RELEASE-NOTES-1.31

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