MediaWiki 1.15

MediaWiki is an extremely powerful, scaleable software and a feature-rich wiki implementation, that uses PHP to process and display data stored in its MySQL database.
MediaWiki is designed to handle a large number of users and pages without imposing too rigid a structure or workflow. It is licensed under the GNU General Public License (GPL).
Pages use MediaWikis wikitext format, so that users without knowledge of XHTML or CSS can edit them easily.
When a user submits an edit to a page, MediaWiki writes it to the database, but without deleting the previous versions of the page, thus allowing easy reverts in case of vandalism or spamming.
MediaWiki can manage image and multimedia files, too, which are stored in the filesystem. For large wikis with lots of users, MediaWiki supports caching and can be easily coupled with Squid proxy server software.

System requirements:
- PHP 5 (5.1 recommended). PHP 4 is no longer supported.
- MySQL 3.23.x is no longer supported; some older hosts may need to upgrade. At this time we still recommend 4.0, but 4.1/5.0 will work fine in most cases.
- Apache

Enhancements
- Removed category redirect feature, implementation was incomplete.
- (bug 18846) Remove update_password_format(), unnecessary, destroys all passwords if a wiki with $wgPasswordSalt=false is upgraded with the web installer.
- (bug 19127) Documentation warning for PostgreSQL users who run update.php: use the same user in AdminSettings.php as in LocalSettings.php.
- Fixed possible web invocation of some maintenance scripts, due to the use of include() instead of require(). A full exploit would require a very strange web server configuration.
- Localisation updates.
Configuration changes:
- Added $wgNewPasswordExpiry, to specify an expiry time (in seconds) to temporary passwords
- Added $wgUseTwoButtonsSearchForm to choose the Search form behavior/look
- Added $wgNoFollowDomainExceptions to allow exempting particular domain names from rel="nofollow" on external links
- (bug 12970) Brought back $wgUseImageResize.
- Added $wgRedirectOnLogin to allow specifying a specifc page to redirect users to upon logging in (ex: "Main Page")
- Add $wgExportFromNamespaces for enabling/disabling the "export all from namespace" option (disabled by default)
New features:
- (bug 2242) Add an expiry time to temporary passwords
- (bug 9947) Add PROTECTIONLEVEL parser function to return the protection level for the current page for a given action
- (bug 17002) Add &minor= and −mary= as parameters in the url when editing, to automatically add a summary or a minor edit.
- (bug 16852) padleft and padright now accept multiletter pad characters
- When using UserCreateForm hook to add new checkboxes into Special:UserLogin/signup, the messages can now contain HTML to allow hyperlinking to the sites Terms of Service page, for example
- Add new hook UserLoadFromDatabase that is called while loading a user from the database.
- (bug 17045) Options on the block form are prefilled with the options of the existing block when modifying an existing block.
- (bug 17055) "(show/hide)" links to Special:RevisionDelete now use a CSS class rather than hardcoded HTML tags
- Added new hook WantedPages:getSQL into SpecialWantedpages.php to allow extensions to alter the SQL query which is used to get the list of wanted pages
- (bugs 16957/16969) Add show/hide to preferences for RC patrol options on specialpages
- (bug 11443) Auto-noindex user/user talk pages for blocked user
- (bug 11644) Add $wgMaxRedirects variable to control how many redirects are recursed through until the "destination" page is reached.
- Add $wgInvalidRedirectTargets variable to prevent redirects to certain special pages.
- Use HTML5 rel attributes for some links, where appropriate
- Added optional alternative Search form look - Go button & Advanced search link instead of Go button & Search button
- (bug 2314) Add links to user custom CSS and JS to Special:Preferences
- More helpful error message on raw page access if PHP_SELF isnt set
- (bug 13040) Gender switch in user preferences
- (bug 13040) {{GENDER:}} magic word for interface messages
- (bug 3301) Optionally sort user list according to account creation time
- Remote description pages for foreign file repos are now fetched in the content language.
- (bug 17180) If $wgUseFileCache is enabled, $wgShowIPinHeader is automatically set to false.
- (bug 16604) Mark non-patrolled edits in feeds with "!"
- (bug 16604) Show title/rev in IRC for patrol log
- (bug 16854) Whether a page is being parsed as a preview or section preview can now be determined and set with ParserOptions.
- Wrap message confirmemail_pending into a div with CSS classes "error" and "mw-confirmemail-pending"
- (bug 8249) The magic words for namespaces and pagenames can now be used as parser functions to return the desired namespace or normalized title/title part for a given title.
- (bug 17110) Styled #mw-data-after-content in cologneblue.css to match the rest of the font
- (bug 7556) Time zone names in signatures lack i18n
- (bug 3311) Automatic category redirects
- (bug 17236) Suppress watch user page link for IP range blocks
- Wrap message searchresulttext (Special:Search) into a div with class "mw-searchresult"
- (bug 15283) Interwiki imports can now fetch included templates
- Treat svn:// URLs as external links by default
- New function to convert namespace text for display (only applies on wiki with LanguageConverter class)
- (bug 17379) Contributions-title is now parsed for magic words.
- Preprocessor output now cached in memcached.
- (bug 14468) Lines in classic RecentChanges and Watchlist have classes "mw-line-odd" and "mw-line-even" to make styling using css possible.
- (bug 17311) Add a note beside the gender selection menu to tell users that this information will be public
- Localize time zone regions in Special:Preferences
- Add NUMBEROFACTIVEUSERS magic word, which is like NUMBEROFUSERS, but uses the active users data from site_stats.
- Add a tag on redirected page views
- Replace hardcoded ... as indication of a truncation with the ellipsis message
- Wrap warning message editinginterface into a div with class mw-editinginterface
- (bug 17497) Oasis opendocument added to mime.types
- Remove the link to Special:FileDuplicateSearch from the "file history" section of image description pages as the list of duplicated files is shown in the next section anyway.
- Added $wgRateLimitsExcludedIPs, to allow specific IPs to be whitelisted from rate limits.
- (bug 14981) Shared repositories can now have display names, located at Mediawiki:Shared-repo-name-REPONAME, where REPONAME is the name in $wgForeignFileRepos
- Special:ListUsers: Sort list of usergroups by alphabet
- (bug 16762) Special:Movepage now shows a list of subpages when possible
- (bug 17585) Hide legend on Special:Specialpages from non-privileged users
- Added $wgUseTagFilter to control enabling of filter-by-change-tag
- (bug 17291) MediaWiki:Nocontribs now has an optional $1 parameter for the username
- Wrap special page summary message $specialPageName-summary into a div with class mw-specialpage-summary
- $wgSummarySpamRegex added to handle edit summary spam. This is used *insteadof $wgSpamRegex for edit summary checks. Text checks still use $wgSpamRegex.
- New function to convert content text to specified language (only applies on wiki with LanguageConverter class)
- (bug 17844) Redirect users to a specific page when they log in, see $wgRedirectOnLogin
- Added a link to Special:UserRights on Special:Contributions for privileged users
- (bug 10336) Added new magic word {{REVISIONUSER}}, which displays the editor of the displayed revisions author user name
- LinkerMakeExternalLink now has an $attribs parameter for link attributes and a $linkType parameter for the type of external link being made
- (bug 17785) Dynamic dates surrounded with a tag, fixing sortable tables with dynamic dates.
- (bug 4582) Provide preference-based autoformatting of unlinked dates with the dateformat parser function.
- (bug 17886) Special:Export now allows you to export a whole namespace (limited to 5000 pages)
- (bug 17714) Limited TIFF upload support now built in if tif extension is enabled. Image width and height are now recognized, and when using ImageMagick, optional flattening to PNG or JPEG for inline display can be enabled by setting $wgTiffThumbnailType
- Renamed two input IDs on Special:Log from page and user to mw-log-page and mw-log-user, respectively
- Added $wgInvalidUsernameCharacters to disallow certain characters in usernames during registration (such as "@")
- Added $wgUserrightsInterwikiDelimiter to allow changing the delimiter used in Special:UserRights to denote the user should be searched for on a different database
- Add a class if missingsummary is triggered to allow styling of the summary line
Bug fixes:
- (bug 16968) Special:Upload no longer throws useless warnings.
- (bug 17000) Special:RevisionDelete now checks if the database is locked before trying to delete the edit.
- (bug 16852) padleft and padright now handle multibyte characters correctly
- (bug 17010) maintenance/namespaceDupes.php now add the suffix recursively if the destination page exists
- (bug 17035) Special:Upload now fails gracefully if PHPs file_uploads has been disabled
- Fixing the caching issue by using -{T|xxx}- syntax (only applies on wiki with LanguageConverter class)
- Improving the efficiency by using -{A|xxx}- syntax (only applies on wiki with LanguageConverter class)
- (bug 17054) Added more descriptive errors in Special:RevisionDelete
- (bug 11527) Diff on page with one revision shows "Next" link to same diff
- (bug 8065) Fix summary forcing for new pages
- (bug 10569) redirects to Special:Mypage and Special:Mytalk are no longer allowed by default. Change $wgInvalidRedirectTargets to re-enable.
- (bug 3043) Feed links of given page are now preceded by standard feed icon
- (bug 17150) escapeLike now escapes literal properly
- Inconsistent use of sysop, admin, administrator in system messages changed to administrator
- (bug 14423) Check block flag validity for block logging
- DB transaction and slave-lag avoidance tweaks for Email Notifications
- (bug 17104) Removed [Mark as patrolled] link for already patrolled revisions
- (bug 17106) Added redirect=no and mw-redirect class to redirects at "user contributions"
- Rollback links on new pages removed from "user contributions"
- (bug 15811) Re-upload form tweaks: license fields removed, destination locked, comment label uses better message
- Whole HTML validation ($wgValidateAllHtml) now works with external tidy
- Parser tests no longer fail when $wgExternalLinkTarget is set in LocalSettings
- (bug 15391) catch DBQueryErrors on external storage insertion. This avoids error messages on save were the edit in fact is saved.
- (bug 17184) Remove duplicate "z" accesskey in MonoBook
- Parser tests no longer fail when $wgAlwaysUseTidy is set in LocalSettings.php
- Removed redundant dupe warnings on reupload for the same title. Dupe warnings for identical files at different titles are still given.
- Add change tagging facility, where changes can be tagged internally with certain designations, which are displayed on various summaries of changes, and the entries can be styled with CSS.
- (bug 17207) Fix regression breaking category page display on PHP 5.1
- Categoryfinder utility class no longer fails on invalid input or gives wrong results for category names that include pseudo-namespaces
- (bug 17252) Galician numbering format
- (bug 17146) Fix for UTF-8 and short word search for some possible MySQL configs
- (bug 7480) Internationalize database error message
- (bug 16555) Number of links to mediawiki.org scaled back on post-installation
- (bug 14938) Removing a section no longer leaves excess whitespace
- (bug 17304) Fixed fatal error when thumbnails couldnt be generated for file history
- (bug 17283) Remove double URL escaping in show/hide links for log entries and RevisionDeleteForm:__construct
- (bug 17105) Numeric table sorting broken
- (bug 17231) Transcluding special pages on wikis using language conversion no longer affects the page title
- (bug 6702) Default system messages updated/improved
- (bug 17190) User ID on preference page no longer has delimeters
- (bug 17341) "Powered by MediaWiki" should be on the left on RTL wikis
- (bug 17404) "userrights-interwiki" right was missing in User:$mCoreRights
- (bug 7509) Separation strings should be configurable
- (bug 17420) Send the correct content type from action=raw when the HTML file cache is enabled.
- (bug 12746) Do not allow new password e-mails when wiki is in read-only mode
- (bug 17478) Fixed a PHP Strict standards error in maintenance/cleanupWatchlist.php
- (bug 17488) RSS/Atom links in left toolbar are now localized in classic skin
- (bug 17472) use print