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system/Autoloader/Autoloader.php

system/BaseModel.php

system/Cache/Handlers/BaseHandler.php

system/Cache/Handlers/FileHandler.php

system/CLI/BaseCommand.php

system/CLI/CLI.php

system/CLI/GeneratorTrait.php

system/CodeIgniter.php

system/Config/BaseService.php

system/Config/Services.php

system/Database/BaseBuilder.php

system/Database/BaseConnection.php

system/Database/Forge.php

system/Database/OCI8/Forge.php

system/Database/Seeder.php

system/Database/SQLSRV/Connection.php

system/Database/SQLSRV/Forge.php

system/Debug/Exceptions.php

system/Debug/Toolbar/Collectors/BaseCollector.php

system/Entity/Entity.php

system/Exceptions/DownloadException.php

system/Exceptions/FrameworkException.php

system/Files/File.php

system/Filters/Filters.php

system/Helpers/text_helper.php

system/Honeypot/Exceptions/HoneypotException.php

system/HTTP/Exceptions/HTTPException.php

system/HTTP/IncomingRequest.php

system/HTTP/Message.php

system/HTTP/OutgoingRequest.php

system/HTTP/Request.php

system/HTTP/RequestTrait.php

system/HTTP/Response.php

system/HTTP/SiteURI.php

system/HTTP/URI.php

system/I18n/TimeLegacy.php

system/I18n/TimeTrait.php

system/Router/AutoRouter.php

system/Router/RouteCollection.php

system/Router/Router.php

system/Security/Exceptions/SecurityException.php

system/Security/Security.php

system/Security/SecurityInterface.php

system/Session/Exceptions/SessionException.php

system/Session/Session.php

system/Test/Mock/MockCodeIgniter.php

Autoloader.php

Line	Element	Reason
336	Autoloader::sanitizeFilename()	No longer used. See https://github.com/codeigniter4/CodeIgniter4/issues/7055
452	Autoloader::discoverComposerNamespaces()	No longer used.

BaseModel.php

Line	Element	Reason
1684	BaseModel::transformDataRowToArray()	Since 4.6.4, temporary solution - will be removed in 4.7

BaseHandler.php

Line	Element	Reason
36	BaseHandler::RESERVED_CHARACTERS	in favor of the Cache config

FileHandler.php

Line	Element	Reason
279	FileHandler::writeFile()	Use `write_file()` instead.
314	FileHandler::deleteFiles()	Use `delete_files()` instead.
358	FileHandler::getDirFileInfo()	Use `get_dir_file_info()` instead.
417	FileHandler::getFileInfo()	Use `get_file_info()` instead.

BaseCommand.php

Line	Element	Reason
205	BaseCommand::getPad()	Use setPad() instead.

CLI.php

Line	Element	Reason
535	CLI::isWindows()	Use `is_windows()` instead
43	CLI::$readline_support	Should be protected, and no longer used.
53	CLI::$wait_msg	Should be protected.

GeneratorTrait.php

Line	Element	Reason
110	GeneratorTrait::execute()	use generateClass() instead

CodeIgniter.php

Line	Element	Reason
206	CodeIgniter::resolvePlatformExtensions()	Moved to system/bootstrap.php.
234	CodeIgniter::initializeKint()	Moved to Autoloader.
251	CodeIgniter::autoloadKint()	Moved to Autoloader.
276	CodeIgniter::configureKint()	Moved to Autoloader.
449	CodeIgniter::handleRequest()	$returnResponse is deprecated.
565	CodeIgniter::detectEnvironment()	No longer used. Moved to index.php and spark.
583	CodeIgniter::bootstrapEnvironment()	Moved to system/bootstrap.php.
690	CodeIgniter::forceSecureAccess()	No longer used. Moved to ForceHTTPS filter.
709	CodeIgniter::displayCache()	PageCache required filter is used. No longer used.
709	CodeIgniter::displayCache()	The parameter $config is deprecated. No longer used.
732	CodeIgniter::cache()	Moved to ResponseCache::setTtl(). No longer used.
745	CodeIgniter::cachePage()	No longer used.
775	CodeIgniter::generateCacheName()	No longer used.
795	CodeIgniter::displayPerformanceMetrics()	PerformanceMetrics required filter is used. No longer used.
854	CodeIgniter::determinePath()	No longer used.
999	CodeIgniter::gatherOutput()	$cacheConfig is deprecated.
1123	CodeIgniter::callExit()	No longer Used. Moved to index.php.
137	CodeIgniter::$cacheTTL	Moved to ResponseCache::$ttl. No longer used.
158	CodeIgniter::$returnResponse	No longer used.

BaseService.php

Line	Element	Reason
184	BaseService::$services	No longer used.

Services.php

Line	Element	Reason
521	Services::request()	The parameter $config and $getShared are deprecated.

BaseBuilder.php

Line	Element	Reason
2272	BaseBuilder::setInsertBatch()
2723	BaseBuilder::setUpdateBatch()
3560	BaseBuilder::cleanClone()

BaseConnection.php

Line	Element	Reason
189	BaseConnection::$strictOn	Will move to MySQLi\Connection.

Forge.php

Line	Element	Reason
595	Forge::_createTable()	$ifNotExists is no longer used, and will be removed.
118	Forge::$createTableIfStr	This is no longer used.

Forge.php

Line	Element	Reason
44	Forge::$createTableIfStr	This is no longer used.

Seeder.php

Line	Element	Reason
74	Seeder::$faker

Connection.php

Line	Element	Reason
549	Connection::getError()	Use `error()` instead.

Forge.php

Line	Element	Reason
104	Forge::$createTableIfStr	This is no longer used.

Exceptions.php

Line	Element	Reason
329	Exceptions::determineView()	No longer used. Moved to ExceptionHandler.
365	Exceptions::render()	No longer used. Moved to BaseExceptionHandler.
407	Exceptions::collectVars()	No longer used. Moved to BaseExceptionHandler.
442	Exceptions::maskSensitiveData()	No longer used. Moved to BaseExceptionHandler.
458	Exceptions::maskData()	No longer used. Moved to BaseExceptionHandler.
546	Exceptions::cleanPath()	Use dedicated `clean_path()` function.
563	Exceptions::describeMemory()	No longer used. Moved to BaseExceptionHandler.
583	Exceptions::highlightFile()	No longer used. Moved to BaseExceptionHandler.
45	Exceptions::$ob_level	No longer used. Moved to BaseExceptionHandler.
55	Exceptions::$viewPath	No longer used. Moved to BaseExceptionHandler.

BaseCollector.php

Line	Element	Reason
183	BaseCollector::cleanPath()	Use the dedicated `clean_path()` function.

Entity.php

Line	Element	Reason
323	Entity::setAttributes()	Use injectRawData() instead.

DownloadException.php

Line	Element	Reason
52	DownloadException::forCannotSetCache()	Since v4.5.6

FrameworkException.php

Line	Element	Reason
63	FrameworkException::forMissingExtension()	No longer used.

File.php

Line	Element	Reason
100	File::getSizeByUnit()	Use getSizeByBinaryUnit() or getSizeByMetricUnit() instead

Filters.php

Line	Element	Reason
173	Filters::discoverFilters()	Use Registrar instead.
654	Filters::getArguments()	Already does not work.
134	Filters::$arguments	No longer used.
143	Filters::$argumentsClass	No longer used.

text_helper.php

Line	Element	Reason
553	random_string()	The type 'basic', 'md5', and 'sha1' are deprecated. They are not cryptographically secure.

HoneypotException.php

Line	Element	Reason
47	HoneypotException::forNoHiddenValue()	Never used.

HTTPException.php

Line	Element	Reason
229	HTTPException::forInvalidSameSiteSetting()	Use `CookieException::forInvalidSameSite()` instead.

IncomingRequest.php

Line	Element	Reason
212	IncomingRequest::detectURI()	No longer used.
223	IncomingRequest::detectPath()	Moved to SiteURIFactory.
246	IncomingRequest::parseRequestURI()	Moved to SiteURIFactory.
306	IncomingRequest::parseQueryString()	Moved to SiteURIFactory.
421	IncomingRequest::setPath()	This method will be private. The parameter $config is deprecated. No longer used.

Message.php

Line	Element	Reason
74	Message::getHeaders()	Use Message::headers() to make room for PSR-7
91	Message::getHeader()	Use Message::header() to make room for PSR-7

OutgoingRequest.php

Line	Element	Reason
87	OutgoingRequest::setMethod()	Use withMethod() instead for immutability

Request.php

Line	Element	Reason
54	Request::setMethod()	Use withMethod() instead for immutability

RequestTrait.php

Line	Element	Reason
218	RequestTrait::getEnv()	This method does not work from the beginning. Use `env()`.
44	RequestTrait::$ipAddress	Will become private in a future release

Response.php

Line	Element	Reason
153	Response::__construct()	The param $config is no longer used.

SiteURI.php

Line	Element	Reason
225	SiteURI::setBaseURL()
233	SiteURI::setURI()
317	SiteURI::refreshPath()	This method will be private.
75	SiteURI::$segments	This property will be private.

URI.php

Line	Element	Reason
275	URI::setSilent()	Method not in PSR-7
306	URI::setURI()	This method will be private.
661	URI::changeSchemeAndPath()	This method will be deleted.
725	URI::setScheme()	Use `withScheme()` instead.
844	URI::setBaseURL()	Use SiteURI instead.
856	URI::getBaseURL()	Use SiteURI instead.
872	URI::refreshPath()	This method will be private.
46	URI::$uriString	Not used.
53	URI::$baseURL	Use SiteURI instead.

TimeLegacy.php

Line	Element	Reason
49	TimeLegacy	Use Time instead.

TimeTrait.php

Line	Element	Reason
301	TimeTrait::instance()	Use createFromInstance() instead

AutoRouter.php

Line	Element	Reason
171	AutoRouter::setTranslateURIDashes()	This method should be removed.
245	AutoRouter::setDirectory()	This method should be removed.

RouteCollection.php

Line	Element	Reason
1260	RouteCollection::localizeRoute()	Unused.
1314	RouteCollection::fillRouteParams()	Unused. Now uses buildReverseRoute().

Router.php

Line	Element	Reason
362	Router::setTranslateURIDashes()	This method should be removed.
581	Router::validateRequest()	this function name does not properly describe its behavior so it has been deprecated
595	Router::scanControllers()	Not used. Moved to AutoRouter class.
643	Router::setDirectory()	This method should be removed.
661	Router::isValidSegment()	Moved to AutoRouter class.
705	Router::setDefaultController()	This was an unnecessary method, so it is no longer used.

SecurityException.php

Line	Element	Reason
80	SecurityException::forInvalidSameSite()	Use `CookieException::forInvalidSameSite()` instead.

Security.php

Line	Element	Reason
435	Security::sanitizeFilename()	Use `sanitize_filename()` instead
53	Security::$csrfProtection	Use $this->config->csrfProtection.
62	Security::$tokenRandomize	Use $this->config->tokenRandomize.
82	Security::$tokenName	Use $this->config->tokenName.
93	Security::$headerName	Use $this->config->headerName.
122	Security::$expires	Use $this->config->expires.
133	Security::$regenerate	Use $this->config->regenerate.
144	Security::$redirect	Use $this->config->redirect.
161	Security::$samesite	`Config\Cookie` $samesite property is used.

SecurityInterface.php

Line	Element	Reason
74	SecurityInterface::sanitizeFilename()	Use `sanitize_filename()` instead

SessionException.php

Line	Element	Reason
67	SessionException::forInvalidSameSiteSetting()

Session.php

Line	Element	Reason
274	Session::stop()	Use destroy() instead.
50	Session::$sessionDriverName	Use $this->config->driver.
59	Session::$sessionCookieName	Use $this->config->cookieName.
69	Session::$sessionExpiration	Use $this->config->expiration.
87	Session::$sessionSavePath	Use $this->config->savePath.
99	Session::$sessionMatchIP	Use $this->config->matchIP.
108	Session::$sessionTimeToUpdate	Use $this->config->timeToUpdate.
119	Session::$sessionRegenerateDestroy	Use $this->config->regenerateDestroy.
136	Session::$cookieDomain	No longer used.
146	Session::$cookiePath	No longer used.
155	Session::$cookieSecure	No longer used.
165	Session::$cookieSameSite	No longer used.

MockCodeIgniter.php

Line	Element	Reason
27	MockCodeIgniter::callExit()	No longer Used. Moved to index.php.