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.
6 THIS IS NOT A RELEASE YET
8 MediaWiki 1.27 is an alpha-quality branch and is not recommended for use in
11 === Configuration changes in 1.27 ===
12 * $wgUseLinkNamespaceDBFields was removed.
13 * Deprecated $wgResourceLoaderMinifierStatementsOnOwnLine and
14 $wgResourceLoaderMinifierMaxLineLength, because there was little value in
15 making the behavior configurable. The default values (`false` for the former,
16 1000 for the latter) are now hard-coded.
17 * $wgDebugDumpSqlLength was removed (deprecated in 1.24).
18 * $wgDebugDBTransactions was removed (deprecated in 1.20).
19 * $wgUseXVO has been removed, as it provides functionality only used by
20 custom Wikimedia patches against Squid 2.x that probably noone uses in
21 production anymore. There is now $wgUseKeyHeader that provides similar
22 functionality but instead of the MediaWiki-specific X-Vary-Options header,
23 uses the draft Key header standard.
24 * $wgScriptExtension (and support for '.php5' entry points) was removed. See the
25 deprecation notice in the release notes for version 1.25 for advice on how to
26 preserve support for '.php5' entry points via URL rewriting.
27 * Password handling via the User object has been deprecated and partially
28 removed, pending the future introduction of AuthManager. In particular:
29 ** expirePassword(), getPasswordExpireDate(), resetPasswordExpiration(), and
30 getPasswordExpired() have been removed. They were unused outside of core.
31 ** The mPassword, mNewpassword, mNewpassTime, and mPasswordExpires fields are
32 now private and will be removed in the future.
33 ** The getPassword() and getTemporaryPassword() methods now throw
34 BadMethodCallException and will be removed in the future.
35 ** The ability to pass 'password' and 'newpassword' to createNew() has been
36 removed. The only users of it seem to have been using it to set invalid
37 passwords, and so shouldn't be greatly affected.
38 ** setPassword(), setInternalPassword(), and setNewpassword() have been
39 deprecated, pending the introduction of AuthManager.
40 ** User::randomPassword() is deprecated in favor of a new method
41 PasswordFactory::generateRandomPasswordString()
42 ** User::getPasswordFactory() is deprecated, callers should just create a
43 PasswordFactory themselves.
44 ** A new constructor, User::newSystemUser(), has been added to simplify the
45 creation of passwordless "system" users for logged actions.
46 * $wgMaxSquidPurgeTitles was removed.
47 * $wgAjaxWatch was removed. This is now enabled by default.
48 * $wgUseInstantCommons now hotlinks Commons images by default instead of
49 downloading originals and thumbnailing them locally. This allows wikis to save
50 on CPU and bandwidth while reducing time to first byte for pages, even without
51 a thumbnail handler. See $wgForeignFileRepos documentation for tweaks.
52 * (T27397) WebP is enabled by default as an uploadable filetype.
53 * (T48998) $wgArticlePath must now be either a full url, or start with a "/".
54 * $wgRateLimitLog was removed; use $wgDebugLogGroups['ratelimit'] instead.
55 * Deprecated API formats dbg, txt, and yaml have been removed.
56 * CLDRPluralRule* classes have been replaced with wikimedia/cldr-plural-rule-parser.
57 * Removed $wgProfilePerHost, $wgUDPProfilerHost, $wgUDPProfilerPort,
58 $wgUDPProfilerFormatString, $wgStatsMethod, $wgAggregateStatsID, $wgStatsFormatString,
59 and $wgProfileCallTree (deprecated since 1.20).
60 * For proper operation of LocalIdLookup with shared user tables, ensure that
61 $wgSharedDB and $wgSharedTables are properly set even on the "central" wiki
62 that all others are sharing from and that $wgLocalDatabases is set to the
63 full list of sharing wikis on all those wikis.
65 === New features in 1.27 ===
66 * $wgDataCenterId and $wgDataCenterRoles where added, which will serve as
67 basic configuration settings needed for multi-datacenter setups.
68 $wgDataCenterUpdateStickTTL was also added.
69 * Added a new hook, 'UserMailerTransformContent', to transform the contents
70 of an email. This is similar to the EmailUser hook but applies to all mail
72 * Added a new hook, 'UserMailerTransformMessage', to transform the contents
73 of an emai after MIME encoding.
74 * Added a new hook, 'UserMailerSplitTo', to control which users have to be
75 emailed separately (ie. there is a single address in the To: field) so
76 user-specific changes to the email can be applied safely.
77 * $wgCdnMaxageLagged was added, which limits the CDN cache TTL
78 when any load balancer uses a DB that is lagged beyond the 'max lag'
79 setting in the relevant section of $wgLBFactoryConf.
80 * User::newSystemUser() may be used to simplify the creation of passwordless
81 "system" users for logged actions from scripts and extensions.
82 * Extensions can now return detailed error information via the API when
83 preventing user actions using 'getUserPermissionsErrors' and similar hooks
84 by using ApiMessage instances instead of strings for the $result value.
85 * $wgAPIMaxLagThreshold was added to limit bot changes when databases lag
87 * Skins and extensions can now use FlexBox mixins (.flex-display(@display: flex)
88 and .flex(@grow: 1, @shrink: 1, @width: auto, @order: 1)) in Less to create
89 cross-browser-compatible FlexBox rules. Users will still need to add fallback
90 float rules or the like for compatibility with IE9- separately.
91 * Added MWTimestamp::getTimezoneString() which returns the localized timezone
92 string, if available. To localize this string, see the comments of
93 $wgLocaltimezone in includes/DefaultSettings.php.
94 * Added CentralIdLookup, a service that allows extensions needing a concept of
95 "central" users to get that without having to know about specific central
96 authentication extensions.
97 * $wgMaxUserDBWriteDuration added to limit huge user-generated transactions.
98 Regular web request transactions that takes longer than this are aborted.
99 * Added a new hook, 'TitleMoveCompleting', which runs before a page move is committed.
100 * $wgCdnReboundPurgeDelay was added to provide secondary delayed purges of URLs
101 from CDN to mitigate DB replication lag and WAN cache purge lag.
103 === External library changes in 1.27 ===
104 ==== Upgraded external libraries ====
105 * Updated oojs/oojs-ui from v0.12.12 to v0.13.3.
106 * Updated composer/semver from v1.0.0 to v1.2.0.
107 * Update liuggio/statsd-php-client to 1.0.18.
109 ==== New external libraries ====
110 * Added wikimedia/base-convert v1.0.1.
111 * Added wikimedia/cldr-plural-rule-parser v1.0.0.
112 * Added wikimedia/relpath v1.0.3.
113 * Added wikimedia/running-stat v1.1.0.
115 ==== Removed and replaced external libraries ====
117 === Bug fixes in 1.27 ===
118 * Special:Upload will now display correct maximum allowed file size when running
119 under HHVM (T116347).
121 === Action API changes in 1.27 ===
122 * Added list=allrevisions.
123 * generator=recentchanges now has the option to generate revids.
124 * ApiPageSet::setRedirectMergePolicy() was added. This allows generator
125 modules to define how generator data for a redirect source gets merged
126 into the redirect destination.
127 * prop=imageinfo&iiprop=uploadwarning will no longer include the possibility of
128 "was-deleted" warning.
129 * Added difftotextpst to query=revisions which preforms a pre-save transform on
130 the text before diffing it.
131 * Deprecated formats dbg, txt, and yaml have been removed.
132 * (T47988) The protect log event details now use new-style formatting.
133 * The following response properties from action=login are deprecated, and may
134 be removed in the future: lgtoken, cookieprefix, sessionid. Clients should
135 handle cookies to properly manage session state.
137 === Action API internal changes in 1.27 ===
138 * ApiQueryORM removed.
139 * The following classes have been removed:
143 * ApiQueryBase::titleToKey(), ApiQueryBase::keyToTitle() and
144 ApiQueryBase::keyPartToTitle() all removed (deprecated since 1.24).
145 * ApiQueryBase::checkRowCount() was removed (deprecated since 1.24).
146 * ApiQueryBase::getDirectionDescription() was removed (deprecated since 1.25).
147 * ApiQuery::getModules() was removed (deprecated since 1.21).
148 * ApiMain::getModules() was removed (deprecated since 1.21).
150 === Languages updated in 1.27 ===
152 MediaWiki supports over 350 languages. Many localisations are updated
153 regularly. Below only new and removed languages are listed, as well as
154 changes to languages because of Phabricator reports.
156 * (T113688) Change default numerals from Gurmukhi to Arabic for Punjabi locale.
158 === Other changes in 1.27 ===
159 * ProfilerOutputUdp was removed. Note that there is a ProfilerOutputStats class.
160 * WikiPage::doDeleteArticleReal() and WikiPage::doDeleteArticle() now
161 ignore the 2nd and 3rd arguments (formerly $id and $commit).
162 * Removed "loaderScripts" option from ResourceLoaderFileModule class.
163 * Removed ORM-like wrapper added in 1.20.
164 * LinkCache::getGoodLinks and LinkCache::getBadLinks were removed (deprecated in 1.26).
165 * WikiPage::doQuickEdit() was removed (deprecated since 1.21).
166 * Removed SiteObject and SiteArray classes (deprecated in 1.21).
167 * MessageBlobStore::getInstance() was removed (deprecated since 1.25).
168 * (T84937) Free external links ("autolinked" urls) will now be terminated
169 by and HTML entity encodings of  , <, and >.
170 * (T36948) The default file revert message's timestamp is now in $wgLocaltimezone,
172 * The default name of the 'suppress' group page has been changed from
173 'Project:Oversight' to 'Project:Suppress'.
174 * DatabaseBase::resultObject() is now protected (use outside Database classes
175 not necessary since 1.11).
176 * Calling ResourceLoaderFileModule::readStyleFiles() without a
177 ResourceLoaderContext instance is deprecated.
178 * ResourceLoader::getLessCompiler() now takes an optional parameter of
179 additional LESS variables to set for the compiler.
180 * wfBaseConvert() marked as deprecated, use Wikimedia\base_convert() directly instead.
181 * Obsolete maintenance scripts clearCacheStats.php and showCacheStats.php
182 were removed. The underlying data is sent to StatsD (see $wgStatsdServer).
183 * Removed msg_resource_links database table and associated code.
184 * Removed msg_resource database table and associated code.
185 * Skin::getNamespaceNotice() was removed.
186 * wfIsConfiguredProxy() was removed (deprecated since 1.24).
187 * wfDebugTimer() was removed (deprecated since 1.25).
188 * wfIsTrustedProxy() was removed (deprecated since 1.24).
189 * wfGetIP() was removed (deprecated since 1.19).
190 * MWHookException was removed.
191 * OutputPage::appendSubtitle() was removed (deprecated since 1.19).
192 * OutputPage::loginToUse() was removed (deprecated since 1.19).
193 * Article::loadContent() was removed (deprecated since 1.19).
194 * User::editToken() was removed (deprecated since 1.19).
195 * Removed --force-normal option of dumpBackup.php, as it no longer served
196 any useful purpose since 1.22.
197 * The functions processOption() and processArgs() on the BackupDumper and
198 TextPassDumper classes have been removed.
199 * The maintenance/backupTextPass.inc file was deleted. You should include
200 maintenance/dumpTextPass.php instead.
201 * WikiPage::getUsedTemplates() was removed (deprecated since 1.19).
202 * wfEmptyMsg() was removed (deprecated since 1.18).
203 * OutputPage::permissionRequired() was removed (deprecated since 1.18).
204 * OutputPage::blockedPage() was removed (deprecated since 1.18).
205 * User::getSkin() was removed (deprecated since 1.18).
206 * OutputPage::includeJQuery() was removed (deprecated since 1.17).
207 * WikiPage::updateRestrictions() was removed (deprecated since 1.19).
208 * WikiPage::testPreSaveTransform() was removed (deprecated since 1.19).
209 * LogPage::logName() was removed (deprecated since 1.19).
210 * LogPage::logHeader() was removed (deprecated since 1.19).
211 * wfCheckLimits() was removed (deprecated since 1.24).
212 * Linker::makeKnownLinkObj() was removed (deprecated since 1.16).
213 * Linker::makeLinkObj() was removed (deprecated since 1.16).
214 * wfMsgForContentNoTrans() was removed (deprecated since 1.18).
218 MediaWiki 1.27 requires PHP 5.3.3 or later. There is experimental support for
221 MySQL is the recommended DBMS. PostgreSQL or SQLite can also be used, but
222 support for them is somewhat less mature. There is experimental support for
223 Oracle and Microsoft SQL Server.
225 The supported versions are:
227 * MySQL 5.0.3 or later
228 * PostgreSQL 8.3 or later
229 * SQLite 3.3.7 or later
230 * Oracle 9.0.1 or later
231 * Microsoft SQL Server 2005 (9.00.1399)
235 1.27 has several database changes since 1.26, and will not work without schema
236 updates. Note that due to changes to some very large tables like the revision
237 table, the schema update may take quite long (minutes on a medium sized site,
238 many hours on a large site).
240 If upgrading from before 1.11, and you are using a wiki as a commons
241 repository, make sure that it is updated as well. Otherwise, errors may arise
242 due to database schema changes.
244 If upgrading from before 1.7, you may want to run refreshLinks.php to ensure
245 new database fields are filled with data.
247 If you are upgrading from MediaWiki 1.4.x or earlier, you should upgrade to
248 1.5 first. The upgrade script maintenance/upgrade1_5.php has been removed
251 Don't forget to always back up your database before upgrading!
253 See the file UPGRADE for more detailed upgrade instructions.
255 For notes on 1.26.x and older releases, see HISTORY.
257 == Online documentation ==
259 Documentation for both end-users and site administrators is available on
260 MediaWiki.org, and is covered under the GNU Free Documentation License (except
261 for pages that explicitly state that their contents are in the public domain):
263 https://www.mediawiki.org/wiki/Documentation
267 A mailing list is available for MediaWiki user support and discussion:
269 https://lists.wikimedia.org/mailman/listinfo/mediawiki-l
271 A low-traffic announcements-only list is also available:
273 https://lists.wikimedia.org/mailman/listinfo/mediawiki-announce
275 It's highly recommended that you sign up for one of these lists if you're
276 going to run a public MediaWiki, so you can be notified of security fixes.
280 There's usually someone online in #mediawiki on irc.freenode.net.