3 THIS IS NOT A RELEASE YET
5 MediaWiki 1.27 is an alpha-quality branch and is not recommended for use in
8 === PHP version requirement ===
9 As of 1.27, MediaWiki now requires PHP 5.5.9 or higher. This corresponds with
10 HHVM 3.1. Additionally, the following PHP extensions are required:
16 The following PHP extensions are strongly recommended:
19 === Configuration changes in 1.27 ===
20 * $wgAllowMicrodataAttributes and $wgAllowRdfaAttributes were removed,
21 now always enabled. If you use RDFa on your wiki, you now have to explicitly
22 set $wgHtml5Version to 'HTML+RDFa 1.0' or 'XHTML+RDFa 1.0'.
23 * $wgUseLinkNamespaceDBFields was removed.
24 * Deprecated $wgResourceLoaderMinifierStatementsOnOwnLine and
25 $wgResourceLoaderMinifierMaxLineLength, because there was little value in
26 making the behavior configurable. The default values (`false` for the former,
27 1000 for the latter) are now hard-coded.
28 * $wgDebugDumpSqlLength was removed (deprecated in 1.24).
29 * $wgDebugDBTransactions was removed (deprecated in 1.20).
30 * $wgUseXVO has been removed, as it provides functionality only used by
31 custom Wikimedia patches against Squid 2.x that probably noone uses in
32 production anymore. There is now $wgUseKeyHeader that provides similar
33 functionality but instead of the MediaWiki-specific X-Vary-Options header,
34 uses the draft Key header standard.
35 * $wgScriptExtension (and support for '.php5' entry points) was removed. See the
36 deprecation notice in the release notes for version 1.25 for advice on how to
37 preserve support for '.php5' entry points via URL rewriting.
38 * Password handling via the User object has been deprecated and partially
39 removed, pending the future introduction of AuthManager. In particular:
40 ** expirePassword(), getPasswordExpireDate(), resetPasswordExpiration(), and
41 getPasswordExpired() have been removed. They were unused outside of core.
42 ** The mPassword, mNewpassword, mNewpassTime, and mPasswordExpires fields are
43 now private and will be removed in the future.
44 ** The getPassword() and getTemporaryPassword() methods now throw
45 BadMethodCallException and will be removed in the future.
46 ** The ability to pass 'password' and 'newpassword' to createNew() has been
47 removed. The only users of it seem to have been using it to set invalid
48 passwords, and so shouldn't be greatly affected.
49 ** setPassword(), setInternalPassword(), and setNewpassword() have been
50 deprecated, pending the introduction of AuthManager.
51 ** User::randomPassword() is deprecated in favor of a new method
52 PasswordFactory::generateRandomPasswordString()
53 ** User::getPasswordFactory() is deprecated, callers should just create a
54 PasswordFactory themselves.
55 ** A new constructor, User::newSystemUser(), has been added to simplify the
56 creation of passwordless "system" users for logged actions.
57 * $wgMaxSquidPurgeTitles was removed.
58 * $wgAjaxWatch was removed. This is now enabled by default.
59 * $wgUseInstantCommons now hotlinks Commons images by default instead of
60 downloading originals and thumbnailing them locally. This allows wikis to save
61 on CPU and bandwidth while reducing time to first byte for pages, even without
62 a thumbnail handler. See $wgForeignFileRepos documentation for tweaks.
63 * (T27397) WebP is enabled by default as an uploadable filetype.
64 * (T48998) $wgArticlePath must now be either a full url, or start with a "/".
65 * $wgRateLimitLog was removed; use $wgDebugLogGroups['ratelimit'] instead.
66 * Deprecated API formats dbg, txt, and yaml have been removed.
67 * CLDRPluralRule* classes have been replaced with
68 wikimedia/cldr-plural-rule-parser.
69 * Removed $wgProfilePerHost, $wgUDPProfilerHost, $wgUDPProfilerPort,
70 $wgUDPProfilerFormatString, $wgStatsMethod, $wgAggregateStatsID,
71 $wgStatsFormatString, and $wgProfileCallTree (deprecated since 1.20).
72 * For proper operation of LocalIdLookup with shared user tables, ensure that
73 $wgSharedDB and $wgSharedTables are properly set even on the "central" wiki
74 that all others are sharing from and that $wgLocalDatabases is set to the
75 full list of sharing wikis on all those wikis.
76 * Massive overhaul to session handling:
77 ** $wgSessionsInObjectCache is no longer supported and must be true, due to
78 MediaWiki\Session\SessionManager. $wgSessionHandler is similarly no longer
80 ** ObjectCacheSessionHandler is removed, replaced with
81 MediaWiki\Session\PhpSessionHandler.
82 ** PHP session handling in general ($_SESSION, session_id(), and so on) is
83 deprecated. Use MediaWiki\Session\SessionManager instead. A new config
84 variable, $wgPHPSessionHandling, is available to cause use of $_SESSION to
85 issue a deprecation warning or to cause most PHP session handling to throw
87 ** Deprecated UserSetCookies hook. Session-handling extensions should generally
88 be creating a custom subclass of CookieSessionProvider. Other extensions
89 messing with cookies can no longer count on user data being saved in cookies
91 ** Deprecated UserLoadFromSession hook, extensions should create a
92 MediaWiki\Session\SessionProvider.
93 ** The User cannot be loaded from session until after Setup.php completes.
94 Attempts to do so will be ignored and the User will remain unloaded.
95 ** CSRF tokens may be fetched from the MediaWiki\Session\Session, which uses
96 the MediaWiki\Session\Token class.
97 * MediaWiki will now auto-create users as necessary, removing the need for
98 extensions to do so. An 'autocreateaccount' right is added to allow
99 auto-creation when 'createaccount' is not granted to all users.
100 * Deprecated AuthPluginAutoCreate hook in favor of LocalUserCreated.
101 * Most cookie-handling methods in User are deprecated.
102 * $wgAllowAsyncCopyUploads and $CopyUploadAsyncTimeout were removed. This was an
103 experimental feature that has never worked.
104 * Login and createaccount tokens now vary by timestamp.
105 * LoginForm::getLoginToken() and LoginForm::getCreateaccountToken()
106 return a MediaWiki\Session\Token, and tokens must be checked using that
108 * $wgEnotifUseJobQ was removed and the job queue is always used.
109 * The functionality of the ApiSandbox extension has been merged into core. The
110 extension should no longer be used.
111 * $wgPreloadJavaScriptMwUtil was removed (deprecated in 1.26).
112 Extensions, skins, gadgets and scripts that use the mediawiki.util module must
113 express a dependency on it.
114 * $wgIncludeLegacyJavaScript, deprecated in MediaWiki 1.26, now defaults false.
115 Extensions, skins, gadgets and scripts that need the mediawiki.legacy.wikibits
116 module should express a dependency on it.
117 * Removed configuration option $wgCopyrightIcon (deprecated since 1.18). Use
118 $wgFooterIcons['copyright']['copyright'] instead.
119 * If the openssl and mcrypt PHP extensions are both unavailable, secure
120 session storage (soon to be used for login) will raise an exception. This
121 exception may be bypassed by setting $wgSessionInsecureSecrets = true.
123 === New features in 1.27 ===
124 * $wgDataCenterUpdateStickTTL was also added. This decides how long a user
125 sticks to the primary DC (via cookies) after they make changes to the site.
126 * Added a new hook, 'UserMailerTransformContent', to transform the contents
127 of an email. This is similar to the EmailUser hook but applies to all mail
129 * Added a new hook, 'UserMailerTransformMessage', to transform the contents
130 of an emai after MIME encoding.
131 * Added a new hook, 'UserMailerSplitTo', to control which users have to be
132 emailed separately (ie. there is a single address in the To: field) so
133 user-specific changes to the email can be applied safely.
134 * $wgCdnMaxageLagged was added, which limits the CDN cache TTL
135 when any load balancer uses a DB that is lagged beyond the 'max lag'
136 setting in the relevant section of $wgLBFactoryConf.
137 * User::newSystemUser() may be used to simplify the creation of passwordless
138 "system" users for logged actions from scripts and extensions.
139 * Extensions can now return detailed error information via the API when
140 preventing user actions using 'getUserPermissionsErrors' and similar hooks
141 by using ApiMessage instances instead of strings for the $result value.
142 * $wgAPIMaxLagThreshold was added to limit bot changes when databases lag
144 * Skins and extensions can now use FlexBox mixins (.flex-display(@display: flex)
145 and .flex(@grow: 1, @shrink: 1, @width: auto, @order: 1)) in Less to create
146 cross-browser-compatible FlexBox rules. Users will still need to add fallback
147 float rules or the like for compatibility with IE9- separately.
148 * Added MWTimestamp::getTimezoneString() which returns the localized timezone
149 string, if available. To localize this string, see the comments of
150 $wgLocaltimezone in includes/DefaultSettings.php.
151 * Added CentralIdLookup, a service that allows extensions needing a concept of
152 "central" users to get that without having to know about specific central
153 authentication extensions.
154 * $wgMaxUserDBWriteDuration added to limit huge user-generated transactions.
155 Regular web request transactions that takes longer than this are aborted.
156 * Added a new hook, 'TitleMoveCompleting', which runs before a page move is
158 * $wgCdnReboundPurgeDelay was added to provide secondary delayed purges of URLs
159 from CDN to mitigate DB replication lag and WAN cache purge lag.
160 * (T49162) Installer will default to setting CACHE_ACCEL as the main cache type
162 * It is now possible to patrol file uploads (both for new files and new versions
163 of existing files). Special:NewFiles has gained an option to filter by patrol
164 status. This functionality can be disabled using $wgUseFilePatrol.
165 * MediaWiki\Session infrastructure allows for easier use of session mechanisms
166 other than the usual cookies.
167 ** SessionMetadata and SessionCheckInfo hooks allow for setting and checking
168 custom session metadata.
169 * Added MWGrants and associated configuration settings $wgGrantPermissions and
170 $wgGrantPermissionGroups to hold configuration for authentication features
171 such as OAuth that want to allow restricting the user rights a user may make
173 ** If you're already using the OAuth extension, these new variables are
174 identical to (and will replace) $wgMWOAuthGrantPermissions and
175 $wgMWOAuthGrantPermissionGroups.
176 * Added MWRestrictions as a class to check restrictions on a WebRequest, e.g.
177 to assert that the request comes from a particular IP range.
178 * Added bot passwords, a rights-restricted login mechanism for API-using bots.
179 * Whitelisted the following HTML attributes for all elements in wikitext:
180 aria-describedby, aria-flowto, aria-label, aria-labelledby, aria-owns.
181 * Removed "presentation" restriction on the HTML role attribute in wikitext.
182 All values are now allowed for the role attribute.
183 * $wgContentHandlers now also supports callbacks to create an instance of the
184 appropriate ContentHandler subclass.
185 * Added $wgAuthenticationTokenVersion, which if non-null prevents the
186 user_token database field from being exposed in cookies. Setting this would
187 be a good idea, but will log out all current sessions.
188 * $wgEventRelayerConfig was added, for managing PubSub event relay configuration,
189 specifically for reliable CDN url purges.
190 * Requests have unique IDs, equal to the UNIQUE_ID environment variable (when
191 MediaWiki is behind Apache+mod_unique_id or something similar) or a randomly-
192 generated 24-character string. This request ID is used to annotate log records
193 and error messages. It is available client-side via mw.config.get( 'wgRequestId' ).
194 The request ID supplants exception IDs. Accordingly, MWExceptionHandler::getLogId()
196 * (T33313) Add a preference for watching uploads by default, also applies
197 to API-based upload tools.
198 * $wgJpegPixelFormat was added to override chroma subsampling for JPEG image
199 thumbnails created via ImageMagick. Defaults to 'yuv420', providing bandwidth
200 savings versus the previous behavior on many files.
202 === External library changes in 1.27 ===
204 ==== Upgraded external libraries ====
205 * Updated oojs/oojs-ui from v0.12.12 to v0.13.3.
206 * Updated composer/semver from v1.0.0 to v1.2.0.
207 * Updated liuggio/statsd-php-client to 1.0.18.
208 * Updated QUnit from v1.18.0 to v1.22.0.
210 ==== New external libraries ====
211 * Added wikimedia/base-convert v1.0.1.
212 * Added wikimedia/cldr-plural-rule-parser v1.0.0.
213 * Added wikimedia/relpath v1.0.3.
214 * Added wikimedia/running-stat v1.1.0.
215 * Added wikimedia/php-session-serializer v1.0.3.
217 ==== Removed and replaced external libraries ====
219 === Bug fixes in 1.27 ===
220 * Special:Upload will now display correct maximum allowed file size when running
221 under HHVM (T116347).
223 === Action API changes in 1.27 ===
224 * Added list=allrevisions.
225 * generator=recentchanges now has the option to generate revids.
226 * ApiPageSet::setRedirectMergePolicy() was added. This allows generator
227 modules to define how generator data for a redirect source gets merged
228 into the redirect destination.
229 * prop=imageinfo&iiprop=uploadwarning will no longer include the possibility of
230 "was-deleted" warning.
231 * Added difftotextpst to query=revisions which preforms a pre-save transform on
232 the text before diffing it.
233 * Deprecated formats dbg, txt, and yaml have been removed.
234 * (T47988) The protect log event details now use new-style formatting.
235 * The following response properties from action=login are deprecated, and may
236 be removed in the future: lgtoken, cookieprefix, sessionid. Clients should
237 handle cookies to properly manage session state.
238 * action=login transparently allows login using bot passwords. Clients should
239 merely need to change the username and password used after setting up a bot
241 * action=upload no longer understands statuskey, asyncdownload or leavemessage.
243 === Action API internal changes in 1.27 ===
244 * ApiQueryORM removed.
245 * The following classes have been removed:
249 * ApiBase::addTokenProperties() was removed (deprecated since 1.24).
250 * ApiBase::getFinalPossibleErrors() was removed (deprecated since 1.24).
251 * ApiBase::getFinalResultProperties() was removed (deprecated since 1.24).
252 * ApiBase::getRequireAtLeastOneParameterErrorMessages() was removed (deprecated since 1.24).
253 * ApiBase::getPossibleErrors() was removed (deprecated since 1.24).
254 * ApiBase::getRequireMaxOneParameterErrorMessages() was removed (deprecated since 1.24).
255 * ApiBase::getRequireOnlyOneParameterErrorMessages() was removed (deprecated since 1.24).
256 * ApiBase::getResultProperties() was removed (deprecated since 1.24).
257 * ApiBase::getTitleOrPageIdErrorMessage() was removed (deprecated since 1.24).
258 * ApiBase::parseErrors() was removed (deprecated since 1.24).
259 * ApiQueryBase::titleToKey(), ApiQueryBase::keyToTitle() and
260 ApiQueryBase::keyPartToTitle() all removed (deprecated since 1.24).
261 * ApiQueryBase::checkRowCount() was removed (deprecated since 1.24).
262 * ApiQueryBase::getDirectionDescription() was removed (deprecated since 1.25).
263 * ApiQuery::getGenerators() was removed (deprecated since 1.21).
264 * ApiQuery::getModules() was removed (deprecated since 1.21).
265 * ApiQuery::getModuleType() was removed (deprecated since 1.21).
266 * ApiQuery::setGeneratorContinue() was removed (deprecated since 1.24).
267 * ApiMain::getModules() was removed (deprecated since 1.21).
268 * ApiBase::getVersion() was removed (deprecated since 1.21).
269 * ApiMain::getShowVersions() was removed (deprecated in 1.21).
270 * ApiMain::addModule() was removed (deprecated in 1.21).
271 * ApiMain::addFormat() was removed (deprecated in 1.21).
272 * ApiMain::getFormats() was removed (deprecated in 1.21).
273 * ApiPageSet::finishPageSetGeneration() was removed (deprecated in 1.21).
275 === Languages updated in 1.27 ===
277 MediaWiki supports over 350 languages. Many localisations are updated
278 regularly. Below only new and removed languages are listed, as well as
279 changes to languages because of Phabricator reports.
281 * (T113688) Change default numerals from Gurmukhi to Arabic for Punjabi locale.
282 * (T116020) Aliases of magic words in MessagesXx.php are sorted by usage.
284 === Other changes in 1.27 ===
285 * Added dependency injection (DI) infrastructure, see docs/injection.txt for details.
286 It is planned to incrementally move MediaWiki code towards using DI, using the
287 service locator (SL) pattern as a stepping stone.
288 * ProfilerOutputUdp was removed. Note that there is a ProfilerOutputStats class.
289 * WikiPage::doDeleteArticleReal() and WikiPage::doDeleteArticle() now
290 ignore the 2nd and 3rd arguments (formerly $id and $commit).
291 * Removed "loaderScripts" option from ResourceLoaderFileModule class.
292 * Removed ORM-like wrapper added in 1.20.
293 * LinkCache::getGoodLinks and LinkCache::getBadLinks were removed
294 (deprecated in 1.26).
295 * WikiPage::doQuickEdit() was removed (deprecated since 1.21).
296 * Removed SiteObject and SiteArray classes (deprecated in 1.21).
297 * MessageBlobStore::getInstance() was removed (deprecated since 1.25).
298 * (T84937) Free external links ("autolinked" urls) will now be terminated
299 by and HTML entity encodings of  , <, and >.
300 * (T36948) The default file revert message's timestamp is now in
301 $wgLocaltimezone, instead of UTC.
302 * The default name of the 'suppress' group page has been changed from
303 'Project:Oversight' to 'Project:Suppress'.
304 * DatabaseBase::resultObject() is now protected (use outside Database classes
305 not necessary since 1.11).
306 * Calling ResourceLoaderFileModule::readStyleFiles() without a
307 ResourceLoaderContext instance is deprecated.
308 * ResourceLoader::getLessCompiler() now takes an optional parameter of
309 additional LESS variables to set for the compiler.
310 * wfBaseConvert() marked as deprecated, use Wikimedia\base_convert() directly
312 * Obsolete maintenance scripts clearCacheStats.php and showCacheStats.php
313 were removed. The underlying data is sent to StatsD (see $wgStatsdServer).
314 * Removed msg_resource_links database table and associated code.
315 * Removed msg_resource database table and associated code.
316 * Skin::getNamespaceNotice() was removed.
317 * wfIsConfiguredProxy() was removed (deprecated since 1.24).
318 * wfDebugTimer() was removed (deprecated since 1.25).
319 * wfIsTrustedProxy() was removed (deprecated since 1.24).
320 * wfGetIP() was removed (deprecated since 1.19).
321 * MWHookException was removed.
322 * OutputPage::appendSubtitle() was removed (deprecated since 1.19).
323 * OutputPage::loginToUse() was removed (deprecated since 1.19).
324 * Article::loadContent() was removed (deprecated since 1.19).
325 * User::editToken() was removed (deprecated since 1.19).
326 * Removed --force-normal option of dumpBackup.php, as it no longer served
327 any useful purpose since 1.22.
328 * The functions processOption() and processArgs() on the BackupDumper and
329 TextPassDumper classes have been removed.
330 * The maintenance/backupTextPass.inc file was deleted. You should include
331 maintenance/dumpTextPass.php instead.
332 * WikiPage::getUsedTemplates() was removed (deprecated since 1.19).
333 * wfEmptyMsg() was removed (deprecated since 1.18).
334 * OutputPage::permissionRequired() was removed (deprecated since 1.18).
335 * OutputPage::blockedPage() was removed (deprecated since 1.18).
336 * User::getSkin() was removed (deprecated since 1.18).
337 * OutputPage::includeJQuery() was removed (deprecated since 1.17).
338 * WikiPage::updateRestrictions() was removed (deprecated since 1.19).
339 * WikiPage::testPreSaveTransform() was removed (deprecated since 1.19).
340 * LogPage::logName() was removed (deprecated since 1.19).
341 * LogPage::logHeader() was removed (deprecated since 1.19).
342 * wfCheckLimits() was removed (deprecated since 1.24).
343 * Linker::makeKnownLinkObj() was removed (deprecated since 1.16).
344 * Linker::makeLinkObj() was removed (deprecated since 1.16).
345 * wfMsgForContentNoTrans() was removed (deprecated since 1.18).
346 * ChangesList::usePatrol was removed (deprecated since 1.22).
347 * wfMsgNoTrans() was removed (deprecated since 1.18).
348 * Linker::makeImageLink2 was removed (deprecated since 1.20).
349 * Title::userIsWatching() was removed (deprecated since 1.20).
350 * Removed WaitForSlave maintenance script; use SELECT MASTER_POS_WAIT()
351 database function directly instead.
352 * wfMsg() was removed (deprecated since 1.18).
353 * wfMsgForContent() was removed (deprecated since 1.18).
354 * wfMsgReal() was removed (deprecated since 1.18).
355 * wfMsgGetKey() was removed (deprecated since 1.18).
356 * wfMsgHtml() was removed (deprecated since 1.18).
357 * wfMsgWikiHtml() was removed (deprecated since 1.18).
358 * wfMsgExt() was removed (deprecated since 1.18).
359 * Language::armourMath() was removed (deprecated since 1.22).
360 * LanguageConverter::armourMath() was removed (deprecated since 1.22).
361 * FakeConverter::armourMath() was removed (deprecated since 1.22).
362 * The unused jquery.validate ResourceLoader module was removed.
363 * FileRepo::getRootUrl() was removed (deprecated since 1.20).
364 * User::generateToken() was removed (deprecated since 1.20).
365 * WikiPage::getRawText() was removed (deprecated since 1.21).
366 * ParserOutput::hasCustomDataUpdates() was removed (deprecated since 1.25).
367 * ParserOutput::addSecondaryDataUpdate() was removed (deprecated since 1.25).
368 * ParserOutput::getSecondaryDataUpdates() was removed (deprecated since 1.25).
369 * Gallery images with multiple caption pipes no longer concatenate them all
370 together but instead pick the final one, similar to image syntax.
371 * XML-like parser tags (such as <gallery>), when unclosed, will be left unparsed
372 rather than consume everything until the end of the page.
373 * New maintenance script resetUserEmail.php allows sysadmins to reset user emails in case
374 a user forgot password/account was stolen.
375 * wfCheckEntropy() was removed (deprecated in 1.27).
376 * Browser support for Internet Explorer 8 lowered from Grade A to Grade C.
377 * ContentHandler::supportsCategories method added. Default is true.
378 CategoryMembershipChangeJob updates are skipped for content that
379 does not support categories.
380 * wikidiff difference engine is no longer supported, anyone still using it are encouraged
381 to upgrade to wikidiff2 which is actively maintained and has better package availability.
382 * Database logic was removed from WatchedItem and a WatchedItemStore was created:
383 ** WatchedItem::IGNORE_USER_RIGHTS and WatchedItem::CHECK_USER_RIGHTS were deprecated.
384 User::IGNORE_USER_RIGHTS and User::CHECK_USER_RIGHTS were introduced.
385 ** WatchedItem::fromUserTitle was deprecated in favour of the constructor.
386 ** WatchedItem::resetNotificationTimestamp was deprecated.
387 ** WatchedItem::batchAddWatch was deprecated.
388 ** WatchedItem::addWatch was deprecated.
389 ** WatchedItem::removeWatch was deprecated.
390 ** WatchedItem::isWatched was deprecated.
391 ** WatchedItem::duplicateEntries was deprecated.
392 ** EmailNotification::updateWatchlistTimestamp was deprecated.
393 ** User::getWatchedItem was removed.
394 * Unit tests don't work with external PHPUnit anymore, Composer is now the only supported
395 way. Run `composer install` to install it and other dev dependencies to run unit tests.
396 * wl_id field added to the watchlist table.
397 * Revision::getRawText() was removed (deprecated since 1.21).
398 * WikiPage::replaceSection() was removed (deprecated since 1.21).
399 * Article::replaceSection() was removed (deprecated since 1.21).
400 * Language::getLangObj() was removed (deprecated since 1.24).
401 * Language::getLanguageName() was removed (deprecated since 1.20).
402 * Language::getLanguageNames() was removed (deprecated since 1.20).
403 * Language::getTranslatedLanguageNames() was removed (deprecated since 1.20).
404 * Language::specialPage() was removed (deprecated since 1.24).
405 * MediaWikiTestCase::assertException() was removed (deprecated since 1.22).
406 * OutputPage::getHeadItems() was removed (deprecated since 1.24).
407 * OutputPage::getScript() was removed (deprecated since 1.24).
408 * OutputPage::out() was removed (deprecated since 1.22).
409 * OutputPage::setAllowedModules() was removed (deprecated since 1.24).
410 * UserrightsPage::makeGroupNameListForLog() was removed (deprecated since 1.21).
411 * MediaWikiSite::newFromGlobalId() was removed (deprecated since 1.21).
412 * Title::newFromRedirect() was removed (deprecated since 1.21).
413 * Skin::commonPrintStylesheet() was removed (deprecated since 1.22).
414 * Skin::getCommonStylePath() was removed (deprecated since 1.24).
415 * Skin::newFromKey() was removed (deprecated since 1.24).
416 * Skin::getUsableSkins() was removed (deprecated since 1.23).
417 * LoadBalancer::pickRandom() was removed (deprecated in 1.21).
418 * Article::getUndoText() and WikiPage::getUndoText were removed (deprecated since
420 * DifferenceEngine::setText() was removed (deprecated in 1.21).
421 * Title::newFromRedirectArray() was removed (deprecated in 1.21).
422 * UserMailer::send() no longer accepts $replyto as the 5th argument and $contentType
423 as the 6th. These must be passed in the options array now.
424 * Title::newFromRedirectRecurse() was removed (deprecated in 1.21).
425 * Skin::accesskey was removed (deprecated since 1.21).
426 * Skin::blockLink was removed (deprecated since 1.21).
427 * Skin::buildRollbackLink was removed (deprecated since 1.21).
428 * Skin::emailLink was removed (deprecated since 1.21).
429 * Skin::formatComment was removed (deprecated since 1.21).
430 * Skin::formatHiddenCategories was removed (deprecated since 1.21).
431 * Skin::formatLinksInComment was removed (deprecated since 1.21).
432 * Skin::formatRevisionSize was removed (deprecated since 1.21).
433 * Skin::formatSize was removed (deprecated since 1.21).
434 * Skin::formatTemplates was removed (deprecated since 1.21).
435 * Skin::generateTOC was removed (deprecated since 1.21).
436 * Skin::getInternalLinkAttributes was removed (deprecated since 1.21).
437 * Skin::getInternalLinkAttributesObj was removed (deprecated since 1.21).
438 * Skin::getInterwikiLinkAttributes was removed (deprecated since 1.21).
439 * Skin::getInvalidTitleDescription was removed (deprecated since 1.21).
440 * Skin::getLinkColour was removed (deprecated since 1.21).
441 * Skin::getRevDeleteLink was removed (deprecated since 1.21).
442 * Skin::getRollbackEditCount was removed (deprecated since 1.21).
443 * Skin::makeBrokenImageLinkObj was removed (deprecated since 1.21).
444 * Skin::makeCommentLink was removed (deprecated since 1.21).
445 * Skin::makeExternalImage was removed (deprecated since 1.21).
446 * Skin::makeExternalLink was removed (deprecated since 1.21).
447 * Skin::makeHeadline was removed (deprecated since 1.21).
448 * Skin::makeImageLink was removed (deprecated since 1.21).
449 * Skin::makeMediaLinkFile was removed (deprecated since 1.21).
450 * Skin::makeMediaLinkObj was removed (deprecated since 1.21).
451 * Skin::makeSelfLinkObj was removed (deprecated since 1.21).
452 * Skin::makeThumbLink2 was removed (deprecated since 1.21).
453 * Skin::makeThumbLinkObj was removed (deprecated since 1.21).
454 * Skin::normaliseSpecialPage was removed (deprecated since 1.21).
455 * Skin::normalizeSubpageLink was removed (deprecated since 1.21).
456 * Skin::processResponsiveImages was removed (deprecated since 1.21).
457 * Skin::revComment was removed (deprecated since 1.21).
458 * Skin::revDeleteLink was removed (deprecated since 1.21).
459 * Skin::revDeleteLinkDisabled was removed (deprecated since 1.21).
460 * Skin::revUserLink was removed (deprecated since 1.21).
461 * Skin::revUserTools was removed (deprecated since 1.21).
462 * Skin::specialLink was removed (deprecated since 1.21).
463 * Skin::splitTrail was removed (deprecated since 1.21).
464 * Skin::titleAttrib was removed (deprecated since 1.21).
465 * Skin::tocIndent was removed (deprecated since 1.21).
466 * Skin::tocLine was removed (deprecated since 1.21).
467 * Skin::tocLineEnd was removed (deprecated since 1.21).
468 * Skin::tocList was removed (deprecated since 1.21).
469 * Skin::tocUnindent was removed (deprecated since 1.21).
470 * Skin::tooltip was removed (deprecated since 1.21).
471 * Skin::tooltipAndAccesskeyAttribs was removed (deprecated since 1.21).
472 * Skin::userTalkLink was removed (deprecated since 1.21).
473 * Skin::userToolLinksRedContribs was removed (deprecated since 1.21).
474 * wikidiff3 is now the default and only PHP diff engine. It provides improved diff
475 performance on complex changes. $wgExternalDiffEngine = 'wikidiff3' therefore
476 makes no difference now. Users are still recommended to use wikidiff2 if possible,
481 MediaWiki 1.27 requires PHP 5.5.9 or later. There is experimental support for
484 MySQL is the recommended DBMS. PostgreSQL or SQLite can also be used, but
485 support for them is somewhat less mature. There is experimental support for
486 Oracle and Microsoft SQL Server.
488 The supported versions are:
490 * MySQL 5.0.3 or later
491 * PostgreSQL 8.3 or later
492 * SQLite 3.3.7 or later
493 * Oracle 9.0.1 or later
494 * Microsoft SQL Server 2005 (9.00.1399)
498 1.27 has several database changes since 1.26, and will not work without schema
499 updates. Note that due to changes to some very large tables like the revision
500 table, the schema update may take quite long (minutes on a medium sized site,
501 many hours on a large site).
503 If upgrading from before 1.11, and you are using a wiki as a commons
504 repository, make sure that it is updated as well. Otherwise, errors may arise
505 due to database schema changes.
507 If upgrading from before 1.7, you may want to run refreshLinks.php to ensure
508 new database fields are filled with data.
510 If you are upgrading from MediaWiki 1.4.x or earlier, you should upgrade to
511 1.5 first. The upgrade script maintenance/upgrade1_5.php has been removed
514 Don't forget to always back up your database before upgrading!
516 See the file UPGRADE for more detailed upgrade instructions.
518 For notes on 1.26.x and older releases, see HISTORY.
520 == Online documentation ==
522 Documentation for both end-users and site administrators is available on
523 MediaWiki.org, and is covered under the GNU Free Documentation License (except
524 for pages that explicitly state that their contents are in the public domain):
526 https://www.mediawiki.org/wiki/Documentation
530 A mailing list is available for MediaWiki user support and discussion:
532 https://lists.wikimedia.org/mailman/listinfo/mediawiki-l
534 A low-traffic announcements-only list is also available:
536 https://lists.wikimedia.org/mailman/listinfo/mediawiki-announce
538 It's highly recommended that you sign up for one of these lists if you're
539 going to run a public MediaWiki, so you can be notified of security fixes.
543 There's usually someone online in #mediawiki on irc.freenode.net.