RELEASE-NOTES-1.25

   1 Security reminder: If you have PHP's register_globals option set, you must
   2 turn it off. MediaWiki will not work with it enabled.
   3
   4 == MediaWiki 1.25 ==
   5
   6 THIS IS NOT A RELEASE YET
   7
   8 MediaWiki 1.25 is an alpha-quality branch and is not recommended for use in
   9 production.
  10
  11 === Configuration changes in 1.25 ===
  12 * $wgPageShowWatchingUsers was removed.
  13 * $wgLocalVirtualHosts has been added to replace $wgConf->localVHosts.
  14 * $wgAntiLockFlags was removed.
  15 * $wgJavaScriptTestConfig was removed.
  16 * Edit tokens returned from User::getEditToken may change on every call. Token
  17   validity must be checked by passing the user-supplied token to
  18   User::matchEditToken rather than by testing for equality with a
  19   newly-generated token.
  20 * (T74951) The UserGetLanguageObject hook may be passed any IContextSource
  21   for its $context parameter. Formerly it was documented as receiving a
  22   RequestContext specifically.
  23 * Profiling was restructured and $wgProfiler now requires an 'output' parameter.
  24   See StartProfiler.sample for details.
  25 * $wgMangleFlashPolicy was added to make MediaWiki's mangling of anything that
  26   might be a flash policy directive configurable.
  27 * ApiOpenSearch now supports XML output. The OpenSearchXml extension should no
  28   longer be used. If extracts and page images are desired, the TextExtracts and
  29   PageImages extensions are required.
  30 * $wgOpenSearchTemplate is deprecated in favor of $wgOpenSearchTemplates.
  31 * Edits are now prepared via AJAX as users type edit summaries. This behavior
  32   can be disabled via $wgAjaxEditStash.
  33 * (T46740) The temporary option $wgIncludejQueryMigrate was removed, along
  34   with the jQuery Migrate library, as indicated when this option was provided in
  35   MediaWiki 1.24.
  36 * ProfilerStandard and ProfilerSimpleTrace were removed. Make sure that any
  37   StartProfiler.php config is updated to reflect this. Xhprof is available
  38   for zend/hhvm. Also, for hhvm, one can consider using its xenon profiler.
  39 * Default value of $wgSVGConverters['rsvg'] now uses the 'rsvg-convert' binary
  40   rather than 'rsvg'.
  41 * Default value of $wgSVGConverters['ImageMagick'] now uses transparent
  42   background with white fallback color, rather than just white background.
  43  * MediaWikiBagOStuff class removed, make sure any object cache config
  44    uses SqlBagOStuff instead.
  45 * The 'daemonized' flag must be set to true in $wgJobTypeConf for any redis
  46   job queues. This means that mediawiki/services/jobrunner service has to
  47   be installed and running for any such queues to work.
  48
  49 === New features in 1.25 ===
  50 * (T64861) Updated plural rules to CLDR 26. Includes incompatible changes
  51   for plural forms in Russian, Prussian, Tagalog, Manx and several languages
  52   that fall back to Russian.
  53 * (T60139) ResourceLoaderFileModule now supports language fallback
  54   for 'languageScripts'.
  55 * Added a new hook, "ContentAlterParserOutput", to allow extensions to modify the
  56   parser output for a content object before links update.
  57 * (T37785) Enhanced recent changes and extended watchlist are now default.
  58   Documentation: https://meta.wikimedia.org/wiki/Help:Enhanced_recent_changes
  59   and https://www.mediawiki.org/wiki/Manual:$wgDefaultUserOptions.
  60 * (T69341) SVG images will no longer be base64-encoded when being embedded
  61   in CSS. This results in slight size increase before gzip compression (due to
  62   percent-encoding), but up to 20% decrease after it.
  63 * Update jStorage to v0.4.12.
  64 * MediaWiki now natively supports page status indicators: icons (or short text
  65   snippets) usually displayed in the top-right corner of the page. They have
  66   been in use on Wikipedia for a long time, implemented using templates and CSS
  67   absolute positioning.
  68   - Basic wikitext syntax: <indicator name="foo">[[File:Foo.svg|20px]]</indicator>
  69   - Usage instructions: https://www.mediawiki.org/wiki/Help:Page_status_indicators
  70   - Adjusting custom skins to support indicators:
  71     https://www.mediawiki.org/wiki/Manual:Skinning#Page_status_indicators
  72 * Edit tokens may now be time-limited: passing a maximum age to
  73   User::matchEditToken will reject any older tokens.
  74 * The debug logging internals have been overhauled, and are now using the
  75   PSR-3 interfaces.
  76 * Update CSSJanus to v1.1.1.
  77 * Update lessphp to v0.5.0.
  78 * Added a hook, "ApiOpenSearchSuggest", to allow extensions to provide extracts
  79   and images for ApiOpenSearch output. The semantics are identical to the
  80   "OpenSearchXml" hook provided by the OpenSearchXml extension.
  81 * PrefixSearchBackend hook now has an $offset parameter. Combined with $limit,
  82   this allows for pagination of prefix results. Extensions using this hook
  83   should implement supporting behavior. Not doing so can result in undefined
  84   behavior from API clients trying to continue through prefix results.
  85 * Update jQuery from v1.11.1 to v1.11.2.
  86 * External libraries installed via composer will now be displayed
  87   on Special:Version in their own section. Extensions or skins that are
  88   installed via composer will not be shown in this section as it is assumed
  89   they will add the proper credits to the skins or extensions section. They
  90   can also be accessed through the API via the new siprop=libraries to
  91   ApiQuerySiteInfo.
  92 * Update QUnit from v1.14.0 to v1.16.0.
  93 * Update Moment.js from v2.8.3 to v2.8.4.
  94 * Special:Tags now allows for manipulating the list of user-modifiable change
  95   tags. Actually modifying the tagging of a revision or log entry is not
  96   implemented yet.
  97 * Added 'managetags' user right and 'ChangeTagCanCreate', 'ChangeTagCanDelete',
  98   and 'ChangeTagCanCreate' hooks to allow for managing user-modifiable change
  99   tags.
 100 * Added 'ChangeTagsListActive' hook, to separate the concepts of "defined" and
 101   "active" formerly conflated by the 'ListDefinedTags' hook.
 102 * Added TemplateParser class that provides a server-side interface to cachable
 103   dynamically-compiled Mustache templates (currently uses lightncandy library).
 104 * Clickable anchors for each section heading in the content are now generated
 105   and appear in the gutter on hovering over the heading.
 106 * Added 'CategoryViewer::doCategoryQuery' and 'CategoryViewer::generateLink' hooks
 107   to allow extensions to override how links to pages are rendered within NS_CATEGORY
 108 * (T19665) Special:WantedPages only lists page which having at least one red link
 109   pointing to it.
 110 * New hooks 'ApiMain::moduleManager' and 'ApiQuery::moduleManager', can be
 111   used for conditional registration of API modules.
 112 * New hook 'EnhancedChangesList::getLogText' to alter, remove or add to the
 113   links of a group of changes in EnhancedChangesList.
 114 * A full interface for StatsD metric reporting has been added to the context
 115   interface, reachable via IContextSource::getStats().
 116 * Move the jQuery Client library from being mastered in MediaWiki as v0.1.0 to a
 117   proper, published library, which is now tagged as v1.0.0.
 118 * A new message (defaulting to blank), 'editnotice-notext', can be shown to users
 119   when they are editing if no edit notices apply to the page being edited.
 120
 121 ==== External libraries ====
 122 * MediaWiki now requires certain external libraries to be installed. In the past
 123   these were bundled inside the Git repository of MediaWiki core, but now they
 124   need to be installed separately. For users using the tarball, this will be taken
 125   care of and no action will be required. Users using Git will either need to use
 126   composer to fetch dependencies or use the mediawiki/vendor repository which includes
 127   all dependencies for MediaWiki core and ones used in Wikimedia deployment. Detailed
 128   instructions can be found at:
 129   https://www.mediawiki.org/wiki/Download_from_Git#Fetch_external_libraries
 130 * The following libraries are now required:
 131 ** psr/log
 132    This library provides the interfaces set by the PSR-3 standard (http://www.php-fig.org/psr/psr-3/)
 133    which are used by MediaWiki internally via the MWLoggerFactory class.
 134    See the structured logging RfC (https://www.mediawiki.org/wiki/Requests_for_comment/Structured_logging)
 135    for more background information.
 136 ** cssjanus/cssjanus
 137    This library was formerly bundled with MediaWiki core and has been removed.
 138    It automatically flips CSS for RTL support.
 139 ** leafo/lessphp
 140    This library was formerly bundled with MediaWiki core and has been removed.
 141    It compiles LESS files into CSS.
 142 ** wikimedia/cdb
 143    This library was formerly a part of MediaWiki core, and has been moved into a separate library.
 144    It provides CDB functions which are used in the Interwiki and Localization caches.
 145    More information about the library can be found at https://www.mediawiki.org/wiki/CDB.
 146 ** liuggio/statsd-php-client
 147    This library provides a StatsD client API for logging application metrics to a remote server.
 148
 149 === Bug fixes in 1.25 ===
 150 * (T73003) No additional code will be generated to try to load CSS-embedded
 151   SVG images in Internet Explorer 6 and 7, as they don't support them anyway.
 152 * (T69021) On Special:BookSources, corrected validation of ISBNs (both
 153   10- and 13-digit forms) containing "X".
 154 * Page moving was refactored into a MovePage class. As part of that:
 155 ** The AbortMove hook was removed.
 156 ** MovePageIsValidMove is for extensions to specify whether a page
 157    cannot be moved for technical reasons, and should not be overridden.
 158 ** MovePageCheckPermissions is for checking whether the given user is
 159    allowed to make the move.
 160 ** Title::moveNoAuth() was deprecated. Use the MovePage class instead.
 161 ** Title::moveTo() was deprecated. Use the MovePage class instead.
 162 ** Title::isValidMoveOperation() broken down into MovePage::isValidMove()
 163    and MovePage::checkPermissions().
 164 * (T18530) Multiple autocomments are now formatted in an edit summary.
 165 * (T70361) Autocomments containing "/*" are parsed correctly.
 166 * The Special:WhatLinksHere page linked from 'Number of redirects to this page'
 167   on action=info about a file page does not list file links anymore.
 168 * (T78637) Search bar is not autofocused unless it is empty so that proper scrolling using arrow keys is possible.
 169 * (T50853) Database::makeList() modified to handle 'NULL' separately when building IN clause
 170 * (T85192) Captcha position modified in Usercreate template. As a result:
 171 ** extrafields parameter added to Usercreate.php to insert additional data
 172 ** 'extend' method added to QuickTemplate to append additional values to any field of data array
 173 * (T86974) Several Title methods now load from the database when necessary
 174   (instead of returning incorrect results) even when the page ID is known.
 175 * (T74070) Duplicate search for archived files on file upload now omits the extension.
 176   This requires the fa_sha1 field being populated.
 177 * Removed rel="archives" from the "View history" link, as it did not pass
 178   HTML validation.
 179 * $wgUseTidy is now set when parserTests are run with the tidy option to match
 180   output on wiki.
 181
 182 === Action API changes in 1.25 ===
 183 * (T67403) XML tag highlighting is now only performed for formats
 184   "xmlfm" and "wddxfm".
 185 * action=paraminfo supports generalized submodules (modules=query+value),
 186   querymodules and formatmodules are deprecated
 187 * action=paraminfo no longer outputs descriptions and other help text by
 188   default. If needed, it may be requested using the new 'helpformat' parameter.
 189 * action=help has been completely rewritten, and outputs help in HTML
 190   rather than plain text.
 191 * Hitting api.php without specifying an action now displays only the help for
 192   the main module, with links to submodule help.
 193 * API help is no longer displayed on errors.
 194 * 'uselang' is now a recognized API parameter; "uselang=user" may be used to
 195   explicitly select the language from the current user's preferences, and
 196   "uselang=content" may be used to select the wiki's content language.
 197 * Default output format for the API is now jsonfm.
 198 * Simplified continuation will return a "batchcomplete" property in the result
 199   when a batch of pages is complete.
 200 * Pretty-printed HTML output now has nicer formatting and (if available)
 201   better syntax highlighting.
 202 * Deprecated list=deletedrevs in favor of newly-added prop=deletedrevisions and
 203   list=alldeletedrevisions.
 204 * prop=revisions will gracefully continue when given too many revids or titles,
 205   rather than just ignoring the extras.
 206 * prop=revisions will no longer die if rvcontentformat doesn't match a
 207   revision's content model; it will instead warn and omit the content.
 208 * If the user has the 'deletedhistory' right, action=query's revids parameter
 209   will now recognize deleted revids.
 210 * prop=revisions may be used as a generator, generating revids.
 211 * (T68776) format=json results will no longer be corrupted when
 212   $wgMangleFlashPolicy is in effect. format=php results will cleanly return an
 213   error instead of returning invalid serialized data.
 214 * Generators may now return data for the generated pages when used with
 215   action=query.
 216 * Query page data for generator=search and generator=prefixsearch will now
 217   include an "index" field, which may be used by the client for sorting the
 218   search results.
 219 * ApiOpenSearch now supports XML output.
 220 * ApiOpenSearch will now output descriptions and URLs as array indexes 2 and 3
 221   in JSON format.
 222 * (T76051) list=tags will now continue correctly.
 223 * (T76052) list=tags can now indicate whether a tag is defined.
 224 * (T75522) list=prefixsearch now supports continuation
 225 * (T78737) action=expandtemplates can now return page properties.
 226 * (T78690) list=allimages now accepts multiple pipe-separated values
 227   for the 'aimime' parameter.
 228 * prop=info with inprop=protections will now return applicable protection types
 229   with the 'restrictiontypes' key.
 230 * (T85417) When resolving redirects, ApiPageSet will now add the targets of
 231   interwiki redirects to the list of interwiki titles.
 232 * (T85417) When outputting the list of redirect titles, a 'tointerwiki'
 233   property (like the existing 'tofragment' property) will be set.
 234 * Added action=managetags to allow for managing the list of
 235   user-modifiable change tags. Actually modifying the tagging of a revision or
 236   log entry is not implemented yet.
 237 * list=tags has additional properties to indicate 'active' status and tag
 238   sources.
 239 * siprop=libraries was added to ApiQuerySiteInfo to list installed external libraries.
 240 * (T88010) Added action=checktoken, to test a CSRF token's validity.
 241 * (T88010) Added intestactions to prop=info, to allow querying of
 242   Title::userCan() via the API.
 243 * Default type param for query list=watchlist and list=recentchanges has
 244   been changed from all types (e.g. including 'external') to 'edit|new|log'.
 245
 246 === Action API internal changes in 1.25 ===
 247 * ApiHelp has been rewritten to support i18n and paginated HTML output.
 248   Most existing modules should continue working without changes, but should do
 249   the following:
 250   * Add an i18n message "apihelp-{$moduleName}-description" to replace getDescription().
 251   * Add i18n messages "apihelp-{$moduleName}-param-{$param}" for each parameter
 252     to replace getParamDescription(). If necessary, the settings array returned
 253     by getParams() can use the new ApiBase::PARAM_HELP_MSG key to override the
 254     message.
 255   * Implement getExamplesMessages() to replace getExamples().
 256 * Modules with submodules (like action=query) must have their submodules
 257   override ApiBase::getParent() to return the correct parent object.
 258 * The 'APIGetDescription' and 'APIGetParamDescription' hooks are deprecated,
 259   and will have no effect for modules using i18n messages. Use
 260   'APIGetDescriptionMessages' and 'APIGetParamDescriptionMessages' instead.
 261 * Api formatters will no longer be asked to display the help screen on errors.
 262 * ApiMain::getCredits() was removed. The credits are available in the
 263   'api-credits' i18n message.
 264 * ApiFormatBase has been changed to support i18n and syntax highlighting via
 265   extensions with the new 'ApiFormatHighlight' hook. Core syntax highlighting
 266   has been removed.
 267 * ApiFormatBase now always buffers. Output is done when
 268   ApiFormatBase::closePrinter is called.
 269 * Much of the logic in ApiQueryRevisions has been split into ApiQueryRevisionsBase.
 270 * The 'revids' parameter supplied by ApiPageSet will now count deleted
 271   revisions as "good" if the user has the 'deletedhistory' right. New methods
 272   ApiPageSet::getLiveRevisionIDs() and ApiPageSet::getDeletedRevisionIDs() are
 273   provided to access just the live or just the deleted revids.
 274 * Added ApiPageSet::setGeneratorData() and ApiPageSet::populateGeneratorData()
 275   to allow generators to include data in the action=query result.
 276 * New hooks 'ApiMain::moduleManager' and 'ApiQuery::moduleManager', can be
 277   used for conditional registration of API modules.
 278 * Added ApiBase::lacksSameOriginSecurity() to allow modules to easily check if
 279   the current request was sent with the 'callback' parameter (or any future
 280   method that breaks the same-origin policy).
 281 * Profiling methods in ApiBase are deprecated and no longer need to be called.
 282 * The following methods have been deprecated and may be removed in a future
 283   release:
 284   * ApiBase::getDescription
 285   * ApiBase::getParamDescription
 286   * ApiBase::getExamples
 287   * ApiBase::makeHelpMsg
 288   * ApiBase::makeHelpArrayToString
 289   * ApiBase::makeHelpMsgParameters
 290   * ApiBase::getModuleProfileName
 291   * ApiBase::profileIn
 292   * ApiBase::profileOut
 293   * ApiBase::safeProfileOut
 294   * ApiBase::getProfileTime
 295   * ApiBase::profileDBIn
 296   * ApiBase::profileDBOut
 297   * ApiBase::getProfileDBTime
 298   * ApiFormatBase::setUnescapeAmps
 299   * ApiFormatBase::getWantsHelp
 300   * ApiFormatBase::setHelp
 301   * ApiFormatBase::formatHTML
 302   * ApiFormatBase::setBufferResult
 303   * ApiFormatBase::getDescription
 304   * ApiMain::setHelp
 305   * ApiMain::reallyMakeHelpMsg
 306   * ApiMain::makeHelpMsgHeader
 307   * ApiQueryImageInfo::getPropertyDescriptions
 308 * The following classes have been deprecated and may be removed in a future
 309   release:
 310   * ApiQueryDeletedrevs
 311
 312 === Languages updated in 1.25 ===
 313
 314 MediaWiki supports over 350 languages. Many localisations are updated
 315 regularly. Below only new and removed languages are listed, as well as
 316 changes to languages because of Bugzilla reports.
 317
 318 * (T66440) Kazakh (kk) wikis should no longer forcefully reset the user's
 319   interface language to kk where unexpected.
 320 * The Chinese conversion table was substantially updated to fix a lot of
 321   bugs and ensure better reading experience for different variants.
 322
 323 === Other changes in 1.25 ===
 324 * The skin autodiscovery mechanism, deprecated in MediaWiki 1.23, has been
 325   removed. See https://www.mediawiki.org/wiki/Manual:Skin_autodiscovery for
 326   migration guide for creators and users of custom skins that relied on it.
 327 * Javascript variables 'wgFileCanRotate' and 'wgFileExtensions' now only
 328   available on Special:Upload.
 329 * (T58257) Set site logo from mediawiki.skinning.interface module instead of
 330   inline styles in the HTML.
 331 * Removed ApiQueryUsers::getAutoGroups(). (deprecated since 1.20)
 332 * Removed XmlDumpWriter::schemaVersion(). (deprecated since 1.20)
 333 * Removed LogEventsList::getDisplayTitle(). (deprecated since 1.20)
 334 * Removed Preferences::trySetUserEmail(). (deprecated since 1.20)
 335 * Removed mw.user.name() and mw.user.anonymous() methods. (deprecated since 1.20)
 336 * Removed 'ok' and 'err' parameters in the mediawiki.api modules. (deprecated
 337   since 1.20)
 338 * Removed 'async' parameter from the  mw.Api#getCategories() method. (deprecated
 339   since 1.20)
 340 * Removed 'jquery.json' module. (deprecated since 1.24)
 341   Use the 'json' module and global JSON object instead.
 342 * Deprecated OutputPage::readOnlyPage() and OutputPage::rateLimited().
 343   Also, the former will now throw an MWException if called with one or more
 344   arguments.
 345 * Removed hitcounters and associated code.
 346 * The "temp" zone of the upload respository is now considered private. If it
 347   already exists (such as under the images/ directory), please make sure that
 348   the directory is not web readable (e.g. via a .htaccess file).
 349 * BREAKING CHANGE: In the XML dump format used by Special:Export and
 350   dumpBackup.php, the <model> and <format> tags now apprear before the <text>
 351   tag, instead of after the <text> and <sha1> tags.
 352   The new schema version is 0.10, the new schema URI is:
 353   https://www.mediawiki.org/xml/export-0.10.xsd
 354 * MWFunction::call() and MWFunction::callArray() were removed, having being
 355   deprecated in 1.22.
 356 * Deprecated the getInternalLinkAttributes, getInternalLinkAttributesObj,
 357   and getInternalLinkAttributes methods in Linker, and removed
 358   getExternalLinkAttributes method, which was deprecated in MediaWiki 1.18.
 359 * Removed Sites class, which was deprecated in 1.21 and replaced by SiteSQLStore.
 360 * The mw.api.getToken() method now uses action=query?meta=tokens. This will now
 361   fail for custom tokens registered only via the deprecated ApiTokensGetTokenTypes
 362   hook. The ApiQueryTokensRegisterTypes hook should be used for this to work.
 363 * Added wgRelevantArticleId to the client-side config, for use on special pages.
 364 * Deprecated the TitleIsCssOrJsPage hook. Superseded by the
 365   ContentHandlerDefaultModelFor hook since MediaWiki 1.21.
 366 * Deprecated the TitleIsWikitextPage hook. Superseded by the
 367   ContentHandlerDefaultModelFor hook since MediaWiki 1.21.
 368 * Changed parsing of variables in schema (.sql) files:
 369 ** The substituted values are no longer parsed. (Formerly, several passes
 370    were made for each variable, so depending on the order in which variables
 371    were defined, variables might have been found inside encoded values. This
 372    is no longer the case.)
 373 ** Variables are no longer string encoded when the /*$var*/ syntax is used.
 374    If string encoding is necessary, use the '{$var}' syntax instead.
 375 ** Variable names must only consist of one or more of the characters
 376    "A-Za-z0-9_".
 377 ** In source text of the form '{$A}'{$B}' or `{$A}`{$B}`, where variable A
 378    does not exist yet variable B does, the latter may not be replaced.
 379    However, this difference is unlikely to arise in practice.
 380 * (T67278) RFC, PMID, and ISBN "magic links" must be surrounded by non-word
 381   characters on both sides.
 382 * The FormatAutocomments hook will now receive $pre and $post as booleans,
 383   rather than as strings that must be prepended or appended to $comment.
 384 * (T30950, T31025) RFC, PMID, and ISBN "magic links" can no longer contain
 385   newlines; but they can contain &nbsp; and other non-newline whitespace.
 386 * The 'mediawiki.action.edit' ResourceLoader module no longer generates the edit
 387   toolbar, which has been moved to a separate 'mediawiki.toolbar' module. If you
 388   relied on this behavior, update your scripts' dependencies.
 389 * HTMLForm's 'vform' display style has been separated to a subclass. Therefore:
 390   * HTMLForm::isVForm() is now deprecated.
 391   * You can no longer do this:
 392       $form = new HTMLForm( … );
 393       $form->setDisplayFormat( 'vform' ); // throws exception
 394     Instead, do this:
 395       $form = HTMLForm::factory( 'vform', … );
 396 * Deprecated Revision methods getRawUser(), getRawUserText() and getRawComment().
 397 * BREAKING CHANGE: mediawiki.user.generateRandomSessionId:
 398   The alphabet of the prior string returned was A-Za-z0-9 and now it is 0-9A-F
 399 * (T87504) Avoid serving SVG background-images in CSS for Opera 12, which
 400   renders them incorrectly when combined with border-radius or background-size.
 401 * Removed maintenance script dumpSisterSites.php.
 402 * DatabaseBase class constructors must be called using the array argument style.
 403   Ideally, DatabaseBase:factory() should be used instead in most cases.
 404 * Deprecated ParserOutput::addSecondaryDataUpdate and ParserOutput::getSecondaryDataUpdates.
 405   This is a hard deprecation, with getSecondaryDataUpdates returning an empty array and
 406   addSecondaryDataUpdate throwing an exception. These functions will be removed in 1.26,
 407   since they interfere with caching of ParserOutput objects.
 408 * Introduced new hook 'SecondaryDataUpdates' that allows extensions to inject custom updates.
 409 * EditPage::attemptSave has been modified not to call handleStatus itself and
 410   instead just returns the Status object. Extension calling it should be aware of
 411   this.
 412 * Removed class DBObject. (unused since 1.10)
 413 * wfDiff() is deprecated.
 414
 415 == Compatibility ==
 416
 417 MediaWiki 1.25 requires PHP 5.3.3 or later. There is experimental support for
 418 HHVM 3.3.0.
 419
 420 MySQL is the recommended DBMS. PostgreSQL or SQLite can also be used, but
 421 support for them is somewhat less mature. There is experimental support for
 422 Oracle and Microsoft SQL Server.
 423
 424 The supported versions are:
 425
 426 * MySQL 5.0.3 or later
 427 * PostgreSQL 8.3 or later
 428 * SQLite 3.3.7 or later
 429 * Oracle 9.0.1 or later
 430 * Microsoft SQL Server 2005 (9.00.1399)
 431
 432 == Upgrading ==
 433
 434 1.25 has several database changes since 1.24, and will not work without schema
 435 updates. Note that due to changes to some very large tables like the revision
 436 table, the schema update may take quite long (minutes on a medium sized site,
 437 many hours on a large site).
 438
 439 If upgrading from before 1.11, and you are using a wiki as a commons
 440 repository, make sure that it is updated as well. Otherwise, errors may arise
 441 due to database schema changes.
 442
 443 If upgrading from before 1.7, you may want to run refreshLinks.php to ensure
 444 new database fields are filled with data.
 445
 446 If you are upgrading from MediaWiki 1.4.x or earlier, you should upgrade to
 447 1.5 first. The upgrade script maintenance/upgrade1_5.php has been removed
 448 with MediaWiki 1.21.
 449
 450 Don't forget to always back up your database before upgrading!
 451
 452 See the file UPGRADE for more detailed upgrade instructions.
 453
 454 For notes on 1.24.x and older releases, see HISTORY.
 455
 456 == Online documentation ==
 457
 458 Documentation for both end-users and site administrators is available on
 459 MediaWiki.org, and is covered under the GNU Free Documentation License (except
 460 for pages that explicitly state that their contents are in the public domain):
 461
 462         https://www.mediawiki.org/wiki/Documentation
 463
 464 == Mailing list ==
 465
 466 A mailing list is available for MediaWiki user support and discussion:
 467
 468         https://lists.wikimedia.org/mailman/listinfo/mediawiki-l
 469
 470 A low-traffic announcements-only list is also available:
 471
 472         https://lists.wikimedia.org/mailman/listinfo/mediawiki-announce
 473
 474 It's highly recommended that you sign up for one of these lists if you're
 475 going to run a public MediaWiki, so you can be notified of security fixes.
 476
 477 == IRC help ==
 478
 479 There's usually someone online in #mediawiki on irc.freenode.net.