RELEASE-NOTES-1.31

   1 == MediaWiki 1.31.1 ==
   2
   3 This is a security and maintenance release of the MediaWiki 1.31 branch.
   4
   5 === Changes since MediaWiki 1.31.0 ===
   6 * (T169545, CVE-2018-0503) SECURITY: $wgRateLimits entry for 'user' overrides
   7   'newbie'.
   8 * (T194605, CVE-2018-0505) SECURITY: BotPasswords can bypass CentralAuth's
   9   account lock.
  10 * (T199029, CVE-2018-13258) SECURITY: Tarball was missing .htaccess files.
  11 * (T197229) Bundle Nuke extension, it was accidentally omitted.
  12 * (T193995) Fix undefined patchPath() method call in parser tests.
  13 * (T198687) Fix various selectFields methods to use the string 'NULL', not null.
  14 * Special:BotPasswords now requires reauthentication.
  15 * (T191608, T187638) Add 'logid' parameter to Special:Log.
  16 * (T193829) Indicate when a Bot Password needs reset.
  17 * (T198037) GitInfo: Don't try shelling out if it's disabled.
  18 * (T151415) Log email changes.
  19 * (T197206) Fix performance regression when multiple DB used without caching.
  20 * (T197030) PHPSessionHandler: Suppress headers warnings in initialize().
  21 * (T182377, T196793) Exif: Guard against uncountable tag values.
  22 * (T200861) Fix total breakage of SQLite web upgrade.
  23 * (T200864) Fix pingback over-reporting on non-MySQL databases
  24 * (T202550) Unbreak SpecialListusersHeaderForm and SpecialListusersHeader
  25   hooks.
  26
  27 === Changes since MediaWiki 1.31.0-rc.2 ===
  28 * (T195783) Initialize PSR-4 namespaces at same stage as normal autoloader.
  29 * (T196092) Hide MySQL binary/utf-8 charset option in the installer.
  30 * (T196185) Don't allow setting $wgDBmysql5 in the installer.
  31 * (T196125) php-memcached 3.0 (provided with PHP 7.0) is now supported.
  32 * (T182366) UploadBase::checkXMLEncodingMissmatch() now works on PHP 7.1+
  33 * (T118683) Fix exception from &$user deref on HHVM in the TitleMoveComplete hook.
  34 * (T196672) The mtime of extension.json files is now able to be zero
  35 * (T180403) Validate $length in padleft/padright parser functions.
  36 * (T143790) Make $wgEmailConfirmToEdit only affect edit actions.
  37
  38 === Changes since MediaWiki 1.31.0-rc.0 ===
  39 * (T33223) Drop archive.ar_text and ar_flags.
  40 * Add default edit rate limit of 90 edits/minute for all users.
  41 * (T187645) Use codepoint as tiebreaker when getting first-letters in
  42   IcuCollation.
  43 * (T191947) Don't shell during the installer if shelling out is disabled.
  44 * (T194319) Improve duplicate config setting exception as part of extension
  45   registration.
  46 * (T195211) Don't require trailing slash in PSR-4 autoloader directory.
  47 * (T186565) Fix PHP Notice from `ob_end_flush()` in `FileRepo::streamFile()`.
  48 * Do not incorrectly hide namespace input field in the installer.
  49 * (T186456) Refactor checks looking for PEAR maik libraries to be clearer.
  50
  51 === Important pre-upgrade notes for 1.31 ===
  52 * If you're using MySQL, SQLite, or MSSQL, are not using update.php to apply
  53   schema changes, and cannot have downtime to run migrateArchiveText.php and
  54   apply patch-drop-ar_text.sql manually, you'll have to apply a default value
  55   to the ar_text and ar_flags columns of the archive table or make those
  56   columns nullable before upgrading to MediaWiki 1.31.
  57   maintenance/archives/patch-nullable-ar_text.sql shows how to do this for MySQL.
  58
  59 === Configuration changes in 1.31 ===
  60 * $wgEnableAPI and $wgEnableWriteAPI are now deprecated and will be removed in
  61   a future version. The API is now considered to be stable, secure and
  62   essential.
  63 * $wgUsejQueryThree was removed, as it is now the default. This was documented
  64   as a temporary variable during the migration period, deprecated since 1.29.
  65 * $wgLogoHD has been updated to support svg images and uses $wgLogo where
  66   possible for fallback images such as png.
  67 * (T44246) $wgFilterLogTypes will no longer ignore 'patrol' when user does not
  68   have the right to mark things patrolled.
  69 * Wikis that contain imported revisions or CentralAuth global blocks should run
  70   maintenance/cleanupUsersWithNoId.php.
  71 * The configuration settings $wgResourceLoaderMinifierStatementsOnOwnLine and
  72   $wgResourceLoaderMinifierMaxLineLength, deprecated since 1.27, were removed.
  73 * (T180921) $wgReferrerPolicy now supports having fallbacks for browsers that
  74   are not using the latest version of the Referrer Policy specification.
  75 * $wgFragmentMode is now set to [ 'legacy', 'html5' ] by default. This is a
  76   first step of migration to human-readable section IDs that will later result
  77   in 'html5' being the default mode.
  78 * CACHE_ACCEL now only supports APC(u) or WinCache. XCache support was removed
  79   as upstream is inactive and has no plans to move to PHP 7.
  80 * The old CategorizedRecentChanges feature, including its related configuration
  81   option $wgAllowCategorizedRecentChanges, has been removed.
  82 * (T188472) The 'comma' value for $wgArticleCountMethod is no longer supported
  83   for performance reasons, and installations with this setting will now work as
  84   if it was configured with 'any'.
  85 * (T185753) MediaWiki now defaults to using RemexHtml to tidy up user input,
  86   rather than being off by default. If you wish to disable HTML tidying
  87   entirely, set $wgTidyConfig to null; if you wish to use the old, deprecated
  88   Tidy external binary, both set $wgTidyConfig to null and $wgUseTidy to true.
  89 * $wgLogAutopatrol now defaults to false instead of true.
  90 * $wgValidateAllHtml was removed and will be ignored.
  91 * $wgScriptExtension, deprecated and ignored since 1.25, was removed. See the
  92   1.25 release notes for more information.
  93 * $wgUseAjax is now marked as deprecated, just like the deprecated AJAX
  94   framework that it enables. Some extensions mistakenly used this to check
  95   whether any AJAX functionality at all should be enabled, further making this
  96   problematic to retain.
  97 * $wgDBmysql5 is now deprecated, and will be removed in a future version. It
  98   has been marked as experimental ever since it was introduced.
  99
 100 === New features in 1.31 ===
 101 * (T76554) User sub-pages named ….json are now protected in the same way that
 102   ….js and ….css pages are, so that configuration options can safely be placed
 103   there.
 104 * Wikimedia\Rdbms\IDatabase->select() and similar methods now support joins
 105   with parentheses for grouping.
 106 * As a first pass in standardizing dialog boxes across the MediaWiki product,
 107   Html class now provides helper methods for messageBox, successBox, errorBox
 108   and warningBox generation.
 109 * (T9240) Imports will now record unknown (and, optionally, known) usernames in
 110   a format like "iw>Example".
 111 * (T20209) Linker (used on history pages, log pages, and so on) will display
 112   usernames formed like "iw>Example" as interwiki links, as if by wikitext like
 113   [[iw:User:Example|iw>Example]].
 114 * (T111605) The 'ImportHandleUnknownUser' hook allows extensions to auto-create
 115   users during an import.
 116 * Added a hook, ParserOutputPostCacheTransform, to allow extensions to affect
 117   the ParserOutput::getText() post-cache transformations.
 118 * Added a hook, UploadForm:getInitialPageText, to allow extensions to alter the
 119   initial page text for file uploads.
 120 * (T181651) The info page for File pages now displays the file's base-16 SHA1
 121   hash value in the table of basic information.
 122 * Style tags with a 'data-mw-deduplicate' attribute will be deduplicated as a
 123   ParserOutput::getText() post-cache transformation. This may be disabled by
 124   passing 'deduplicateStyles' => false to that method.
 125 * The identity of the logged-in or IP "actor" for logged actions is being moved
 126   into a new actor table, with the rows in tables such as revision and logging
 127   referring to the actor ID instead of storing the user ID and name/IP in
 128   every row.
 129   * This is currently gated by $wgActorTableSchemaMigrationStage. Most wikis
 130     can set this to MIGRATION_NEW and run maintenance/migrateActors.php as
 131     soon as any necessary extensions are updated.
 132   * Most code accessing rows for logged actions from the database should use
 133     the relevant getQueryInfo() methods to get the information needed to build
 134     the SQL query. The ActorMigration class may also be used to get feature
 135     -flagged information needed to access actor-related fields during the
 136     migration period.
 137 * Added Wikimedia\Rdbms\IDatabase::cancelAtomic(), to roll back an atomic
 138   section without having to roll back the whole transaction.
 139 * Wikimedia\Rdbms\IDatabase::doAtomicSection(), non-native ::insertSelect(),
 140   and non-MySQL ::replace() and ::upsert() no longer roll back the whole
 141   transaction on failure.
 142 * (T189785) Added a monthly heartbeat ping to the pingback feature.
 143 * The CLI installer (maintenance/install.php) learned to detect and include
 144   extensions. Pass --with-extensions to enable that feature.
 145 * (T184791) rc_patrolled now has three states: "0" for unpatrolled,
 146   "1" for manually patrolled and "2" for autopatrolled actions.
 147 * Extensions can now set their type to "editor" if they provide an editor or
 148   enhance the editing experience.
 149 * Extensions can use a PSR-4 autoloader by setting an "AutoloadNamespaces"
 150   property in extension.json. See the documentation at
 151   <https://mediawiki.org/wiki/Manual:Extension.json/Schema#AutoloadNamespaces>
 152   for more details and an example.
 153 * (T19099) Tabs which link to pages that don't exist (like those to uncreated
 154   discussion pages) now have a tooltip to indicate state, not just colour.
 155
 156 === External library changes in 1.31 ===
 157 * pear/mail, pear/mail_mime and pear/mail_mime-decode have been moved from
 158   suggested to required. These packages now must be installed via composer
 159   and not via PEAR itself.
 160
 161 ==== Upgraded external libraries ====
 162 * Updated jquery.chosen from v0.9.14 to v1.8.2.
 163 * Updated composer/spdx-licenses from 1.1.4 to 1.3.0 (development dependency).
 164 * Updated nikic/php-parser from 2.1.0 to 3.1.3 (development dependency).
 165 * Updated wikimedia/ip-set from 1.1.0 to 1.2.0.
 166 * Updated wikimedia/relpath from 2.0.0 to 2.1.1.
 167 * Updated wikimedia/running-stat from 1.1.0 to 1.2.0.
 168 * Updated wikimedia/wrappedstring from 2.2.0 to 2.3.0.
 169 * Updated mediawiki/at-ease from 1.1.0 to 1.2.0.
 170 * Updated wikimedia/php-session-serializer from 1.0.4 to 1.0.6.
 171 * Updated wikimedia/remex-html from 1.0.2 to 1.0.3.
 172 * Updated wikimedia/html-formatter from 1.0.1 to 1.0.2.
 173
 174 ==== New external libraries ====
 175 * Added wikimedia/object-factory 1.0.0
 176
 177 ==== Removed and replaced external libraries ====
 178 * (T17845) The deprecated 'jquery.badge' module was removed.
 179 * The deprecated 'jquery.autoEllipsis' module was removed. Use the CSS
 180   text-overflow property instead.
 181 * The deprecated 'jquery.placeholder' module was removed.
 182 * The deprecated 'jquery.appear' module was removed. Use the
 183   'mediawiki.viewport' module instead.
 184 * mediawiki/at-ease was replaced with wikimedia/at-ease.
 185
 186 === Bug fixes in 1.31 ===
 187 * (T90902) Non-breaking space in header ID breaks anchor.
 188 * (T189375) CSSMin now allows quoted urls in `url()` syntax to start with a
 189   space.
 190 * (T2087, T10897, T87753, T174639) Whitespace created by category and language
 191   links is now stripped rather than leaving blank lines in odd places.
 192 * (T3780) Uploads with UTF-8 names now work on PHP7.1+ on Windows servers.
 193 * (T182366) UploadBase::checkXMLEncodingMissmatch() now works on PHP 7.1+
 194
 195 === Action API changes in 1.31 ===
 196 * (T185058) The 'name' value to tgprop for action=query&list=tags has been
 197   removed. It has never made a difference in the output, the name was always
 198   returned regardless.
 199 * The 'watch' and 'unwatch' parameters for action=move have been removed. They
 200   were deprecated and also accidentally nonfunctional since 1.17 in 2010. Use
 201   'watchlist' instead.
 202
 203 === Action API internal changes in 1.31 ===
 204 * ApiBase::getProfileDBTime, deprecated since 1.25, was removed.
 205 * ApiBase::getModuleProfileName, deprecated since 1.25, was removed.
 206 * ApiBase::getProfileTime, deprecated since 1.25, was removed.
 207
 208 === Languages updated in 1.31 ===
 209 MediaWiki supports over 350 languages. Many localisations are updated
 210 regularly. Below only new and removed languages are listed, as well as
 211 changes to languages because of Phabricator reports.
 212
 213 * (T180052) Mirandese (mwl) now supports gendered NS_USER/NS_USER_TALK.
 214 * (T182305) New language support: Nyungar (nys).
 215 * (T186359) New language support: Siberian Tatar [cебертатар] (sty).
 216 * (T186635) New language support: Guianan Creole (gcr).
 217 * (T186647) New language support: Kumyk [къумукъ] (kum).
 218 * (T187750) New language support: Spanish formal address (es-formal).
 219 * (T187824) New language support: Hungarian formal address (hu-formal).
 220 * (T189127) New language support: Gorontalo (gor).
 221
 222 === Breaking changes in 1.31 ===
 223 * MessageBlobStore::insertMessageBlob(), deprecated in 1.27, was removed.
 224 * The OutputPage class constructor now requires a context parameter.
 225   Instantiating without context was deprecated in 1.18.
 226 * The mw.page JavaScript singleton, deprecated in 1.30, was removed.
 227 * Article::getLastPurgeTimestamp(), WikiPage::getLastPurgeTimestamp(), and the
 228   related WikiPage::PURGE_* constants, deprecated in 1.29, were removed.
 229 * The Article::selectFields(), ::onArticleCreate(), ::onArticleDelete(), and
 230   ::onArticleEdit() methods, deprecated in 1.24, were removed.
 231 * Installer::locateExecutable() and ::locateExecutableInDefaultPaths() were
 232   removed. Use ExecutableFinder::findInDefaultPaths() instead.
 233 * The deprecated MW_DIFF_VERSION constant was removed.
 234   DifferenceEngine::MW_DIFF_VERSION should be used instead.
 235 * Due to significant refactoring, method ContribsPager::getUserCond() that had
 236   no access restriction has been removed.
 237 * The Block class will no longer accept usable-but-missing usernames for
 238   'byText' or ->setBlocker(). Callers should either ensure the blocker exists
 239   locally or use a new interwiki-format username like "iw>Example".
 240 * The following methods and constants from the WatchedItem class, which were
 241   deprecated in 1.27, have been removed:
 242   * WatchedItem::getTitle()
 243   * WatchedItem::fromUserTitle()
 244   * WatchedItem::addWatch()
 245   * WatchedItem::removeWatch()
 246   * WatchedItem::isWatched()
 247   * WatchedItem::duplicateEntries()
 248   * WatchedItem::IGNORE_USER_RIGHTS
 249   * WatchedItem::CHECK_USER_RIGHTS
 250   * WatchedItem::DEPRECATED_USAGE_TIMESTAMP
 251 * The $statementsOnOwnLine parameter of JavaScriptMinifier::minify was removed.
 252   $wgResourceLoaderMinifierStatementsOnOwnLine, the corresponding configuration
 253   variable, has been deprecated since 1.27 and was removed as well.
 254 * The $maxLineLength parameter of JavaScriptMinifier::minify was removed.
 255   $wgResourceLoaderMinifierMaxLineLength, the corresponding configuration
 256   variable, has been deprecated since 1.27 and was removed as well.
 257 * The HtmlFormatter class, deprecated in 1.27, was removed. The namespaced
 258   HtmlFormatter\HtmlFormatter class should be used instead.
 259 * The driver 'mysql' for MySQL, deprecated in MediaWiki 1.30, has been removed.
 260   The driver has been deprecated since PHP 5.5 and was removed in PHP 7.0. The
 261   default driver for MySQL has been 'mysqli' since MediaWiki 1.22.
 262 * The following properties of PreparedEdit were deprecated in 1.21 and have
 263   been removed:
 264   * PreparedEdit->newText
 265   * PreparedEdit->oldText
 266   * PreparedEdit->pst
 267 * ParserOutput objects which are generated using a non-default value for
 268   ParserOptions::setWrapOutputClass() can no longer be added to the parser
 269   cache.
 270 * The following deprecated methods from the OutputPage class have been removed:
 271   * OutputPage::addExtensionStyle(); deprecated in 1.27
 272   * OutputPage::getExtStyle(); deprecated in 1.27
 273   * OutputPage::setETag(); deprecated in 1.28 (obsolete no-op)
 274   * OutputPage::setSquidMaxage(); deprecated in 1.27
 275   * OutputPage::readOnlyPage(); deprecated in 1.25
 276   * OutputPage::rateLimited(); deprecated in 1.25
 277   * Additionally, the protected OutputPage::$mExtStyles array, only accessed
 278     through the above and with no known uses, was removed.
 279 * The no-op method Skin::showIPinHeader(), deprecated in 1.27, was removed.
 280 * The following variables and methods in EditPage, deprecated in MediaWiki 1.30,
 281   were removed:
 282   * $isCssJsSubpage — use ::isUserConfigPage()
 283   * $isCssSubpage — use ::isUserCssConfigPage()
 284   * $isJsSubpage — use ::isUserJsConfigPage()
 285   * $isWrongCaseCssJsPage – use ::isWrongCaseUserConfigPage()
 286   * ::getSummaryInput() – use ::getSummaryInputWidget()
 287   * ::getSummaryInputOOUI() – use ::getSummaryInputWidget()
 288   * ::getCheckboxes() – use ::getCheckboxesWidget() or
 289       ::getCheckboxesDefinition()
 290   * ::getCheckboxesOOUI() – use ::getCheckboxesWidget() or
 291       ::getCheckboxesDefinition()
 292 * ResourceLoaderModule::getPosition(), deprecated in 1.29, has been removed.
 293 * In User, the cookie-related methods which were wrappers for the functions on
 294   the response object, and were deprecated in 1.27, have been removed:
 295   * ::setCookie()
 296   * ::clearCookie()
 297   * ::setExtendedLoginCookie()
 298   Note that User::setCookies() remains, and is not deprecated.
 299 * Also in User, some auth-related methods which were deprecated in 1.27 have
 300   been removed:
 301   * ::getEditTokenTimestamp() – use MediaWiki\Session\Token::getTimestamp()
 302   * ::getPasswordFactory() – create a PasswordFactory directly
 303   * ::passwordChangeInputAttribs()
 304 * The global functions wfProfileIn and wfProfileOut, deprecated in 1.25, have
 305   been removed.
 306 * SpecialPageFactory::getList(), deprecated in 1.24, has been removed. You can
 307   use ::getNames() instead.
 308 * OpenSearch::getOpenSearchTemplate(), deprecated in 1.25, has been removed. You
 309   can use ApiOpenSearch::getOpenSearchTemplate() instead.
 310 * The global function wfBaseConvert, deprecated in 1.27, has been removed. Use
 311   Wikimedia\base_convert() directly.
 312 * Calling Database::begin() explicitly during an implicit transaction or when
 313   DBO_TRX is set results in an exception. Calling Database::commit() explicitly
 314   for an implicit transaction also results in an exception. Previously these
 315   were logged as errors. The startAtomic() and endAtomic() methods, or
 316   AtomicSectionUpdate should be used instead.
 317 * The global function wfOutputHandler() was removed, use the its replacement
 318   MediaWiki\OutputHandler::handle() instead. The global function was only
 319   sometimes defined. Its replacement is always available via the autoloader.
 320 * ChangeTags::listExtensionActivatedTags and ::listExtensionDefinedTags,
 321   deprecated in 1.28, have been removed. Use ::listSoftwareActivatedTags() and
 322   ::listSoftwareDefinedTags() instead.
 323 * Title::getTitleInvalidRegex(), deprecated in 1.25, has been removed. You can
 324   use MediaWikiTitleCodec::getTitleInvalidRegex() instead.
 325 * HTMLForm & VFormHTMLForm::isVForm(), deprecated in 1.25, have been removed.
 326 * The ProfileSection class, deprecated in 1.25 and unused, has been removed.
 327 * The ResourceLoaderGetLessVars hook, deprecated in 1.30, has been removed. Use
 328   ResourceLoaderModule::getLessVars() to expose local variables instead of
 329   global ones.
 330 * As part of work to modernise user-generated content clean-up, a config option
 331   and some methods related to HTML validity were removed without deprecation.
 332   The public methods MWTidy::checkErrors() and the path through which it was
 333   called, TidyDriverBase::validate(), are removed, as are the testing methods
 334   MediaWikiTestCase::assertValidHtmlSnippet() and ::assertValidHtmlDocument().
 335   The $wgValidateAllHtml configuration option is removed and will be ignored.
 336 * Execution of external programs using MediaWiki\Shell\Command now applies
 337   the RESTRICT_DEFAULT Firejail restriction by default.
 338 * The ResourceLoaderModule::getHashMtime() and ::getDefinitionMtime() methods,
 339   deprecated in 1.26, were removed.
 340 * The deprecated 'mediawiki.widgets.CategorySelector' module alias was removed.
 341   Use the 'mediawiki.widgets.CategoryMultiselectWidget' module directly.
 342
 343 === Deprecations in 1.31 ===
 344 * The Revision class was deprecated in favor of RevisionStore, BlobStore, and
 345   RevisionRecord and its subclasses.
 346 * The global function wfBCP47 is deprecated in favour of LanguageCode::bcp47.
 347 * The global function wfCountDown is now deprecated in favor of
 348   Maintenance::countDown.
 349 * Several methods for returning lists of fields to select from the database
 350   have been deprecated in favor of similar methods that also return the tables
 351   to select from and the join conditions for those tables.
 352   * Block::selectFields() → Block::getQueryInfo()
 353   * RecentChange::selectFields() → RecentChange::getQueryInfo()
 354   * ArchivedFile::selectFields() → ArchivedFile::getQueryInfo()
 355   * LocalFile::selectFields() → LocalFile::getQueryInfo()
 356   * LocalFile::getCacheFields() with a prefix no longer works
 357   * LocalFile::getLazyCacheFields() with a prefix no longer works
 358   * OldLocalFile::selectFields() → OldLocalFile::getQueryInfo()
 359   * RecentChange::selectFields() → RecentChange::getQueryInfo()
 360   * Revision::userJoinCond() → Revision::getQueryInfo( [ 'user' ] )
 361   * Revision::selectUserFields() → Revision::getQueryInfo( [ 'user' ] )
 362   * Revision::pageJoinCond() → Revision::getQueryInfo( [ 'page' ] )
 363   * Revision::selectPageFields() → Revision::getQueryInfo( [ 'page' ] )
 364   * Revision::selectTextFields() → Revision::getQueryInfo( [ 'text' ] )
 365   * Revision::selectFields() → Revision::getQueryInfo()
 366   * Revision::selectArchiveFields() → Revision::getArchiveQueryInfo()
 367   * User::selectFields() → User::getQueryInfo()
 368   * WikiPage::selectFields() → WikiPage::getQueryInfo()
 369 * Revision::setUserIdAndName() was deprecated.
 370 * Access to TitleValue class properties was deprecated, the relevant getters
 371   should be used instead.
 372 * DifferenceEngine::getDiffBodyCacheKey() is deprecated. Subclasses should
 373   override DifferenceEngine::getDiffBodyCacheKeyParams() instead.
 374 * Use of Maintenance::error( $err, $die ) to exit script was deprecated. Use
 375   Maintenance::fatalError() instead.
 376 * Passing a ParserOptions object to OutputPage::parserOptions() is deprecated.
 377 * The RevisionInsertComplete hook is now deprecated; use instead the hook
 378   RevisionRecordInserted. RevisionInsertComplete is still called, but the second
 379   and third parameter will always be null. Hard deprecation is scheduled for 1.32.
 380 * The following methods that get and set ParserOutput state are deprecated.
 381   Callers should use the new stateless $options parameter to
 382   ParserOutput::getText() instead.
 383   * ParserOptions::getEditSection()
 384   * ParserOptions::setEditSection()
 385   * ParserOutput::getEditSectionTokens()
 386   * ParserOutput::setEditSectionTokens()
 387   * ParserOutput::getTOCEnabled()
 388   * ParserOutput::setTOCEnabled()
 389   * OutputPage::enableSectionEditLinks()
 390   * OutputPage::sectionEditLinksEnabled()
 391   * The public ParserOutput state fields $mTOCEnabled and $mEditSectionTokens
 392     are also deprecated.
 393 * License::getLicenses has been deprecated; use License::getLines instead.
 394 * QuickTemplate::setRef() was deprecated in favour of QuickTemplate::set().
 395   Setting template variables by reference allowed violating the principle of
 396   data being immutable once added to the skin template. In practice, this method
 397   was not being used for that. Rather, setRef() existed as memory optimisation
 398   for PHP 4.
 399 * QuickTemplate::setTranslator() and MediaWikiI18N::set() were deprecated in
 400   favour of Skin::msg() parameters.
 401 * MediaWikiI18N::translate() was deprecated in favour of Skin::msg() or
 402   wfMessage().
 403 * Passing false to ParserOptions::setWrapOutputClass() is deprecated. Use the
 404   'unwrap' transform to ParserOutput::getText() instead.
 405 * \ObjectFactory (no namespace) is deprecated, the namespaced class
 406   \Wikimedia\ObjectFactory from the wikimedia/object-factory library should be
 407   used instead.
 408 * CommentStore::newKey is deprecated. Instead, get an instance from
 409   MediaWikiServices.
 410 * The following CommentStore methods have had their signatures changed to
 411   introduce a $key parameter, usage of the methods on instances retrieved from
 412   CommentStore::newKey will remain unchanged but deprecated:
 413   * CommentStore::getFields
 414   * CommentStore::getJoin
 415   * CommentStore::getComment
 416   * CommentStore::getCommentLegacy
 417   * CommentStore::insert
 418   * CommentStore::insertWithTemplate
 419 * The following methods in Title have been renamed, and the old ones are
 420   deprecated:
 421   * Title::getSkinFromCssJsSubpage – use ::getSkinFromConfigSubpage
 422   * Title::isCssOrJsPage – use ::isSiteConfigPage
 423   * Title::isCssJsSubpage – use ::isUserConfigPage
 424   * Title::isCssSubpage – use ::isUserCssConfigPage
 425   * Title::isJsSubpage – use ::isUserJsConfigPage
 426 * The following methods related to caching of half-parsed HTML were deprecated:
 427   * Parser::serializeHalfParsedText()
 428   * Parser::unserializeHalfParsedText()
 429   * Parser::isValidHalfParsedText()
 430   * StripState::getSubState()
 431   * StripState::merge()
 432 * The DeferredStringifier class is deprecated, use Message::listParam() instead.
 433 * The type string for the parameter $lang of DateFormatter::getInstance is
 434   deprecated.
 435 * Wikimedia\Rdbms\SavepointPostgres is deprecated.
 436 * The DO_MAINTENANCE constant is deprecated. RUN_MAINTENANCE_IF_MAIN should be
 437   used instead.
 438 * The function wfShellWikiCmd() has been deprecated, use
 439   MediaWiki\Shell::makeScriptCommand().
 440 * In the future, the hooks 'PreferencesFormPreSave' and 'PreferencesGetLegend'
 441   will be allowed to provide any HTMLForm object rather than PreferencesForm.
 442
 443 === Other changes in 1.31 ===
 444 * Browser support for Internet Explorer 10 was lowered from Grade A to Grade C.
 445 * Browser support for Opera 12 and older was dropped entirely. Opera 15+
 446   continues at Grade A.
 447 * Multi-content-revision capability was introduced into the storage layer. See
 448   <https://mediawiki.org/wiki/Requests_for_comment/Multi-Content_Revisions>.
 449 * The "free" CSS class is now only applied to unbracketed URLs in wikitext.
 450   Links written using square brackets will get the class "text" not "free".
 451 * RFC 157418: Whitespace is trimmed from wikitext headings, wikitext list items,
 452   wikitext table captions, wikitext table headings, wikitext table cells. HTML
 453   headings, HTML list items, HTML table captions, HTML table headings, HTML
 454   table cells will not have this trimming behavior.
 455
 456 == Compatibility ==
 457 MediaWiki 1.31 requires PHP 7.0.0 or later. Although HHVM 3.18.5 or later is
 458 supported, it is generally advised to use PHP 7.0.0 or later for long term
 459 support.
 460
 461 MySQL/MariaDB is the recommended DBMS. PostgreSQL or SQLite can also be used,
 462 but support for them is somewhat less mature. There is experimental support for
 463 Oracle and Microsoft SQL Server.
 464
 465 The supported versions are:
 466
 467 * MySQL 5.5.8 or later
 468 * PostgreSQL 9.2 or later
 469 * SQLite 3.3.7 or later
 470 * Oracle 9.0.1 or later
 471 * Microsoft SQL Server 2005 (9.00.1399)
 472
 473 == Upgrading ==
 474 1.31 has several database changes since 1.30, and will not work without schema
 475 updates. Note that due to changes to some very large tables like the revision
 476 table, the schema update may take quite long (minutes on a medium sized site,
 477 many hours on a large site).
 478
 479 Don't forget to always back up your database before upgrading!
 480
 481 See the file UPGRADE for more detailed upgrade instructions, including
 482 important information when upgrading from versions prior to 1.11.
 483
 484 For notes on 1.30.x and older releases, see HISTORY.
 485
 486 == Online documentation ==
 487 Documentation for both end-users and site administrators is available on
 488 MediaWiki.org, and is covered under the GNU Free Documentation License (except
 489 for pages that explicitly state that their contents are in the public domain):
 490
 491        https://www.mediawiki.org/wiki/Special:MyLanguage/Documentation
 492
 493 == Mailing list ==
 494 A mailing list is available for MediaWiki user support and discussion:
 495
 496        https://lists.wikimedia.org/mailman/listinfo/mediawiki-l
 497
 498 A low-traffic announcements-only list is also available:
 499
 500        https://lists.wikimedia.org/mailman/listinfo/mediawiki-announce
 501
 502 It's highly recommended that you sign up for one of these lists if you're
 503 going to run a public MediaWiki, so you can be notified of security fixes.
 504
 505 == IRC help ==
 506 There's usually someone online in #mediawiki on irc.freenode.net.