RELEASE-NOTES-1.31

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