDir !== '' &&
-				0 === strpos(
-					Filesystem::normalizePath($path),
-					Filesystem::normalizePath($rootDir)
-				)
+				str_starts_with(Filesystem::normalizePath($path), Filesystem::normalizePath($rootDir))
 			) {
 				return true;
 			}
diff --git a/lib/private/Federation/CloudIdManager.php b/lib/private/Federation/CloudIdManager.php
index 85aae8e5ec5..01e00c01181 100644
--- a/lib/private/Federation/CloudIdManager.php
+++ b/lib/private/Federation/CloudIdManager.php
@@ -81,7 +81,7 @@ class CloudIdManager implements ICloudIdManager {
 		if ($event instanceof CardUpdatedEvent) {
 			$data = $event->getCardData()['carddata'];
 			foreach (explode("\r\n", $data) as $line) {
-				if (strpos($line, "CLOUD;") === 0) {
+				if (str_starts_with($line, "CLOUD;")) {
 					$parts = explode(':', $line, 2);
 					if (isset($parts[1])) {
 						$key = $parts[1];
@@ -210,9 +210,9 @@ class CloudIdManager implements ICloudIdManager {
 	 * @return string
 	 */
 	private function removeProtocolFromUrl($url) {
-		if (strpos($url, 'https://') === 0) {
+		if (str_starts_with($url, 'https://')) {
 			return substr($url, strlen('https://'));
-		} elseif (strpos($url, 'http://') === 0) {
+		} elseif (str_starts_with($url, 'http://')) {
 			return substr($url, strlen('http://'));
 		}
 
@@ -246,6 +246,6 @@ class CloudIdManager implements ICloudIdManager {
 	 * @return bool
 	 */
 	public function isValidCloudId(string $cloudId): bool {
-		return strpos($cloudId, '@') !== false;
+		return str_contains($cloudId, '@');
 	}
 }
diff --git a/lib/private/Files/Cache/Cache.php b/lib/private/Files/Cache/Cache.php
index 933fee5630f..f085f8ade5e 100644
--- a/lib/private/Files/Cache/Cache.php
+++ b/lib/private/Files/Cache/Cache.php
@@ -836,7 +836,7 @@ class Cache implements ICache {
 	 * @return ICacheEntry[] an array of cache entries where the mimetype matches the search
 	 */
 	public function searchByMime($mimetype) {
-		if (strpos($mimetype, '/') === false) {
+		if (!str_contains($mimetype, '/')) {
 			$operator = new SearchComparison(ISearchComparison::COMPARE_LIKE, 'mimetype', $mimetype . '/%');
 		} else {
 			$operator = new SearchComparison(ISearchComparison::COMPARE_EQUAL, 'mimetype', $mimetype);
diff --git a/lib/private/Files/Cache/LocalRootScanner.php b/lib/private/Files/Cache/LocalRootScanner.php
index 0b6bc497ea3..df5ddd0075b 100644
--- a/lib/private/Files/Cache/LocalRootScanner.php
+++ b/lib/private/Files/Cache/LocalRootScanner.php
@@ -44,6 +44,6 @@ class LocalRootScanner extends Scanner {
 
 	private function shouldScanPath(string $path): bool {
 		$path = trim($path, '/');
-		return $path === '' || strpos($path, 'appdata_') === 0 || strpos($path, '__groupfolders') === 0;
+		return $path === '' || str_starts_with($path, 'appdata_') || str_starts_with($path, '__groupfolders');
 	}
 }
diff --git a/lib/private/Files/Cache/Propagator.php b/lib/private/Files/Cache/Propagator.php
index 70fc238d9be..327d0d80bf2 100644
--- a/lib/private/Files/Cache/Propagator.php
+++ b/lib/private/Files/Cache/Propagator.php
@@ -71,7 +71,7 @@ class Propagator implements IPropagator {
 	public function propagateChange($internalPath, $time, $sizeDifference = 0) {
 		// Do not propagate changes in ignored paths
 		foreach ($this->ignore as $ignore) {
-			if (strpos($internalPath, $ignore) === 0) {
+			if (str_starts_with($internalPath, $ignore)) {
 				return;
 			}
 		}
diff --git a/lib/private/Files/Cache/Scanner.php b/lib/private/Files/Cache/Scanner.php
index e3a08264716..a34f1db3195 100644
--- a/lib/private/Files/Cache/Scanner.php
+++ b/lib/private/Files/Cache/Scanner.php
@@ -521,7 +521,7 @@ class Scanner extends BasicEmitter implements IScanner {
 		if (pathinfo($file, PATHINFO_EXTENSION) === 'part') {
 			return true;
 		}
-		if (strpos($file, '.part/') !== false) {
+		if (str_contains($file, '.part/')) {
 			return true;
 		}
 
diff --git a/lib/private/Files/Cache/SearchBuilder.php b/lib/private/Files/Cache/SearchBuilder.php
index 63dc4b9cd0e..c9f35ccd095 100644
--- a/lib/private/Files/Cache/SearchBuilder.php
+++ b/lib/private/Files/Cache/SearchBuilder.php
@@ -152,7 +152,7 @@ class SearchBuilder {
 					$field = 'mimepart';
 					$value = (int)$this->mimetypeLoader->getId($matches[1]);
 					$type = ISearchComparison::COMPARE_EQUAL;
-				} elseif (strpos($value, '%') !== false) {
+				} elseif (str_contains($value, '%')) {
 					throw new \InvalidArgumentException('Unsupported query value for mimetype: ' . $value . ', only values in the format "mime/type" or "mime/%" are supported');
 				} else {
 					$field = 'mimetype';
diff --git a/lib/private/Files/Cache/Wrapper/CacheJail.php b/lib/private/Files/Cache/Wrapper/CacheJail.php
index a5075ceef86..2885a8bf5e0 100644
--- a/lib/private/Files/Cache/Wrapper/CacheJail.php
+++ b/lib/private/Files/Cache/Wrapper/CacheJail.php
@@ -328,7 +328,7 @@ class CacheJail extends CacheWrapper {
 	}
 
 	public function getCacheEntryFromSearchResult(ICacheEntry $rawEntry): ?ICacheEntry {
-		if ($this->getGetUnjailedRoot() === '' || strpos($rawEntry->getPath(), $this->getGetUnjailedRoot()) === 0) {
+		if ($this->getGetUnjailedRoot() === '' || str_starts_with($rawEntry->getPath(), $this->getGetUnjailedRoot())) {
 			$rawEntry = $this->getCache()->getCacheEntryFromSearchResult($rawEntry);
 			if ($rawEntry) {
 				$jailedPath = $this->getJailedPath($rawEntry->getPath());
diff --git a/lib/private/Files/Config/UserMountCache.php b/lib/private/Files/Config/UserMountCache.php
index 9838b0a213c..90f94b6598e 100644
--- a/lib/private/Files/Config/UserMountCache.php
+++ b/lib/private/Files/Config/UserMountCache.php
@@ -487,7 +487,7 @@ class UserMountCache implements IUserMountCache {
 		$path = rtrim($path, '/') . '/';
 		$mounts = $this->getMountsForUser($user);
 		return array_filter($mounts, function (ICachedMountInfo $mount) use ($path) {
-			return $mount->getMountPoint() !== $path && strpos($mount->getMountPoint(), $path) === 0;
+			return $mount->getMountPoint() !== $path && str_starts_with($mount->getMountPoint(), $path);
 		});
 	}
 }
diff --git a/lib/private/Files/Filesystem.php b/lib/private/Files/Filesystem.php
index 2eab4c58a0c..5f7c0c403db 100644
--- a/lib/private/Files/Filesystem.php
+++ b/lib/private/Files/Filesystem.php
@@ -451,7 +451,7 @@ class Filesystem {
 		if (!$path || $path[0] !== '/') {
 			$path = '/' . $path;
 		}
-		if (strpos($path, '/../') !== false || strrchr($path, '/') === '/..') {
+		if (str_contains($path, '/../') || strrchr($path, '/') === '/..') {
 			return false;
 		}
 		return true;
diff --git a/lib/private/Files/Mount/MountPoint.php b/lib/private/Files/Mount/MountPoint.php
index 20e08120080..f526928cc15 100644
--- a/lib/private/Files/Mount/MountPoint.php
+++ b/lib/private/Files/Mount/MountPoint.php
@@ -121,7 +121,7 @@ class MountPoint implements IMountPoint {
 			$this->storage = $this->loader->wrap($this, $storage);
 		} else {
 			// Update old classes to new namespace
-			if (strpos($storage, 'OC_Filestorage_') !== false) {
+			if (str_contains($storage, 'OC_Filestorage_')) {
 				$storage = '\OC\Files\Storage\\' . substr($storage, 15);
 			}
 			$this->class = $storage;
diff --git a/lib/private/Files/Mount/RootMountProvider.php b/lib/private/Files/Mount/RootMountProvider.php
index b301fc6dd14..794421181c7 100644
--- a/lib/private/Files/Mount/RootMountProvider.php
+++ b/lib/private/Files/Mount/RootMountProvider.php
@@ -64,7 +64,7 @@ class RootMountProvider implements IRootMountProvider {
 
 		// instantiate object store implementation
 		$name = $config['class'];
-		if (strpos($name, 'OCA\\') === 0 && substr_count($name, '\\') >= 2) {
+		if (str_starts_with($name, 'OCA\\') && substr_count($name, '\\') >= 2) {
 			$segments = explode('\\', $name);
 			OC_App::loadApp(strtolower($segments[1]));
 		}
diff --git a/lib/private/Files/Node/Folder.php b/lib/private/Files/Node/Folder.php
index 1d6d88bafe6..44f47e92ca0 100644
--- a/lib/private/Files/Node/Folder.php
+++ b/lib/private/Files/Node/Folder.php
@@ -88,7 +88,7 @@ class Folder extends Node implements \OCP\Files\Folder {
 	 * @return bool
 	 */
 	public function isSubNode($node) {
-		return strpos($node->getPath(), $this->path . '/') === 0;
+		return str_starts_with($node->getPath(), $this->path . '/');
 	}
 
 	/**
@@ -284,7 +284,7 @@ class Folder extends Node implements \OCP\Files\Folder {
 	 * @return Node[]
 	 */
 	public function searchByMime($mimetype) {
-		if (strpos($mimetype, '/') === false) {
+		if (!str_contains($mimetype, '/')) {
 			$query = $this->queryFromOperator(new SearchComparison(ISearchComparison::COMPARE_LIKE, 'mimetype', $mimetype . '/%'));
 		} else {
 			$query = $this->queryFromOperator(new SearchComparison(ISearchComparison::COMPARE_EQUAL, 'mimetype', $mimetype));
@@ -339,7 +339,7 @@ class Folder extends Node implements \OCP\Files\Folder {
 		$absolutePath = '/' . ltrim($cacheEntry->getPath(), '/');
 		$currentPath = rtrim($this->path, '/') . '/';
 
-		if (strpos($absolutePath, $currentPath) !== 0) {
+		if (!str_starts_with($absolutePath, $currentPath)) {
 			return [];
 		}
 
diff --git a/lib/private/Files/ObjectStore/S3Signature.php b/lib/private/Files/ObjectStore/S3Signature.php
index 64b994bac22..cf3d29c4185 100644
--- a/lib/private/Files/ObjectStore/S3Signature.php
+++ b/lib/private/Files/ObjectStore/S3Signature.php
@@ -107,7 +107,7 @@ class S3Signature implements SignatureInterface {
 		// Move X-Amz-* headers to the query string
 		foreach ($request->getHeaders() as $name => $header) {
 			$name = strtolower($name);
-			if (strpos($name, 'x-amz-') === 0) {
+			if (str_starts_with($name, 'x-amz-')) {
 				$query[$name] = implode(',', $header);
 			}
 		}
@@ -169,7 +169,7 @@ class S3Signature implements SignatureInterface {
 		$headers = [];
 		foreach ($request->getHeaders() as $name => $header) {
 			$name = strtolower($name);
-			if (strpos($name, 'x-amz-') === 0) {
+			if (str_starts_with($name, 'x-amz-')) {
 				$value = implode(',', $header);
 				if (strlen($value) > 0) {
 					$headers[$name] = $name . ':' . $value;
diff --git a/lib/private/Files/SetupManager.php b/lib/private/Files/SetupManager.php
index 01ce4a1cc59..2198c8c60b7 100644
--- a/lib/private/Files/SetupManager.php
+++ b/lib/private/Files/SetupManager.php
@@ -294,7 +294,7 @@ class SetupManager {
 		$userRoot = '/' . $user->getUID() . '/';
 		$mounts = $this->mountManager->getAll();
 		$mounts = array_filter($mounts, function (IMountPoint $mount) use ($userRoot) {
-			return strpos($mount->getMountPoint(), $userRoot) === 0;
+			return str_starts_with($mount->getMountPoint(), $userRoot);
 		});
 		$allProviders = array_map(function (IMountProvider $provider) {
 			return get_class($provider);
@@ -365,7 +365,7 @@ class SetupManager {
 	 * @return IUser|null
 	 */
 	private function getUserForPath(string $path) {
-		if (strpos($path, '/__groupfolders') === 0) {
+		if (str_starts_with($path, '/__groupfolders')) {
 			return null;
 		} elseif (substr_count($path, '/') < 2) {
 			if ($user = $this->userSession->getUser()) {
@@ -373,7 +373,7 @@ class SetupManager {
 			} else {
 				return null;
 			}
-		} elseif (strpos($path, '/appdata_' . \OC_Util::getInstanceId()) === 0 || strpos($path, '/files_external/') === 0) {
+		} elseif (str_starts_with($path, '/appdata_' . \OC_Util::getInstanceId()) || str_starts_with($path, '/files_external/')) {
 			return null;
 		} else {
 			[, $userId] = explode('/', $path);
diff --git a/lib/private/Files/Storage/Common.php b/lib/private/Files/Storage/Common.php
index cd9a05a2a1d..5ab411434d0 100644
--- a/lib/private/Files/Storage/Common.php
+++ b/lib/private/Files/Storage/Common.php
@@ -577,7 +577,7 @@ abstract class Common implements Storage, ILockingStorage, IWriteStreamStorage {
 	 */
 	private function scanForInvalidCharacters($fileName, $invalidChars) {
 		foreach (str_split($invalidChars) as $char) {
-			if (strpos($fileName, $char) !== false) {
+			if (str_contains($fileName, $char)) {
 				throw new InvalidCharacterInPathException();
 			}
 		}
diff --git a/lib/private/Files/Storage/DAV.php b/lib/private/Files/Storage/DAV.php
index b332f3b7c4a..6a05f54a0b4 100644
--- a/lib/private/Files/Storage/DAV.php
+++ b/lib/private/Files/Storage/DAV.php
@@ -769,16 +769,16 @@ class DAV extends Common {
 	 */
 	protected function parsePermissions($permissionsString) {
 		$permissions = Constants::PERMISSION_READ;
-		if (strpos($permissionsString, 'R') !== false) {
+		if (str_contains($permissionsString, 'R')) {
 			$permissions |= Constants::PERMISSION_SHARE;
 		}
-		if (strpos($permissionsString, 'D') !== false) {
+		if (str_contains($permissionsString, 'D')) {
 			$permissions |= Constants::PERMISSION_DELETE;
 		}
-		if (strpos($permissionsString, 'W') !== false) {
+		if (str_contains($permissionsString, 'W')) {
 			$permissions |= Constants::PERMISSION_UPDATE;
 		}
-		if (strpos($permissionsString, 'CK') !== false) {
+		if (str_contains($permissionsString, 'CK')) {
 			$permissions |= Constants::PERMISSION_CREATE;
 			$permissions |= Constants::PERMISSION_UPDATE;
 		}
diff --git a/lib/private/Files/Storage/Wrapper/Encryption.php b/lib/private/Files/Storage/Wrapper/Encryption.php
index 9c0e6c91463..ab3873a7ec0 100644
--- a/lib/private/Files/Storage/Wrapper/Encryption.php
+++ b/lib/private/Files/Storage/Wrapper/Encryption.php
@@ -922,7 +922,7 @@ class Encryption extends Wrapper {
 		}
 		$firstBlock = $this->readFirstBlock($path);
 
-		if (substr($firstBlock, 0, strlen(Util::HEADER_START)) === Util::HEADER_START) {
+		if (str_starts_with($firstBlock, Util::HEADER_START)) {
 			$headerSize = $this->util->getHeaderSize();
 		}
 
@@ -937,7 +937,7 @@ class Encryption extends Wrapper {
 	 */
 	protected function parseRawHeader($rawHeader) {
 		$result = [];
-		if (substr($rawHeader, 0, strlen(Util::HEADER_START)) === Util::HEADER_START) {
+		if (str_starts_with($rawHeader, Util::HEADER_START)) {
 			$header = $rawHeader;
 			$endAt = strpos($header, Util::HEADER_END);
 			if ($endAt !== false) {
diff --git a/lib/private/Files/Storage/Wrapper/Jail.php b/lib/private/Files/Storage/Wrapper/Jail.php
index caf039d4cca..1921ac27848 100644
--- a/lib/private/Files/Storage/Wrapper/Jail.php
+++ b/lib/private/Files/Storage/Wrapper/Jail.php
@@ -72,7 +72,7 @@ class Jail extends Wrapper {
 	public function getJailedPath($path) {
 		$root = rtrim($this->rootPath, '/') . '/';
 
-		if ($path !== $this->rootPath && strpos($path, $root) !== 0) {
+		if ($path !== $this->rootPath && !str_starts_with($path, $root)) {
 			return null;
 		} else {
 			$path = substr($path, strlen($this->rootPath));
diff --git a/lib/private/Files/Storage/Wrapper/Quota.php b/lib/private/Files/Storage/Wrapper/Quota.php
index cfb2c455a2c..5786dba5114 100644
--- a/lib/private/Files/Storage/Wrapper/Quota.php
+++ b/lib/private/Files/Storage/Wrapper/Quota.php
@@ -109,7 +109,7 @@ class Quota extends Wrapper {
 		if (!$this->hasQuota()) {
 			return $this->storage->free_space($path);
 		}
-		if ($this->getQuota() < 0 || strpos($path, 'cache') === 0 || strpos($path, 'uploads') === 0) {
+		if ($this->getQuota() < 0 || str_starts_with($path, 'cache') || str_starts_with($path, 'uploads')) {
 			return $this->storage->free_space($path);
 		} else {
 			$used = $this->getSize($this->sizeRoot);
@@ -207,7 +207,7 @@ class Quota extends Wrapper {
 	 * Only apply quota for files, not metadata, trash or others
 	 */
 	private function shouldApplyQuota(string $path): bool {
-		return strpos(ltrim($path, '/'), 'files/') === 0;
+		return str_starts_with(ltrim($path, '/'), 'files/');
 	}
 
 	/**
diff --git a/lib/private/Files/Type/Detection.php b/lib/private/Files/Type/Detection.php
index 432bc4c4d6d..d3f548d6615 100644
--- a/lib/private/Files/Type/Detection.php
+++ b/lib/private/Files/Type/Detection.php
@@ -116,7 +116,7 @@ class Detection implements IMimeTypeDetector {
 
 		// Update the alternative mimetypes to avoid having to look them up each time.
 		foreach ($this->mimetypes as $extension => $mimeType) {
-			if (strpos($extension, '_comment') === 0) {
+			if (str_starts_with($extension, '_comment')) {
 				continue;
 			}
 			$this->secureMimeTypes[$mimeType[0]] = $mimeType[1] ?? $mimeType[0];
@@ -238,7 +238,7 @@ class Detection implements IMimeTypeDetector {
 			finfo_close($finfo);
 			if ($info) {
 				$info = strtolower($info);
-				$mimeType = strpos($info, ';') !== false ? substr($info, 0, strpos($info, ';')) : $info;
+				$mimeType = str_contains($info, ';') ? substr($info, 0, strpos($info, ';')) : $info;
 				$mimeType = $this->getSecureMimeType($mimeType);
 				if ($mimeType !== 'application/octet-stream') {
 					return $mimeType;
@@ -246,7 +246,7 @@ class Detection implements IMimeTypeDetector {
 			}
 		}
 
-		if (strpos($path, '://') !== false && strpos($path, 'file://') === 0) {
+		if (str_contains($path, '://') && str_starts_with($path, 'file://')) {
 			// Is the file wrapped in a stream?
 			return 'application/octet-stream';
 		}
@@ -308,7 +308,7 @@ class Detection implements IMimeTypeDetector {
 		if (function_exists('finfo_open') && function_exists('finfo_file')) {
 			$finfo = finfo_open(FILEINFO_MIME);
 			$info = finfo_buffer($finfo, $data);
-			return strpos($info, ';') !== false ? substr($info, 0, strpos($info, ';')) : $info;
+			return str_contains($info, ';') ? substr($info, 0, strpos($info, ';')) : $info;
 		}
 
 		$tmpFile = \OC::$server->getTempManager()->getTemporaryFile();
diff --git a/lib/private/Files/Utils/PathHelper.php b/lib/private/Files/Utils/PathHelper.php
index 07985e884ce..0fb7ba663cc 100644
--- a/lib/private/Files/Utils/PathHelper.php
+++ b/lib/private/Files/Utils/PathHelper.php
@@ -37,7 +37,7 @@ class PathHelper {
 		}
 		if ($path === $root) {
 			return '/';
-		} elseif (strpos($path, $root . '/') !== 0) {
+		} elseif (!str_starts_with($path, $root . '/')) {
 			return null;
 		} else {
 			$path = substr($path, strlen($root));
@@ -60,7 +60,7 @@ class PathHelper {
 			$path = '/' . $path;
 		}
 		//remove duplicate slashes
-		while (strpos($path, '//') !== false) {
+		while (str_contains($path, '//')) {
 			$path = str_replace('//', '/', $path);
 		}
 		//remove trailing slash
diff --git a/lib/private/Files/View.php b/lib/private/Files/View.php
index a73b60989fd..d256003537d 100644
--- a/lib/private/Files/View.php
+++ b/lib/private/Files/View.php
@@ -168,7 +168,7 @@ class View {
 		// missing slashes can cause wrong matches!
 		$root = rtrim($this->fakeRoot, '/') . '/';
 
-		if (strpos($path, $root) !== 0) {
+		if (!str_starts_with($path, $root)) {
 			return null;
 		} else {
 			$path = substr($path, strlen($this->fakeRoot));
@@ -2079,7 +2079,7 @@ class View {
 			return ($pathSegments[2] === 'files') && (count($pathSegments) > 3);
 		}
 
-		return strpos($path, '/appdata_') !== 0;
+		return !str_starts_with($path, '/appdata_');
 	}
 
 	/**
diff --git a/lib/private/IntegrityCheck/Checker.php b/lib/private/IntegrityCheck/Checker.php
index e31c5805541..a2ff62e4070 100644
--- a/lib/private/IntegrityCheck/Checker.php
+++ b/lib/private/IntegrityCheck/Checker.php
@@ -379,7 +379,7 @@ class Checker {
 		// integrity check.
 		if ($basePath === $this->environmentHelper->getServerRoot()) {
 			foreach ($expectedHashes as $fileName => $hash) {
-				if (strpos($fileName, 'updater/') === 0) {
+				if (str_starts_with($fileName, 'updater/')) {
 					unset($expectedHashes[$fileName]);
 				}
 			}
diff --git a/lib/private/L10N/Factory.php b/lib/private/L10N/Factory.php
index 1082662933f..778124c4c38 100644
--- a/lib/private/L10N/Factory.php
+++ b/lib/private/L10N/Factory.php
@@ -539,12 +539,12 @@ class Factory implements IFactory {
 	 */
 	private function isSubDirectory($sub, $parent) {
 		// Check whether $sub contains no ".."
-		if (strpos($sub, '..') !== false) {
+		if (str_contains($sub, '..')) {
 			return false;
 		}
 
 		// Check whether $sub is a subdirectory of $parent
-		if (strpos($sub, $parent) === 0) {
+		if (str_starts_with($sub, $parent)) {
 			return true;
 		}
 
diff --git a/lib/private/L10N/L10NString.php b/lib/private/L10N/L10NString.php
index 472a80a5b75..ea64f17eff3 100644
--- a/lib/private/L10N/L10NString.php
+++ b/lib/private/L10N/L10NString.php
@@ -65,12 +65,12 @@ class L10NString implements \JsonSerializable {
 
 		if (is_array($identity)) {
 			$pipeCheck = implode('', $identity);
-			if (strpos($pipeCheck, '|') !== false) {
+			if (str_contains($pipeCheck, '|')) {
 				return 'Can not use pipe character in translations';
 			}
 
 			$identity = implode('|', $identity);
-		} elseif (strpos($identity, '|') !== false) {
+		} elseif (str_contains($identity, '|')) {
 			return 'Can not use pipe character in translations';
 		}
 
diff --git a/lib/private/LargeFileHelper.php b/lib/private/LargeFileHelper.php
index c8d6ba42eb5..40cf2ecd5ff 100755
--- a/lib/private/LargeFileHelper.php
+++ b/lib/private/LargeFileHelper.php
@@ -150,9 +150,9 @@ class LargeFileHelper {
 			$os = strtolower(php_uname('s'));
 			$arg = escapeshellarg($filename);
 			$result = null;
-			if (strpos($os, 'linux') !== false) {
+			if (str_contains($os, 'linux')) {
 				$result = $this->exec("stat -c %s $arg");
-			} elseif (strpos($os, 'bsd') !== false || strpos($os, 'darwin') !== false) {
+			} elseif (str_contains($os, 'bsd') || str_contains($os, 'darwin')) {
 				$result = $this->exec("stat -f %z $arg");
 			}
 			return $result;
@@ -193,7 +193,7 @@ class LargeFileHelper {
 		if ($result < 0) {
 			if (\OCP\Util::isFunctionEnabled('exec')) {
 				$os = strtolower(php_uname('s'));
-				if (strpos($os, 'linux') !== false) {
+				if (str_contains($os, 'linux')) {
 					return (int)($this->exec('stat -c %Y ' . escapeshellarg($fullPath)) ?? -1);
 				}
 			}
diff --git a/lib/private/Log.php b/lib/private/Log.php
index c139510a3b3..99797b938db 100644
--- a/lib/private/Log.php
+++ b/lib/private/Log.php
@@ -242,8 +242,8 @@ class Log implements ILogger, IDataLogger {
 					$request = \OC::$server->getRequest();
 
 					if ($request->getMethod() === 'PUT' &&
-						strpos($request->getHeader('Content-Type'), 'application/x-www-form-urlencoded') === false &&
-						strpos($request->getHeader('Content-Type'), 'application/json') === false) {
+						!str_contains($request->getHeader('Content-Type'), 'application/x-www-form-urlencoded') &&
+						!str_contains($request->getHeader('Content-Type'), 'application/json')) {
 						$logSecretRequest = '';
 					} else {
 						$logSecretRequest = $request->getParam('log_secret', '');
@@ -391,7 +391,7 @@ class Log implements ILogger, IDataLogger {
 		foreach ($context as $key => $val) {
 			$fullKey = '{' . $key . '}';
 			$replace[$fullKey] = $val;
-			if (strpos($message, $fullKey) !== false) {
+			if (str_contains($message, $fullKey)) {
 				$usedContextKeys[$key] = true;
 			}
 		}
diff --git a/lib/private/Log/ExceptionSerializer.php b/lib/private/Log/ExceptionSerializer.php
index 78843de7206..b585461e8d9 100644
--- a/lib/private/Log/ExceptionSerializer.php
+++ b/lib/private/Log/ExceptionSerializer.php
@@ -205,7 +205,7 @@ class ExceptionSerializer {
 				return $this->editTrace($sensitiveValues, $traceLine);
 			}
 			foreach (self::methodsWithSensitiveParameters as $sensitiveMethod) {
-				if (strpos($traceLine['function'], $sensitiveMethod) !== false) {
+				if (str_contains($traceLine['function'], $sensitiveMethod)) {
 					return $this->editTrace($sensitiveValues, $traceLine);
 				}
 			}
diff --git a/lib/private/Memcache/ArrayCache.php b/lib/private/Memcache/ArrayCache.php
index 13597a068b3..8c0af399116 100644
--- a/lib/private/Memcache/ArrayCache.php
+++ b/lib/private/Memcache/ArrayCache.php
@@ -75,7 +75,7 @@ class ArrayCache extends Cache implements IMemcache {
 		}
 
 		foreach ($this->cachedData as $key => $value) {
-			if (strpos($key, $prefix) === 0) {
+			if (str_starts_with($key, $prefix)) {
 				$this->remove($key);
 			}
 		}
diff --git a/lib/private/Preview/Generator.php b/lib/private/Preview/Generator.php
index d19f5d29bf5..3ed263b7826 100644
--- a/lib/private/Preview/Generator.php
+++ b/lib/private/Preview/Generator.php
@@ -358,7 +358,7 @@ class Generator {
 		// It might have been generated with a higher resolution than the current value.
 		foreach ($previewFiles as $node) {
 			$name = $node->getName();
-			if (($prefix === '' || strpos($name, $prefix) === 0) && strpos($name, 'max')) {
+			if (($prefix === '' || str_starts_with($name, $prefix)) && strpos($name, 'max')) {
 				return $node;
 			}
 		}
diff --git a/lib/private/Profiler/FileProfilerStorage.php b/lib/private/Profiler/FileProfilerStorage.php
index b68038a65c4..d7f3df752a6 100644
--- a/lib/private/Profiler/FileProfilerStorage.php
+++ b/lib/private/Profiler/FileProfilerStorage.php
@@ -66,7 +66,7 @@ class FileProfilerStorage {
 			[$csvToken, $csvMethod, $csvUrl, $csvTime, $csvParent, $csvStatusCode] = $values;
 			$csvTime = (int) $csvTime;
 
-			if ($url && false === strpos($csvUrl, $url) || $method && false === strpos($csvMethod, $method) || $statusCode && false === strpos($csvStatusCode, $statusCode)) {
+			if ($url && !str_contains($csvUrl, $url) || $method && !str_contains($csvMethod, $method) || $statusCode && !str_contains($csvStatusCode, $statusCode)) {
 				continue;
 			}
 
diff --git a/lib/private/Route/Router.php b/lib/private/Route/Router.php
index e2a092d861e..fe97623176d 100644
--- a/lib/private/Route/Router.php
+++ b/lib/private/Route/Router.php
@@ -361,7 +361,7 @@ class Router implements IRouter {
 			$referenceType = UrlGenerator::ABSOLUTE_PATH;
 		}
 		$name = $this->fixLegacyRootName($name);
-		if (strpos($name, '.') !== false) {
+		if (str_contains($name, '.')) {
 			[$appName, $other] = explode('.', $name, 3);
 			// OCS routes are prefixed with "ocs."
 			if ($appName === 'ocs') {
diff --git a/lib/private/Security/Bruteforce/Throttler.php b/lib/private/Security/Bruteforce/Throttler.php
index d5fd0984baa..8c0f6f3d1a9 100644
--- a/lib/private/Security/Bruteforce/Throttler.php
+++ b/lib/private/Security/Bruteforce/Throttler.php
@@ -157,7 +157,7 @@ class Throttler implements IThrottler {
 
 		$keys = $this->config->getAppKeys('bruteForce');
 		$keys = array_filter($keys, function ($key) {
-			return 0 === strpos($key, 'whitelist_');
+			return str_starts_with($key, 'whitelist_');
 		});
 
 		if (filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4)) {
diff --git a/lib/private/Security/RemoteHostValidator.php b/lib/private/Security/RemoteHostValidator.php
index e48bd862472..38129fbd81b 100644
--- a/lib/private/Security/RemoteHostValidator.php
+++ b/lib/private/Security/RemoteHostValidator.php
@@ -30,7 +30,6 @@ use OC\Net\IpAddressClassifier;
 use OCP\IConfig;
 use OCP\Security\IRemoteHostValidator;
 use Psr\Log\LoggerInterface;
-use function strpos;
 use function strtolower;
 use function substr;
 use function urldecode;
@@ -61,7 +60,7 @@ final class RemoteHostValidator implements IRemoteHostValidator {
 
 		$host = idn_to_utf8(strtolower(urldecode($host)));
 		// Remove brackets from IPv6 addresses
-		if (strpos($host, '[') === 0 && substr($host, -1) === ']') {
+		if (str_starts_with($host, '[') && str_ends_with($host, ']')) {
 			$host = substr($host, 1, -1);
 		}
 
diff --git a/lib/private/Security/TrustedDomainHelper.php b/lib/private/Security/TrustedDomainHelper.php
index 1927af9cb1d..ca6a5cba073 100644
--- a/lib/private/Security/TrustedDomainHelper.php
+++ b/lib/private/Security/TrustedDomainHelper.php
@@ -98,7 +98,7 @@ class TrustedDomainHelper implements ITrustedDomainHelper {
 			return true;
 		}
 		// Reject malformed domains in any case
-		if (strpos($domain, '-') === 0 || strpos($domain, '..') !== false) {
+		if (str_starts_with($domain, '-') || str_contains($domain, '..')) {
 			return false;
 		}
 		// Match, allowing for * wildcards
diff --git a/lib/private/ServerContainer.php b/lib/private/ServerContainer.php
index e53737990e8..a8583bd6875 100644
--- a/lib/private/ServerContainer.php
+++ b/lib/private/ServerContainer.php
@@ -157,7 +157,7 @@ class ServerContainer extends SimpleContainer {
 				// Didn't find the service or the respective app container,
 				// ignore it and fall back to the core container.
 			}
-		} elseif (strpos($name, 'OC\\Settings\\') === 0 && substr_count($name, '\\') >= 3) {
+		} elseif (str_starts_with($name, 'OC\\Settings\\') && substr_count($name, '\\') >= 3) {
 			$segments = explode('\\', $name);
 			try {
 				$appContainer = $this->getAppContainer(strtolower($segments[1]), $segments[1]);
@@ -177,7 +177,7 @@ class ServerContainer extends SimpleContainer {
 	 * @return DIContainer|null
 	 */
 	public function getAppContainerForService(string $id): ?DIContainer {
-		if (strpos($id, 'OCA\\') !== 0 || substr_count($id, '\\') < 2) {
+		if (!str_starts_with($id, 'OCA\\') || substr_count($id, '\\') < 2) {
 			return null;
 		}
 
diff --git a/lib/private/Share/Share.php b/lib/private/Share/Share.php
index dec71f792fd..8d14f293e5a 100644
--- a/lib/private/Share/Share.php
+++ b/lib/private/Share/Share.php
@@ -942,9 +942,9 @@ class Share extends Constants {
 	 * @return string
 	 */
 	public static function removeProtocolFromUrl($url) {
-		if (strpos($url, 'https://') === 0) {
+		if (str_starts_with($url, 'https://')) {
 			return substr($url, strlen('https://'));
-		} elseif (strpos($url, 'http://') === 0) {
+		} elseif (str_starts_with($url, 'http://')) {
 			return substr($url, strlen('http://'));
 		}
 
diff --git a/lib/private/Share20/DefaultShareProvider.php b/lib/private/Share20/DefaultShareProvider.php
index 9dd862abb31..5201cf074b1 100644
--- a/lib/private/Share20/DefaultShareProvider.php
+++ b/lib/private/Share20/DefaultShareProvider.php
@@ -884,7 +884,7 @@ class DefaultShareProvider implements IShareProvider {
 		$pathSections = explode('/', $data['path'], 2);
 		// FIXME: would not detect rare md5'd home storage case properly
 		if ($pathSections[0] !== 'files'
-			&& (strpos($data['storage_string_id'], 'home::') === 0 || strpos($data['storage_string_id'], 'object::user') === 0)) {
+			&& (str_starts_with($data['storage_string_id'], 'home::') || str_starts_with($data['storage_string_id'], 'object::user'))) {
 			return false;
 		} elseif ($pathSections[0] === '__groupfolders'
 			&& str_starts_with($pathSections[1], 'trash/')
diff --git a/lib/private/Template/JSResourceLocator.php b/lib/private/Template/JSResourceLocator.php
index 61611c69b0f..ab5de182d89 100644
--- a/lib/private/Template/JSResourceLocator.php
+++ b/lib/private/Template/JSResourceLocator.php
@@ -52,7 +52,7 @@ class JSResourceLocator extends ResourceLocator {
 		$app = substr($script, 0, strpos($script, '/'));
 		$scriptName = basename($script);
 
-		if (strpos($script, '/l10n/') !== false) {
+		if (str_contains($script, '/l10n/')) {
 			// For language files we try to load them all, so themes can overwrite
 			// single l10n strings without having to translate all of them.
 			$found = 0;
@@ -113,7 +113,7 @@ class JSResourceLocator extends ResourceLocator {
 		}
 
 		// missing translations files will be ignored
-		if (strpos($script, 'l10n/') === 0) {
+		if (str_starts_with($script, 'l10n/')) {
 			return;
 		}
 
diff --git a/lib/private/TemplateLayout.php b/lib/private/TemplateLayout.php
index 52c60e58991..b99c62731fe 100644
--- a/lib/private/TemplateLayout.php
+++ b/lib/private/TemplateLayout.php
@@ -284,7 +284,7 @@ class TemplateLayout extends \OC_Template {
 			} else {
 				$suffix = $this->getVersionHashSuffix($web, $file);
 
-				if (strpos($file, '?v=') == false) {
+				if (!strpos($file, '?v=')) {
 					$this->append('cssfiles', $web.'/'.$file . $suffix);
 				} else {
 					$this->append('cssfiles', $web.'/'.$file . '-' . substr($suffix, 3));
diff --git a/lib/private/URLGenerator.php b/lib/private/URLGenerator.php
index 2410b8a9147..3a52b99889c 100644
--- a/lib/private/URLGenerator.php
+++ b/lib/private/URLGenerator.php
@@ -272,13 +272,13 @@ class URLGenerator implements IURLGenerator {
 	 * @return string the absolute version of the url
 	 */
 	public function getAbsoluteURL(string $url): string {
-		$separator = strpos($url, '/') === 0 ? '' : '/';
+		$separator = str_starts_with($url, '/') ? '' : '/';
 
 		if (\OC::$CLI && !\defined('PHPUNIT_RUN')) {
 			return rtrim($this->config->getSystemValueString('overwrite.cli.url'), '/') . '/' . ltrim($url, '/');
 		}
 		// The ownCloud web root can already be prepended.
-		if (\OC::$WEBROOT !== '' && strpos($url, \OC::$WEBROOT) === 0) {
+		if (\OC::$WEBROOT !== '' && str_starts_with($url, \OC::$WEBROOT)) {
 			$url = substr($url, \strlen(\OC::$WEBROOT));
 		}
 
@@ -302,7 +302,7 @@ class URLGenerator implements IURLGenerator {
 	public function linkToDefaultPageUrl(): string {
 		// Deny the redirect if the URL contains a @
 		// This prevents unvalidated redirects like ?redirect_url=:user@domain.com
-		if (isset($_REQUEST['redirect_url']) && strpos($_REQUEST['redirect_url'], '@') === false) {
+		if (isset($_REQUEST['redirect_url']) && !str_contains($_REQUEST['redirect_url'], '@')) {
 			return $this->getAbsoluteURL(urldecode($_REQUEST['redirect_url']));
 		}
 
diff --git a/lib/private/User/Session.php b/lib/private/User/Session.php
index 6273945ec43..840a3c04373 100644
--- a/lib/private/User/Session.php
+++ b/lib/private/User/Session.php
@@ -818,7 +818,7 @@ class Session implements IUserSession, Emitter {
 	 */
 	public function tryTokenLogin(IRequest $request) {
 		$authHeader = $request->getHeader('Authorization');
-		if (strpos($authHeader, 'Bearer ') === 0) {
+		if (str_starts_with($authHeader, 'Bearer ')) {
 			$token = substr($authHeader, 7);
 		} else {
 			// No auth header, let's try session id
diff --git a/lib/private/User/User.php b/lib/private/User/User.php
index c68d4ee290a..bdc9a4d6fb7 100644
--- a/lib/private/User/User.php
+++ b/lib/private/User/User.php
@@ -596,7 +596,7 @@ class User implements IUser {
 	}
 
 	private function removeProtocolFromUrl(string $url): string {
-		if (strpos($url, 'https://') === 0) {
+		if (str_starts_with($url, 'https://')) {
 			return substr($url, strlen('https://'));
 		}
 
diff --git a/lib/private/legacy/OC_App.php b/lib/private/legacy/OC_App.php
index b1da6a1d2fb..d790c1c2261 100644
--- a/lib/private/legacy/OC_App.php
+++ b/lib/private/legacy/OC_App.php
@@ -979,7 +979,7 @@ class OC_App {
 
 				if ($attributeLang === $similarLang) {
 					$similarLangFallback = $option['@value'];
-				} elseif (strpos($attributeLang, $similarLang . '_') === 0) {
+				} elseif (str_starts_with($attributeLang, $similarLang . '_')) {
 					if ($similarLangFallback === false) {
 						$similarLangFallback = $option['@value'];
 					}
diff --git a/lib/private/legacy/OC_Files.php b/lib/private/legacy/OC_Files.php
index 5655139b24a..b6c45e164ef 100644
--- a/lib/private/legacy/OC_Files.php
+++ b/lib/private/legacy/OC_Files.php
@@ -179,7 +179,7 @@ class OC_Files {
 
 			$streamer->sendHeaders($name);
 			$executionTime = (int)OC::$server->get(IniGetWrapper::class)->getNumeric('max_execution_time');
-			if (strpos(@ini_get('disable_functions'), 'set_time_limit') === false) {
+			if (!str_contains(@ini_get('disable_functions'), 'set_time_limit')) {
 				@set_time_limit(0);
 			}
 			ignore_user_abort(true);
diff --git a/lib/private/legacy/OC_Util.php b/lib/private/legacy/OC_Util.php
index a04d154ef8b..63599ff833b 100644
--- a/lib/private/legacy/OC_Util.php
+++ b/lib/private/legacy/OC_Util.php
@@ -987,7 +987,7 @@ class OC_Util {
 			$content = false;
 		}
 
-		if (strpos($url, 'https:') === 0) {
+		if (str_starts_with($url, 'https:')) {
 			$url = 'http:' . substr($url, 6);
 		} else {
 			$url = 'https:' . substr($url, 5);
@@ -1160,7 +1160,7 @@ class OC_Util {
 		}
 
 		foreach (str_split($trimmed) as $char) {
-			if (strpos(\OCP\Constants::FILENAME_INVALID_CHARS, $char) !== false) {
+			if (str_contains(\OCP\Constants::FILENAME_INVALID_CHARS, $char)) {
 				return false;
 			}
 		}