Release notes/1.34

= MediaWiki 1.34 =

THIS IS NOT A RELEASE YET

MediaWiki 1.34 is an pre-release testing branch, and is not recommended for use in production.

Changes since MediaWiki 1.34.0-rc.0

 * (T231742) rdbms: Restore debug toolbar "Queries" feature.

Upgrading notes for 1.34
1.34 has several database changes since 1.33, and will not work without schema updates. Note that due to changes to some very large tables like the revision table, the schema update may take quite long (minutes on a medium sized site, many hours on a large site).

Don't forget to always back up your database before upgrading!

See the file UPGRADE for more detailed upgrade instructions, including important information when upgrading from versions prior to 1.11.

Some specific notes for MediaWiki 1.34 upgrades are below:


 * MediaWiki now requires PHP 7.2.9 or above.
 * MediaWiki no longer supports HHVM.

For notes on 1.33.x and older releases, see HISTORY.

Configuration changes for system administrators in 1.34
In an effort to enforce best practices for passwords, MediaWiki will now warn users, and suggest that they change their password, if it is in the list of 100,000 commonly used passwords that are considered bad passwords. If you want to disable this for your users, please add the following to your local settings:

$wgPasswordPolicy['policies']['default']['PasswordNotInLargeBlacklist'] = false;

New configuration
Mediawiki accepts the request ID set by the incoming request via the `X-Request-Id` header. If set to `true`, that value will be used throughout the code as the request identificator. Otherwise, the sent header will be ignored and the request ID will either be taken from Apache's mod_unique module or will be generated by Mediawiki itself (depending on the set-up). Special:Mute is available and whether to include a link to it on emails originating from Special:Email. redirects in their userspace unless the target of the redirect is also in their userspace. By default, this right is given to everyone.
 * $wgAllowExternalReqID (T201409) - This configuration setting controls whether
 * $wgEnableSpecialMute (T218265) - This configuration controls whether
 * editmyuserjsredirect user right – users without this right now cannot edit JS
 * (T226733) Add rate limiter to Special:ConfirmEmail.

Changed configuration
CDN-related config variables have been renamed from being specific to Squid – they were previously $wgUseSquid, $wgSquidServers, $wgSquidServersNoPurge, and $wgSquidMaxage respectively. This aligns them with the related existing variable $wgCdnMaxageLagged. The previous configuration variable names are deprecated, but will be used as the fall back if they are still set. Note that wgSquidPurgeUseHostHeader has not been renamed, as it is deprecated. containing some HTML markup in metadata. As a result, the $wgAllowTitlesInSVG setting is no longer applied and is now always true. Note that MSIE 7 may still be able to misinterpret certain malformed PNG files as HTML. detection heuristic on upload, which is more conservative than the checks that were changed above. 'wikidiff2', or 'wikidiff3' will no longer work. This legacy behaviour was deprecated in MediaWiki 1.27, 1.32, and 1.27, respectively. hard-deprecated. 1.23, is now hard-deprecated. Instead, set the log file in $wgDebugLogGroups['profileoutput']. which was deprecated in 1.30, no longer works. Instead, $wgProxyList should be an array with IP addresses as the values, or a string path to a file containing one IP address per line.
 * $wgUseCdn, $wgCdnServers, $wgCdnServersNoPurge, and $wgCdnMaxAge – These four
 * (T27707) File type checks for image uploads have been relaxed to allow files
 * Introduced $wgVerifyMimeTypeIE to allow disabling the MSIE 6/7 file type
 * $wgExternalDiffEngine — Setting this to a string value of 'wikidiff',
 * $wgSkipSkin — Setting this instead of $wgSkipSkins, deprecated in 1.23, is now
 * $wgLocalInterwiki — Setting this instead of $wgLocalInterwikis, deprecated in
 * $wgProfileOnly — Setting this, deprecated in 1.23, is now hard-deprecated.
 * $wgProxyList — Setting this to an array with IP addresses in the array keys,
 * $wgCookieSetOnAutoblock and $wgCookieSetOnIpBlock are now enabled by default.

Removed configuration
size threshold, please specify in php.ini, using the configuration variable wikidiff2.moved_paragraph_detection_cutoff. debug log channel is no longer configurable. The debug log itself remains configurable via $wgDebugLogFile. stored in WANObjectCache. This is no longer configurable. password setups and deprecated since 1.24, is now removed. in the 'flags' field for servers in $wgDBServers (or $wgLBFactoryConf). MediaWiki 1.31+ finding it unset should treat it as being SCHEMA_COMPAT_NEW.
 * $wgWikiDiff2MovedParagraphDetectionCutoff — If you still want a custom change
 * $wgUseESI - This experimental setting, deprecated in 1.33, is now removed.
 * $wgDebugPrintHttpHeaders - The default of including HTTP headers in the
 * $wgMsgCacheExpiry - The MessageCache uses 24 hours as the expiry for values
 * $wgPasswordSalt – This setting, used for migrating exceptionally old, insecure
 * $wgDBOracleDRCP - If you must use persistent connections, set DBO_PERSISTENT
 * $wgMemCachedDebug - Set the cache "debug" field in $wgObjectCaches instead.
 * $wgActorTableSchemaMigrationStage has been removed. Extension code for

New user-facing features in 1.34
from other users originating from Special:EmailUser. section on a page. When linked to, its subpage is used as the target (Special:NewSection/Test redirects to creating a new section in "Test"). Otherwise, it displays a basic interface to allow the end user to specify the target manually. usefulness reasons. Use Special:RecentChanges?userExpLevel=newcomer instead. reasons. Use Special:RecentChanges?userExpLevel=newcomer&namespace=6 instead.
 * Special:Mute has been added as a quick way for users to block unwanted emails
 * (T207577) Special:NewSection has been created as a shortcut to creating a new
 * (T220447) Special:Contributions/newbies has been removed for performance and
 * Special:NewFiles/newbies has been removed for performance and usefulness

New developer features in 1.34
of headers in private wikis. strings like "5 days ago" instead of "5 days 13 hours ago". to add fields to Special:Mute. See  for details. GetBlockedStatus. specs can now specify needed DI services. allowing the construction of special pages that require services to be injected in their constructor. allowing the construction of modules that require services to be injected in their constructor. has changed. It now expects definitions of additional filter fields as array rather than string.
 * The ImgAuthModifyHeaders hook was added to img_auth.php to allow modification
 * Language::formatTimePeriod now supports the new 'avoidhours' option to output
 * (T220163) Added SpecialMuteModifyFormFields hook to allow extensions
 * (T100896) Skin authors can define custom OOUI themes using OOUIThemePaths.
 * (T229035) The GetUserBlock hook was added. Use this instead of
 * ObjectFactory is available as a service. When used as a service, the object
 * (T222388) Special pages can now be specified as an ObjectFactory spec,
 * (T222388) API modules can now be specified as an ObjectFactory spec,
 * (T117736) The function signature of SpecialContributions::getForm::filters

Changed external libraries

 * Updated Mustache from 1.0.0 to v3.0.1.
 * Updated OOUI from v0.31.3 to v0.34.0.
 * Updated OOjs from v2.2.2 to v3.0.0.
 * Updated composer/semver from 1.4.2 to 1.5.0.
 * Updated composer/spdx-licenses from 1.4.0 to 1.5.1 (dev-only).
 * Updated mediawiki/codesniffer from 25.0.0 to 26.0.0 (dev-only).
 * Updated cssjanus/cssjanus from 1.2.1 to 1.3.0.
 * Updated wikimedia/at-ease from 1.2.0 to 2.0.0.
 * Updated wikimedia/remex-html from 2.0.1 to 2.1.0.
 * Updated monolog/monolog from 1.22.1 to 1.24.0 (dev-only).
 * Updated wikimedia/object-factory from 1.0.0 to 2.1.0.
 * Updated wikimedia/timestamp from 2.2.0 to 3.0.0.
 * Updated wikimedia/xmp-reader from 0.6.2 to 0.6.3.
 * Updated mediawiki/mediawiki-phan-config from 0.6.0 to 0.6.1 (dev-only).
 * Updated wikimedia/avro from 1.8.0 to 1.9.0 (dev-only).

Removed external libraries

 * The jquery.async module, deprecated in 1.33, was removed.

Bug fixes in 1.34
empty username, attempting to display it will log an error and return a "no username available" to the user instead of silently displaying nothing or  invalid links.
 * (T222529) If a log entry or page revision is recorded in the database with an

Action API changes in 1.34
deprecated in 1.25, has been removed. prop=deletedrevisions no longer require the 'deletedhistory' user right. non-existing files (indicated by the 'filemissing' field) now omit the following fields, since they are meaningless in this context: 'timestamp', 'userhidden', 'user', 'userid', 'anon', 'size', 'width', 'height', 'pagecount', 'duration', 'commenthidden', 'parsedcomment', 'comment', 'thumburl', 'thumbwidth', 'thumbheight', 'thumbmime', 'thumberror', 'url', 'sha1', 'metadata', 'extmetadata', 'commonmetadata', 'mime', 'mediadtype', 'bitdepth'. Clients that process these fields should first check if 'filemissing' is set. Fields that are supported even if the file is missing include: 'canonicaltitle', ''archivename' (deleted files only), 'descriptionurl', 'descriptionshorturl'. returned in the same format used by the rest of the API: ISO 8601 for expiring blocks, and "infinite" for non-expiring blocks.
 * The 'recenteditcount' response property from action=query list=allusers,
 * (T60993) action=query list=filearchive, list=alldeletedrevisions and
 * In the response to queries that use 'prop=imageinfo', entries for
 * The 'blockexpiry' result property in list=users and list=allusers will now be

Action API internal changes in 1.34
from an MWException to an UnexpectedValueException, thrown by ObjectFactory. ApiModuleManager::getModule now also throws InvalidArgumentExceptions when ObjectFactory is presented with an invalid spec or incorrectly constructed objects.
 * The exception thrown in ApiModuleManager::getModule has been changed
 * Added ApiQueryBlockInfoTrait.

Languages updated in 1.34
MediaWiki supports over 350 languages. Many localisations are updated regularly. Below only new and removed languages are listed, as well as changes to languages because of Phabricator reports.


 * (T152908) Added language support for N'Ko (nqo).

Breaking changes in 1.34
1.26, have been removed. Use Wikimedia\AtEase\AtEase::suppressWarnings and Wikimedia\AtEase\AtEase::restoreWarnings directly. built-in PHP functions: * CryptRand class * CryptRand service * Functions of the MWCryptRand class: singleton, wasStrong and generate. * SpecialAncientpages => SpecialAncientPages * SpecialConfirmemail => SpecialConfirmEmail * SpecialDeadendpages => SpecialDeadendPages * SpecialFewestrevisions => SpecialFewestRevisions * SpecialListredirects => SpecialListRedirects * SpecialLonelypages => SpecialLonelyPages * SpecialLongpages => SpecialLongPages * SpecialMIMEsearch => SpecialMIMESearch * SpecialMostcategories => SpecialMostCategories * SpecialMostinterwikis => SpecialMostInterwikis * SpecialMostlinked => SpecialMostLinked * SpecialMostlinkedcategories => SpecialMostLinkedCategories * SpecialMostlinkedtemplates => SpecialMostLinkedTemplates * SpecialMostrevisions => SpecialMostRevisions * SpecialNewimages => SpecialNewFiles * SpecialShortpages => SpecialShortPages * SpecialUncategorizedcategories => SpecialUncategorizedCategories * SpecialUncategorizedimages => SpecialUncategorizedImages * SpecialUncategorizedpages => SpecialUncategorizedPages * SpecialUncategorizedtemplates => SpecialUncategorizedTemplates * SpecialUnusedcategories => SpecialUnusedCategories * SpecialUnusedimages => SpecialUnusedImages * SpecialUnusedtemplates => SpecialUnusedTemplates * SpecialUnwatchedpages => SpecialUnwatchedPages * SpecialWantedcategories => SpecialWantedCategories * SpecialWantedtemplates => SpecialWantedTemplates * SpecialWithoutinterwiki => SpecialWithoutInterwiki create a new Language object with a different language code. to MWNamespace::getCanonicalNamespaces, which was deprecated since 1.31. Instead, reset services, such as by calling $this->overrideMwServices (if your test extends MediaWikiTestCase). Services will generally not pick up configuration changes from after they were created, so you must reset services after any configuration change. Even if your code works now, it is likely to break in future versions as more code is moved to services. been removed. This behavior was removed, and the method now matches the parent signature (SpecialPage::execute) which is to return HTML string or void. To obtain the destination title, use RedirectSpecialPage::getRedirect. list=allusers, deprecated in 1.25, has been removed. SearchEngine::create, SearchEngine::getSearchTypes and SearchEngine::getNearMatch, methods deprecated in 1.27, have been removed. removed. User objects to taking UserIdentity objects. Extensions implementing this interface need to be changed accordingly. removed. Use UserGroupMembership::getGroupPage and ::getLink instead. UserGroupMembership::getLink instead. ParserOptions::getEditSection, ParserOptions::setEditSection, and ParserOutput::getEditSectionTokens, ::getTOCEnabled, ::setEditSectionTokens, and ::setTOCEnabled, deprecated in 1.31, have been removed. have been removed. use OutputPage::showFatalError or throw a FatalError instead. The methods are ::showFileCopyError, ::showFileRenameError, ::showFileDeleteError, and ::showFileNotFoundError. INTL_ICU_VERSION constant directly. both deprecated in 1.32, have been removed. been removed. Use ->msg or ->getMsg instead. use WatchAction::getWatchToken with action 'unwatch' directly. 1.28, have been removed. deprecated in 1.32, have been removed. in 1.33, have been removed. removed. updated to AbstractBlock in cases where any type of block could be expected. in 1.27, has been removed. was deprecated in 1.25. Use the mediawiki.String module instead. Use require( 'mediawiki.language.specialCharacters' ) instead. is provided by mediawiki.page.ready instead (T232688). plugin now ships as part of the 'mediawiki.util' module bundle. directly. getErrorsOrWarnings instead. SpecialPage::getPageTitle instead. jquery.ui.effect-pulsate, jquery.ui.effect-slide, jquery.ui.effect-transfer, which are no longer used, have now been removed. specified, deprecated in 1.30, have been removed. removed. Use NS_FILE and NS_FILE_TALK respectively. (deprecated in 1.32) have been removed. Closures should be used instead. ::addWikiTextTidy, ::addWikiTextTitle, deprecated in 1.32, have been removed. method, deprecated in 1.32, have been removed. Parser::fetchFileAndTitle instead. \Maintenance::countDown method instead. deprecated since 1.20. deprecated in 1.20. SearchEngine::defaultPrefixSearch or ::completionSearch methods instead. UserGroupsChanged hook. instance from MediaWikiServices instead. Use MediaWiki\Session\SessionManager instead. Use MediaWikiServices::getInstance->getDBLoadBalancerFactory. calls that use an invalid path (i.e., something other than an absolute path, protocol-relative URL, or full scheme URL), and will instead pass them to the client where they will likely 404. This usage was deprecated in 1.24. EditFilterMergedContent hook for an alternative way to use this feature. all deprecated in 1.25 and ignored, have been removed. removed. mw.util.wikiScript( 'load' ) instead. been unused since 1.16 and was deprecated in 1.22. To deprecate a property in JavaScript, use mw.log.deprecate instead. Use the 'user' module instead. removed. Use ResourceLoader::expandModuleNames instead. PermissionManager::addTemporaryUserRights instead. construct, the range of the index was 1..numRows. This has been fixed to be 0..(numRows-1). AuthChangeFormFields hook or security levels instead. Use WikiMap::getWikiIdFromDbDomain instead. which were deprecated and ignored by core since 1.22, are no longer set to any value, and SkinTemplate no longer emits a 'jsmimetype' key. Any extensions not updated since 2013 to cope with this deprecation may now break. or $wgResourceModules is no longer supported. Use the 'class' or 'factory' option of the array format instead. DummyLinker must be in type Language when present. Other types are deprecated since 1.33. have been removed. removed. use the UploadVerifyFile hook. deprecated in 1.28, have been removed. Instead, please use the getFileKey method on the response from doStashFile. in 1.33, have been removed. Use setLocalDomainPrefix instead. Use IDatabase::lastDoneWrites instead. Use LoadBalancer::laggedReplicaUsed instead. Use IDatabase::getDomainID instead. dropped. MediaWikiTestCase::resetServices. initialized after calling SearchResult::initFromTitle. should only be used to unblock a blocked user. written to $_GET. DatabaseBlock, and RecentChange, deprecated in 1.31, have been removed. Use the corresponding getQueryInfo methods instead. Use RevisionStore::getQueryInfo or RevisionStore::getArchiveQueryInfo instead. * Revision::userJoinCond * Revision::pageJoinCond * Revision::selectFields * Revision::selectArchiveFields * Revision::selectTextFields * Revision::selectPageFields * Revision::selectUserFields functions, deprecated since 1.28, have been removed. practical reasons). Use MediaWikiServices instead to get a LocalisationCache.
 * The global functions wfSuppressWarnings and wfRestoreWarnings, deprecated in
 * Preferences class, deprecated in 1.31, has been removed.
 * The following parts of code, deprecated in 1.32, were removed in favor of
 * Various Special Page PHP Classes were renamed (mostly casing changes):
 * Language::setCode, deprecated in 1.32, was removed. Use Language::factory to
 * MWNamespace::clearCaches has been removed. So has the $rebuild parameter
 * The ill-defined "DatabaseOraclePostInit" hook has been removed.
 * PreferencesFormLegacy and PreferencesForm classes, deprecated in 1.32, have
 * ObjectFactory class, deprecated in 1.31, has been removed.
 * HWLDFWordAccumudlator class, deprecated in 1.28, has been removed.
 * XMPInfo, XMPReader and XMPValidate, deprecated in 1.32, have been removed.
 * The RedirectSpecialPage::execute method could sometimes return a Title object.
 * The 'recenteditcount' response property from action API action=query
 * SearchEngine::userNamespaces, SearchEngine::namespacesAsText,
 * FileRepo::streamFile, deprecated in 1.26, has been removed.
 * User::randomPassword method, deprecated in 1.27, have been removed.
 * MWNamespace::canTalk, deprecated in 1.30, have been removed.
 * Parser class property $mUniqPrefix, deprecated in 1.26, has been removed.
 * wfArrayFilter and wfArrayFilterByKey, deprecated in 1.32, have been
 * wfMakeUrlIndexes function, deprecated in 1.33, have been removed.
 * Method signatures in WatchedItemQueryServiceExtension have changed from taking
 * User::getGroupPage and ::makeGroupLinkHTML, deprecated in 1.29, have been
 * User::makeGroupLinkWiki, deprecated in 1.29, has been removed. Use
 * SavepointPostgres, deprecated in 1.31, has been removed.
 * OutputPage::enableSectionEditLinks, OutputPage::sectionEditLinksEnabled,
 * EditPage::safeUnicodeInput and ::safeUnicodeOutput, deprecated in 1.30,
 * Four methods in OutputPage, deprecated in 1.32, have been removed. You should
 * ApiBase::truncateArray, deprecated in 1.32, has been removed.
 * IcuCollation::getICUVersion, deprecated in 1.32, has been removed. Use PHP's
 * HTMLForm::setSubmitProgressive, deprecated in 1.32, has been removed.
 * ResourceLoaderStartUpModules::getStartupModules and ::getLegacyModules,
 * BaseTemplate::msgHtml and QuickTemplate::msgHtml, deprecated in 1.32, have
 * WatchAction::getUnwatchToken, deprecated in 1.32, has been removed. Instead,
 * Language::initEncoding, ::recodeForEdit, and recodeInput, deprecated in
 * PageArchive::getTextFromRow, ::listAllPages, and ::getLastRevisionText,
 * OutputPage::getModuleScripts, ParserOutput::getModuleScripts, deprecated
 * User::getPasswordValidity, deprecated in 1.33, has been removed.
 * ApiQueryBase::prepareUrlQuerySearchString, deprecated in 1.33, has been
 * ChangeTags::purgeTagUsageCache, deprecated in 1.33, has been removed.
 * JobQueueGroup::pushLazyJobs, deprecated in 1.33, has been removed.
 * MediaWikiTestCase::stashMwGlobals, deprecated in 1.32, has been removed.
 * SearchEngine::transformSearchTerm, deprecated in 1.32, has been removed.
 * The Block typehint only refers to blocks stored in the database. It should be
 * FileRepoStatus, deprecated in 1.25, has been removed.
 * The LegacyHookPreAuthenticationProvider class, deprecated since its creation
 * IP::isValidBlock, deprecated in 1.30, has been removed.
 * WikiPage::prepareContentForEdit now doesn't accept an integer for $revision,
 * The jquery.byteLength module, deprecated in 1.31, was removed.
 * mw.language.specialCharacters, deprecated in 1.33, has been removed.
 * The jquery.colorUtil module was removed. Use jquery.color instead.
 * The jquery.checkboxShiftClick module was removed. The functionality
 * The 'jquery.accessKeyLabel' module has been removed. This jQuery
 * EditPage::submit, deprecated in 1.29, has been removed. Use $this->edit
 * HTMLForm::getErrors, deprecated in 1.28, has been removed. Use
 * SpecialPage::getTitle, deprecated in 1.23, has been removed. Use
 * jquery.ui.effect-bounce, jquery.ui.effect-explode, jquery.ui.effect-fold
 * SpecialEmailUser::validateTarget, ::getTarget without a sender/user
 * BufferingStatsdDataFactory::getBuffer, deprecated in 1.30, has been removed.
 * The constant DB_SLAVE, deprecated in 1.28, has been removed. Use DB_REPLICA.
 * The constants NS_IMAGE and NS_IMAGE_TALK, deprecated in 1.14, have been
 * Replacer, DoubleReplacer, HashtableReplacer and RegexlikeReplacer
 * OutputPage::addWikiText, ::addWikiTextWithTitle, ::addWikiTextTitleTidy,
 * The $wgUseKeyHeader configuration option and the OutputPage::getKeyHeader
 * WebInstallerOutput::addWikiText, deprecated in 1.32, has been removed.
 * Parser::fetchFile, deprecated in 1.32, has been removed. Use the method
 * The global function wfBCP47, deprecated in 1.31, has been removed.
 * wfCountDown function, deprecated in 1.31, has been removed. Use
 * OutputPage::wrapWikiMsg no longer accepts an options parameter. This was
 * Skin::outputPage no longer accepts a context. This was deprecated in 1.20.
 * Linker::link no longer accepts a string for the query array, as was
 * PrefixSearch::titleSearch, deprecated in 1.23, has been removed. Use the
 * The UserRights hook, deprecated in 1.26, has been removed. Instead, use the
 * Skin::getDefaultInstance, deprecated in 1.27, has been removed. Get the
 * The UserLoadFromSession hook, deprecated in 1.27, has been removed.
 * The wfResetSessionID global function, deprecated in 1.27, has been removed.
 * The wfGetLBFactory global function, deprecated in 1.27, has been removed.
 * The internal method OutputPage->addScriptFile will no longer silently drop
 * Database::reportConnectionError, deprecated in 1.32, has been removed.
 * APIEditBeforeSave hook, deprecated in 1.28, has been removed. Please see
 * API module methods getDescription, getParamDescription, & getExamples,
 * The API module method getDescriptionMessage, deprecated in 1.30, has been
 * The JavaScript global variable wgLoadScript has been removed. Use
 * ResourceLoader no longer creates the 'mw.legacy' placeholder object. It has
 * The 'user.groups' module, deprecated in 1.28, was removed.
 * The ResourceLoaderContext::expandModuleNames method, deprecated in 1.33, was
 * The ability to override User::$mRights has been removed. Use
 * Previously, when iterating ResultWrapper with foreach or a similar
 * The ChangePasswordForm hook, deprecated in 1.27, has been removed. Use the
 * WikiMap::getWikiIdFromDomain, deprecated in 1.33, has been removed.
 * The config variables $wgHtml5, $wgJsMimeType, and $wgXhtmlDefaultNamespace,
 * (T222637) Passing ResourceLoaderModule objects to ResourceLoader::register
 * The parameter $lang of the functions generateTOC and tocList in Linker and
 * The static properties mw.Api.errors and mw.Api.warnings, deprecated in 1.29,
 * ParserOption::getSpeculativeRevIdCallback, deprecated in 1.28, has been
 * The UploadVerification hook, deprecated in 1.28, has been removed. Instead,
 * UploadBase:: and UploadFromChunks::stashFileGetKey and stashSession,
 * LBFactory::setDomainPrefix and LoadBalancer::setDomainPrefix, deprecated
 * IDatabase::implicitGroupby, deprecated in 1.30, has been removed.
 * IDatabase::doneWrites, deprecated in 1.31, has been removed.
 * Database::reportConnectionError, deprecated in 1.32, has been removed.
 * LoadBalancer::laggedSlaveUsed, deprecated in 1.28, has been removed.
 * Database::getProperty, deprecated in 1.28, has been removed.
 * IDatabase::getWikiId, deprecated in 1.30, has been removed.
 * (T191231) Support for using Oracle or MSSQL as database backends has been
 * MessageCache::destroyInstance has been removed. Instead, call
 * SearchResult protected field $searchEngine is removed and no longer
 * The UserIsBlockedFrom hook is only called if a block is found first, and
 * Parameters for index.php from PATH_INFO, such as the title, are no longer
 * The selectFields methods on classes LocalFile, ArchivedFile, OldLocalFile,
 * The following methods on Revision, deprecated since 1.31, have been removed.
 * User::setNewpassword, deprecated in 1.27 has been removed.
 * The ObjectCache::getMainWANInstance and ObjectCache::getMainStashInstance
 * Language::$dataCache has been removed (without prior deprecation, for

Deprecations in 1.34
Instead, use ->queue. blocked from editing a particular page. Use User::getBlock or PermissionManager::isBlockedFrom or PermissionManager::userCan instead. to the BlockManager as private helper methods. instead. is deprecated. Pass only the User argument. RevisionStore is deprecated. Omit it, passing only the remaining parameters. RevisionLookup::getPreviousRevision and RevisionLookup::getNextRevision. RevisionLookup::getNextRevision is deprecated and should be omitted. HttpRequestFactory. For isValidURI, use MWHttpRequest::isValidURI. For getProxy, use (string)$wgHTTPProxy. For createMultiClient, construct a MultiHttpClient directly. engine will eventually be made the only engine for HTTP requests. RepoGroup::setSingleton, wfFindFile, and wfLocalFile are all deprecated. Use MediaWikiServices instead. Use NamespaceInfo's getSubjectPage, getTalkPage, and getAssociatedPage. database), and SystemBlock (for temporary blocks created by the system). SystemBlock should be used when creating any temporary blocks. Block is  a deprecated alias for DatabaseBlock.  Some context can be found at T224165.  MovePage::moveSubpagesIfAllowed.  PrevNextNavigationRenderer::buildPrevNextNavigation instead  BlockManager::trackBlockWithCookie and BlockManager::clearCookie instead.  DatabaseBlock::getIdFromCookieValue and AbstractBlock::shouldTrackWithCookie  are moved to internal helper methods for BlockManager::trackBlockWithCookie.  been deprecated. Inside ResourceLoaderModule subclasses, use the local methods  instead. Elsewhere, use the methods from the ResourceLoader class.  deprecated. Use Profiler::setAllowOutput and Profiler::getAllowOutput  instead.  removed in a future release.  Use the Preprocessor_Hash implementation  instead.  have been deprecated; they will be made private in the future. only populated by few search engine implementations. Use SqlSearchResult::getTermMatches if really needed. and should no longer be passed. Search engine implemenations should be responsible for carrying relevant information needed for highlighting with their own SearchResultSet/SearchResult sub-classes. SearchDatabase. hooks is highly discouraged as it's only populated by SearchDatabase search engines. template option 'searchaction' instead. Use OutputPage::getRevisionId and OutputPage::isRevisionCurrent instead. been deprecated. Use FileBackend::getDomainId instead. PermissionManager::getUserPermissions instead. to be prevented. Modifying the $purgeBlobs parameter now has no effect. use SVGReader->getMetadata directly. $mTimestamp, $mExpiry, $mHideName. Use the getters/setters instead. $mParentBlockId. To check for an autoblock use DatabaseBlock::getType; to check for the parent ID, use DatabaseBlock::getParentBlockId. $contextlines and $contextchars to the SearchHighlighter methods, they will use proper defaults defined in SearchHighlighter::DEFAULT_CONTEXT_LINES and DEFAULT_CONTEXT_CHARS. or a string as the content will produce a deprecation warning. directly from the Content object. deprecation above this method is no longer needed/called and should not be implemented by SearchEngine implementation. MediaWikiServices::getMessageCache. MediaWikiServices::getMainWANObjectCache instead. MediaWikiServices::getMainWANObjectCache instead. SearchResult::newFromTitle. This class is being refactored into an abstract class. If you extend this class please be sure to override all its methods or extend RevisionSearchResult. the SpecialPage_initList hook or by adding to $wgSpecialPages) is now deprecated.  Use Html::errorBox or Html::warningBox instead.  'rc_user', 'log_user', and 'ipb_by' is deprecated. Queries should be adjusted  to use the corresponding actor fields directly. Note that use with  'rev_user' is *not* deprecated at this time.  ApiModuleManager::addModule is now deprecated. The ObjectFactory spec should  be used instead.  system block that hides the user.  remove a block.  Use HTTPFileStreamer::send404Message and HTTPFileStreamer::parseRange  respectively instead.  users from sending emails, use  $wgGroupPermissions['sysop']['blockemail'] = true;  ApiQueryBlockInfoTrait instead.  regardless of the runtime environment. This is part of the continuing work to  remove HHVM support from MediaWiki, which started in MediaWiki 1.31.  instead.  isValidCode, isValidBuiltInCode, isKnownLanguageTag, fetchLanguageNames, fetchLanguageName, getFileName, getMessagesFileName, getJsonMessagesFileName. Use the new LanguageNameUtils class instead. (Note that fetchLanguageName(s) are called getLanguageName(s) in the new class.)
 * The MWNamespace class is deprecated. Use NamespaceInfo.
 * ExtensionRegistry->load is deprecated, as it breaks dependency checking.
 * User::isBlocked is deprecated since it does not tell you if the user is
 * User::isLocallyBlockedProxy and User::inDnsBlacklist are deprecated and moved
 * User::isDnsBlacklisted is deprecated. Use BlockManager::isDnsBlacklisted
 * The Config argument to ChangesListSpecialPage::checkStructuredFilterUiEnabled
 * WatchedItem::getUser is deprecated. Use getUserIdentity.
 * Passing a Title as the first parameter to the getTimestampById method of
 * Title::getPreviousRevisionId and Title::getNextRevisionId are deprecated. Use
 * The Title parameter to RevisionLookup::getPreviousRevision and
 * MWHttpRequest::factory is deprecated. Use HttpRequestFactory.
 * The Http class is deprecated. For the request, get, and post methods, use
 * Http::$httpEngine is deprecated and has no replacement. The default 'guzzle'
 * RepoGroup::singleton, RepoGroup::destroySingleton,
 * The getSubjectPage, getTalkPage, and getOtherPage of Title are deprecated.
 * MWMessagePack class, no longer used, has been deprecated in 1.34.
 * The Block class is separated into DatabaseBlock (for blocks stored in the
 * Parser::$mConf is deprecated. It will be removed entirely in a later version.
 * Constructing Parser directly is deprecated. Obtain one from ParserFactory.
 * Title::moveSubpages is deprecated. Use MovePage::moveSubpages or
 * The MWNamespace class is deprecated. Use MediaWikiServices::getNamespaceInfo.
 * (T62260) Hard deprecate Language::getExtraUserToggles method.
 * Language::viewPrevNext function is deprecated, use
 * User::trackBlockWithCookie and DatabaseBlock::clearCookie are deprecated. Use
 * DatabaseBlock::setCookie, DatabaseBlock::getCookieValue,
 * ResourceLoaderContext::getConfig and ResourceLoaderContext::getLogger have
 * The Profiler::setTemplated and Profiler::getTemplated methods have been
 * The Preprocessor_DOM implementation has been deprecated. It will be
 * Sanitizer::attributeWhitelist and Sanitizer::setupAttributeWhitelist
 * SearchResult::termMatches method is deprecated. It was unreliable because
 * SearchResult::getTextSnippet( $terms ) the $terms param is being deprecated
 * SearchResultSet::free method is deprecated.
 * SearchEngine::$searchTerms protected field is deprecated. Moved to
 * The use of the $terms param in the ShowSearchHit and ShowSearchHitTitle
 * Skin::escapeSearchLink is deprecated. Use Skin::getSearchLink or the skin
 * Skin::getRevisionId and Skin::isRevisionCurrent have been deprecated.
 * LoadBalancer::haveIndex and LoadBalancer::isNonZeroLoad have
 * FileBackend::getWikiId has been deprecated.
 * User::getRights and User::$mRights have been deprecated. Use
 * The LocalisationCacheRecache hook no longer allows purging of message blobs
 * SVGMetadataExtractor::getMetadata has been deprecated. Instead, you should
 * The following public properties on AbstractBlock are deprecated: $mReason,
 * The following public properties on DatabaseBlock are deprecated: $mAuto,
 * SearchEngine::userHighlightPrefs is deprecated, simply stop passing
 * SearchUpdate constructor: passing a string as the title param and or a boolean
 * SearchEngine::getTextFromContent is deprecated, use getTextForSearchIndex
 * SearchEngine::textAlreadyUpdatedForIndex is deprecated, given the
 * IDatabase::bufferResults has been deprecated. Use query batching instead.
 * MessageCache::singleton is deprecated. Use
 * ObjectCache::getWANInstance is deprecated. Use
 * ObjectCache::newWANCacheFromParams is deprecated. Use
 * Constructing MovePage directly is deprecated. Use MovePageFactory.
 * TempFSFile::factory has been deprecated. Use TempFSFileFactory instead.
 * wfIsBadImage is deprecated. Use the BadFileLookup service instead.
 * Building a new SearchResult is hard-deprecated, always call
 * Skin::getSkinNameMessages is deprecated and no longer used.
 * The mediawiki.RegExp module is deprecated; use mw.util.escapeRegExp instead.
 * Specifying a SpecialPage object for the list of special pages (either through
 * WebInstaller::getInfoBox, getWarningBox and getErrorBox are deprecated.
 * Use of ActorMigration with 'ar_user', 'img_user', 'oi_user', 'fa_user',
 * Specifying both the class and factory parameters for
 * The UserIsHidden hook is deprecated. Use GetUserBlock instead, and add a
 * The GetBlockedStatus hook is deprecated. Use GetUserBlock instead, to add or
 * $wgContentHandlerUseDB is deprecated and should always be true.
 * StreamFile::send404Message and StreamFile::parseRange are now deprecated.
 * Global variable $wgSysopEmailBans is deprecated; to allow sysops to ban
 * ApiQueryBase::showHiddenUsersAddBlockInfo is deprecated. Use
 * PasswordReset is now a service, its direct instantiation is deprecated.
 * RESTBagOStuff users should specify either "JSON" or "PHP" serialization type.
 * The global function wfIsHHVM is deprecated and will now always return false
 * Language::getLocalisationCache is deprecated. Use MediaWikiServices
 * The following Language methods are deprecated: isSupportedLanguage,

Other changes in 1.34
"..." as the only author name. If the "author" array contains more than one entry and "..." is one of the entries in the array, "..." will be parsed as "others" (version-poweredby-others i18n message) like previously.
 * Added option to specify "Various authors" as author in extension credits using

Compatibility
MediaWiki 1.34 requires PHP 7.2.9 or later, and the following PHP extensions:


 * ctype
 * dom
 * fileinfo
 * iconv
 * json
 * mbstring
 * xml

MySQL/MariaDB is the recommended DBMS. PostgreSQL or SQLite can also be used, but support for them is somewhat less mature.

The supported versions are:


 * MySQL 5.5.8 or later
 * PostgreSQL 9.2 or later
 * SQLite 3.8.0 or later

Online documentation
Documentation for both end-users and site administrators is available on MediaWiki.org, and is covered under the GNU Free Documentation License (except for pages that explicitly state that their contents are in the public domain):

https://www.mediawiki.org/wiki/Special:MyLanguage/Documentation

Mailing list
A mailing list is available for MediaWiki user support and discussion:

https://lists.wikimedia.org/mailman/listinfo/mediawiki-l

A low-traffic announcements-only list is also available:

https://lists.wikimedia.org/mailman/listinfo/mediawiki-announce

It's highly recommended that you sign up for one of these lists if you're going to run a public MediaWiki, so you can be notified of security fixes.

IRC help
There's usually someone online in #mediawiki on irc.freenode.net.