Security reminder: If you have PHP's register_globals option set, you must turn it off. MediaWiki will not work with it enabled. == MediaWiki 1.27 == THIS IS NOT A RELEASE YET MediaWiki 1.27 is an alpha-quality branch and is not recommended for use in production. === Configuration changes in 1.27 === * $wgUseLinkNamespaceDBFields was removed. * Deprecated $wgResourceLoaderMinifierStatementsOnOwnLine and $wgResourceLoaderMinifierMaxLineLength, because there was little value in making the behavior configurable. The default values (`false` for the former, 1000 for the latter) are now hard-coded. * $wgDebugDumpSqlLength was removed (deprecated in 1.24). * $wgDebugDBTransactions was removed (deprecated in 1.20). * $wgUseXVO has been removed, as it provides functionality only used by custom Wikimedia patches against Squid 2.x that probably noone uses in production anymore. There is now $wgUseKeyHeader that provides similar functionality but instead of the MediaWiki-specific X-Vary-Options header, uses the draft Key header standard. * $wgScriptExtension (and support for '.php5' entry points) was removed. See the deprecation notice in the release notes for version 1.25 for advice on how to preserve support for '.php5' entry points via URL rewriting. * Password handling via the User object has been deprecated and partially removed, pending the future introduction of AuthManager. In particular: ** expirePassword(), getPasswordExpireDate(), resetPasswordExpiration(), and getPasswordExpired() have been removed. They were unused outside of core. ** The mPassword, mNewpassword, mNewpassTime, and mPasswordExpires fields are now private and will be removed in the future. ** The getPassword() and getTemporaryPassword() methods now throw BadMethodCallException and will be removed in the future. ** The ability to pass 'password' and 'newpassword' to createNew() has been removed. The only users of it seem to have been using it to set invalid passwords, and so shouldn't be greatly affected. ** setPassword(), setInternalPassword(), and setNewpassword() have been deprecated, pending the introduction of AuthManager. ** User::randomPassword() is deprecated in favor of a new method PasswordFactory::generateRandomPasswordString() ** User::getPasswordFactory() is deprecated, callers should just create a PasswordFactory themselves. ** A new constructor, User::newSystemUser(), has been added to simplify the creation of passwordless "system" users for logged actions. * $wgMaxSquidPurgeTitles was removed. * $wgAjaxWatch was removed. This is now enabled by default. * $wgUseInstantCommons now hotlinks Commons images by default instead of downloading originals and thumbnailing them locally. This allows wikis to save on CPU and bandwidth while reducing time to first byte for pages, even without a thumbnail handler. See $wgForeignFileRepos documentation for tweaks. * (T27397) WebP is enabled by default as an uploadable filetype. * (T48998) $wgArticlePath must now be either a full url, or start with a "/". * $wgRateLimitLog was removed; use $wgDebugLogGroups['ratelimit'] instead. * Deprecated API formats dbg, txt, and yaml have been removed. * CLDRPluralRule* classes have been replaced with wikimedia/cldr-plural-rule-parser. * Removed $wgProfilePerHost, $wgUDPProfilerHost, $wgUDPProfilerPort, $wgUDPProfilerFormatString, $wgStatsMethod, $wgAggregateStatsID, $wgStatsFormatString, and $wgProfileCallTree (deprecated since 1.20). * For proper operation of LocalIdLookup with shared user tables, ensure that $wgSharedDB and $wgSharedTables are properly set even on the "central" wiki that all others are sharing from and that $wgLocalDatabases is set to the full list of sharing wikis on all those wikis. === New features in 1.27 === * $wgDataCenterId and $wgDataCenterRoles where added, which will serve as basic configuration settings needed for multi-datacenter setups. $wgDataCenterUpdateStickTTL was also added. * Added a new hook, 'UserMailerTransformContent', to transform the contents of an email. This is similar to the EmailUser hook but applies to all mail sent via UserMailer. * Added a new hook, 'UserMailerTransformMessage', to transform the contents of an emai after MIME encoding. * Added a new hook, 'UserMailerSplitTo', to control which users have to be emailed separately (ie. there is a single address in the To: field) so user-specific changes to the email can be applied safely. * $wgCdnMaxageLagged was added, which limits the CDN cache TTL when any load balancer uses a DB that is lagged beyond the 'max lag' setting in the relevant section of $wgLBFactoryConf. * User::newSystemUser() may be used to simplify the creation of passwordless "system" users for logged actions from scripts and extensions. * Extensions can now return detailed error information via the API when preventing user actions using 'getUserPermissionsErrors' and similar hooks by using ApiMessage instances instead of strings for the $result value. * $wgAPIMaxLagThreshold was added to limit bot changes when databases lag becomes too high. * Skins and extensions can now use FlexBox mixins (.flex-display(@display: flex) and .flex(@grow: 1, @shrink: 1, @width: auto, @order: 1)) in Less to create cross-browser-compatible FlexBox rules. Users will still need to add fallback float rules or the like for compatibility with IE9- separately. * Added MWTimestamp::getTimezoneString() which returns the localized timezone string, if available. To localize this string, see the comments of $wgLocaltimezone in includes/DefaultSettings.php. * Added CentralIdLookup, a service that allows extensions needing a concept of "central" users to get that without having to know about specific central authentication extensions. * $wgMaxUserDBWriteDuration added to limit huge user-generated transactions. Regular web request transactions that takes longer than this are aborted. * Added a new hook, 'TitleMoveCompleting', which runs before a page move is committed. * $wgCdnReboundPurgeDelay was added to provide secondary delayed purges of URLs from CDN to mitigate DB replication lag and WAN cache purge lag. === External library changes in 1.27 === ==== Upgraded external libraries ==== * Updated oojs/oojs-ui from v0.12.12 to v0.13.3. * Updated composer/semver from v1.0.0 to v1.2.0. * Update liuggio/statsd-php-client to 1.0.18. ==== New external libraries ==== * Added wikimedia/base-convert v1.0.1. * Added wikimedia/cldr-plural-rule-parser v1.0.0. * Added wikimedia/relpath v1.0.3. * Added wikimedia/running-stat v1.1.0. ==== Removed and replaced external libraries ==== === Bug fixes in 1.27 === * Special:Upload will now display correct maximum allowed file size when running under HHVM (T116347). === Action API changes in 1.27 === * Added list=allrevisions. * generator=recentchanges now has the option to generate revids. * ApiPageSet::setRedirectMergePolicy() was added. This allows generator modules to define how generator data for a redirect source gets merged into the redirect destination. * prop=imageinfo&iiprop=uploadwarning will no longer include the possibility of "was-deleted" warning. * Added difftotextpst to query=revisions which preforms a pre-save transform on the text before diffing it. * Deprecated formats dbg, txt, and yaml have been removed. * (T47988) The protect log event details now use new-style formatting. * The following response properties from action=login are deprecated, and may be removed in the future: lgtoken, cookieprefix, sessionid. Clients should handle cookies to properly manage session state. === Action API internal changes in 1.27 === * ApiQueryORM removed. * The following classes have been removed: ** ApiFormatDbg ** ApiFormatTxt ** ApiFormatYaml * ApiQueryBase::titleToKey(), ApiQueryBase::keyToTitle() and ApiQueryBase::keyPartToTitle() all removed (deprecated since 1.24). * ApiQueryBase::checkRowCount() was removed (deprecated since 1.24). * ApiQueryBase::getDirectionDescription() was removed (deprecated since 1.25). * ApiQuery::getModules() was removed (deprecated since 1.21). * ApiMain::getModules() was removed (deprecated since 1.21). === Languages updated in 1.27 === 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. * (T113688) Change default numerals from Gurmukhi to Arabic for Punjabi locale. === Other changes in 1.27 === * ProfilerOutputUdp was removed. Note that there is a ProfilerOutputStats class. * WikiPage::doDeleteArticleReal() and WikiPage::doDeleteArticle() now ignore the 2nd and 3rd arguments (formerly $id and $commit). * Removed "loaderScripts" option from ResourceLoaderFileModule class. * Removed ORM-like wrapper added in 1.20. * LinkCache::getGoodLinks and LinkCache::getBadLinks were removed (deprecated in 1.26). * WikiPage::doQuickEdit() was removed (deprecated since 1.21). * Removed SiteObject and SiteArray classes (deprecated in 1.21). * MessageBlobStore::getInstance() was removed (deprecated since 1.25). * (T84937) Free external links ("autolinked" urls) will now be terminated by   and HTML entity encodings of  , <, and >. * (T36948) The default file revert message's timestamp is now in $wgLocaltimezone, instead of UTC. * The default name of the 'suppress' group page has been changed from 'Project:Oversight' to 'Project:Suppress'. * DatabaseBase::resultObject() is now protected (use outside Database classes not necessary since 1.11). * Calling ResourceLoaderFileModule::readStyleFiles() without a ResourceLoaderContext instance is deprecated. * ResourceLoader::getLessCompiler() now takes an optional parameter of additional LESS variables to set for the compiler. * wfBaseConvert() marked as deprecated, use Wikimedia\base_convert() directly instead. * Obsolete maintenance scripts clearCacheStats.php and showCacheStats.php were removed. The underlying data is sent to StatsD (see $wgStatsdServer). * Removed msg_resource_links database table and associated code. * Removed msg_resource database table and associated code. * Skin::getNamespaceNotice() was removed. * wfIsConfiguredProxy() was removed (deprecated since 1.24). * wfDebugTimer() was removed (deprecated since 1.25). * wfIsTrustedProxy() was removed (deprecated since 1.24). * wfGetIP() was removed (deprecated since 1.19). * MWHookException was removed. * OutputPage::appendSubtitle() was removed (deprecated since 1.19). * OutputPage::loginToUse() was removed (deprecated since 1.19). * Article::loadContent() was removed (deprecated since 1.19). * User::editToken() was removed (deprecated since 1.19). * Removed --force-normal option of dumpBackup.php, as it no longer served any useful purpose since 1.22. * The functions processOption() and processArgs() on the BackupDumper and TextPassDumper classes have been removed. * The maintenance/backupTextPass.inc file was deleted. You should include maintenance/dumpTextPass.php instead. * WikiPage::getUsedTemplates() was removed (deprecated since 1.19). * wfEmptyMsg() was removed (deprecated since 1.18). * OutputPage::permissionRequired() was removed (deprecated since 1.18). * OutputPage::blockedPage() was removed (deprecated since 1.18). * User::getSkin() was removed (deprecated since 1.18). * OutputPage::includeJQuery() was removed (deprecated since 1.17). * WikiPage::updateRestrictions() was removed (deprecated since 1.19). * WikiPage::testPreSaveTransform() was removed (deprecated since 1.19). * LogPage::logName() was removed (deprecated since 1.19). * LogPage::logHeader() was removed (deprecated since 1.19). * wfCheckLimits() was removed (deprecated since 1.24). * Linker::makeKnownLinkObj() was removed (deprecated since 1.16). * Linker::makeLinkObj() was removed (deprecated since 1.16). * wfMsgForContentNoTrans() was removed (deprecated since 1.18). * ChangesList::usePatrol was removed (deprecated since 1.22). * wfMsgNoTrans() was removed (deprecated since 1.18). * Linker::makeImageLink2 was removed (deprecated since 1.20). * Title::userIsWatching() was removed (deprecated since 1.20). * Removed WaitForSlave maintenance script; use SELECT MASTER_POS_WAIT() database function directly instead. * wfMsg() was removed (deprecated since 1.18). * wfMsgForContent() was removed (deprecated since 1.18). * wfMsgReal() was removed (deprecated since 1.18). * wfMsgGetKey() was removed (deprecated since 1.18). * wfMsgHtml() was removed (deprecated since 1.18). * wfMsgWikiHtml() was removed (deprecated since 1.18). * wfMsgExt() was removed (deprecated since 1.18). == Compatibility == MediaWiki 1.27 requires PHP 5.3.3 or later. There is experimental support for HHVM 3.3.0. MySQL is the recommended DBMS. PostgreSQL or SQLite can also be used, but support for them is somewhat less mature. There is experimental support for Oracle and Microsoft SQL Server. The supported versions are: * MySQL 5.0.3 or later * PostgreSQL 8.3 or later * SQLite 3.3.7 or later * Oracle 9.0.1 or later * Microsoft SQL Server 2005 (9.00.1399) == Upgrading == 1.27 has several database changes since 1.26, 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). If upgrading from before 1.11, and you are using a wiki as a commons repository, make sure that it is updated as well. Otherwise, errors may arise due to database schema changes. If upgrading from before 1.7, you may want to run refreshLinks.php to ensure new database fields are filled with data. If you are upgrading from MediaWiki 1.4.x or earlier, you should upgrade to 1.5 first. The upgrade script maintenance/upgrade1_5.php has been removed with MediaWiki 1.21. Don't forget to always back up your database before upgrading! See the file UPGRADE for more detailed upgrade instructions. For notes on 1.26.x and older releases, see HISTORY. == 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/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.