Manual:Configuration settings

This is an index of all supported configuration options based on the  file.

Never edit ; copy appropriate lines to   instead and amend them as appropriate.


 * Listed alphabetically | Listed by function | Category:MediaWiki configuration settings

General Settings

 * $wgProto - The secure server prefix.
 * $wgServer - The base URL of the server.
 * $wgServerName - The name of the server without the protocol. (eg, en.wikipedia.org)
 * $wgSitename - The name of the site. Should be changed
 * $wgVersion - Contains the current version of MediaWiki, as displayed to the user.

Paths

 * $IP - The filesystem installation directory. Not in DefaultSettings.php.
 * $wgActionPaths - Paths for various user actions. Used to 'pretty' URLs.
 * $wgAppleTouchIcon - Optional URL to an icon to use when bookmarking to the home screen on Apple handheld devices.
 * $wgArticlePath - The URL template used to create article links.
 * $wgDirectoryMode - Default value for chmoding of new directories.
 * $wgDiff - Path to the GNU diff utility.
 * $wgDiff3 - Path to the GNU diff3 utility.
 * $wgFavicon - The URL of the site favicon.
 * $wgLogo - The URL of the site logo.
 * $wgPhpCli - Executable name of PHP cli client (php/php5).
 * $wgRedirectScript - The URL of redirect.php, needed for backwards compatibility.
 * $wgScript - The URL of index.php.
 * $wgScriptExtension - Extension to append to script names by default.
 * $wgScriptPath - The base URL path.
 * $wgSQLiteDataDirMode - Default directory mode for SQLite data directory on creation.
 * $wgStockPath (deprecated) - For stock images that come with MediaWiki.
 * $wgStyleSheetDirectory (deprecated) - The file system path of the directory containing the stylesheets.
 * $wgStyleSheetPath - The URL of the directory containing the stylesheets.
 * $wgTmpDirectory - The URL of the temporary directory.
 * $wgUsePathInfo - Whether to use 'pretty' URLs.
 * $wgVariantArticlePath - Used for links when having language's variants.

See also TeX for LaTeX specific path settings.

See also Uploads for file/image upload path settings.

See also Skins for skins path settings.

Global Objects

 * $wgConf - Create a site configuration object. Not used for much in a default install.

Email settings
See Also User Access: $wgEmailConfirmToEdit


 * $wgEmailAuthentication - Whether Email authentication (confirmation) is needed for that wiki for using any Email function (except password reminder which works independently from this setting)
 * $wgEmergencyContact - Site admin email address
 * $wgEnableEmail - Set to true to enable the e-mail basic features: Password reminders, etc.
 * $wgEnableUserEmail - Set to true to enable user-to-user e-mail.
 * $wgNoReplyAddress - Dummy address which should be accepted during mail send action.
 * $wgPasswordSender - Password reminder email address.
 * $wgPasswordReminderResendTime - Minimum time, in hours, which must elapse between password reminder.
 * $wgSMTP - For using a direct (authenticated) SMTP server connection.
 * $wgSysopEmailBans - Allow sysops to ban users from accessing Emailuser.
 * $wgUserEmailUseReplyTo - Should the sending user's email be in a Reply-To header instead of From.

Email notification (Enotif) settings

 * $wgEnotifFromEditor - Email notifications appear to be coming from the page editor (not from Wiki server)
 * $wgEnotifImpersonal - Send a generic mail instead of a personalised mail for each user.
 * $wgEnotifMaxRecips - Maximum number of users to mail at once when using impersonal mail.
 * $wgEnotifMinorEdits - Email notifications also for "minor edits" (user preference is shown and user needs to opt-in)
 * $wgEnotifRevealEditorAddress - reply-to address of Email notifications may be filled with page editor's address (user preference is shown and user needs to opt-in)
 * $wgEnotifUseJobQ - Send mails via the job queue.
 * $wgEnotifUseRealName - Use real name instead of username in e-mail "from" field
 * $wgEnotifUserTalk - Email notifications can be sent for first change on a user_talk page (user preference is shown and user needs to opt-in)
 * $wgEnotifWatchlist - Email notifications can be sent for the first change on watched pages (user preference is shown and user needs to opt-in)
 * $wgUsersNotifiedOnAllChanges (formerly $wgUsersNotifedOnAllChanges!) - Array of usernames who will be sent a notification email for every change which occurs on a wiki

Database settings

 * $wgAllDBsAreLocalhost - Make all database connections secretly go to localhost. Useful for debugging.
 * $wgBufferSQLResults (deprecated) - Use buffered queries by default.
 * $wgCheckDBSchema (deprecated)
 * $wgDBAvgStatusPoll - Time before the server get a SHOW STATUS query under overload conditions.
 * $wgDBconnection - (deprecated)
 * $wgDBerrorLog - File to log database errors to.
 * $wgDBname - Name of the database.
 * $wgDBpassword - The password for $wgDBuser.
 * $wgDBport - Database port.
 * $wgDBprefix - Table name prefix.
 * $wgDBschema - (deprecated) On some databases this allows separate logical namespace for application data.
 * $wgDBserver - Database host name or ip address.
 * $wgDBtype - Type of database.
 * $wgDBuser - Database username.
 * $wgLocalDatabases - Other wikis on this site, can be administered from a single developer account.
 * $wgSearchType - Type of DB search used.
 * $wgSecondaryMessageDB (deprecated) - DB to fall back on if the message isn't in the main DB.
 * $wgSqlLogFile (deprecated)
 * $wgSqlTimeout (deprecated)

LoadBalancer settings

 * $wgAlternateMaster (deprecated) - A map of database name to connection index.
 * $wgDBClusterTimeout - When to give error messages.
 * $wgDBloads (deprecated) - Database load balancer.
 * $wgDBservers - Database load balancer.
 * $wgDefaultExternalStore - The place to put new revisions.
 * $wgLBFactoryConf - Load balancer factory configuration.
 * $wgMasterWaitTimeout - How long to wait for a slave to catch up to the master.
 * $wgSlaveLagCritical - If lag is higher than this value, show a more obvious warning than $wgSlaveLagWarning.
 * $wgSlaveLagWarning - If lag is higher than this value, show a warning in some special pages (like watchlist).

MySQL specific

 * $wgDBminWordLen (deprecated) - Used to discard words that MySQL will not return any results for shorter values configure mysql directly.
 * $wgDBmysql4 (deprecated) - Set to true to use enhanced fulltext search.
 * $wgDBmysql5 - Set to true to set MySQL connection into UTF-8 encoding
 * $wgDBTableOptions - MySQL table options to use during installation or update.
 * $wgDBtransactions - Set to true if using InnoDB tables.
 * $wgExternalServers - An array of external MySQL servers.

PostgreSQL specific

 * $wgDBmwschema - Schema that Postgres stores the MediaWiki tables in. Defaults to 'mediawiki'
 * $wgDBts2schema - Schema that the Tsearch2 tables live in for Postgres. Defaults to 'public'

SQLite specific

 * $wgSQLiteDataDir - To override default SQLite data directory.

Shared DB settings

 * $wgSharedDB - The name of the shared database.
 * $wgSharedPrefix - Prefix to use for the shared database.
 * $wgSharedTables - Tables to use in shared database

Sysop SQL queries
These settings are for sysops to make queries through Extension:Asksql.


 * $wgAllowSysopQueries (deprecated) - Set to allow sysop queries.
 * $wgDBsqlpassword (deprecated) - The password for $wgDBsqluser.
 * $wgDBsqluser (deprecated) - The SQL user used for queries.

Compressed Storage Support

 * $wgCompressRevisions - If this is set on, old revisions will be compressed on page save if zlib support is available.
 * $wgDisableOutputCompression - Disable output compression (compression is enabled by default if zlib is available).

Localization

 * $wgAmericanDates - Enable for English module to print dates as eg 'May 12' instead of '12 May'.
 * $wgDisableLangConversion - Whether to enable language variant conversion.
 * $wgDisableTitleConversion - Whether to enable language variant conversion for links.
 * $wgDocType - The doc type to use in the  declaration.
 * $wgDTD - Specifies the DTD in the DOCTYPE declaration for page output.
 * $wgEditEncoding - Characters not explicitly converted by output encoding
 * $wgForceUIMsgAsContentMsg - Array of UI messages that should be treated as content messages
 * $wgInputEncoding - The encoding of the input text.
 * $wgInterwikiMagic - Treat language links as magic connectors, not inline links.
 * $wgLanguageCode - Site language code. Should be one of the ./language/Language(.*).php files.
 * $wgLanguageFile (deprecated) - Filename of a language file generated by dumpMessages.php.
 * $wgLegacyEncoding - Set this to eg 'ISO-8859-1' to perform character set conversion when loading old revisions not marked with utf-8 flag.
 * $wgLoginLanguageSelector - Show a bar of language selection links in the user login and user registration forms.
 * $wgMsgCacheExpiry - When a message in cache expires (in seconds).
 * $wgOutputEncoding - The encoding of the output text.
 * $wgUseDatabaseMessages - Translation using MediaWiki: namespace.
 * $wgUseDynamicDates - Enable to allow rewriting dates in page text. DOES NOT FORMAT CORRECTLY FOR MOST LANGUAGES.
 * $wgUseLatin1 (deprecated) - Enable ISO-8859-1 compatibility mode.
 * $wgXhtmlDefaultNamespace - Default XHTML namespace
 * $wgXhtmlNamespaces - Permit other namespaces in addition to the w3.org default.

Timezone settings

 * $wgLocaltimezone - Fake out the timezone that the server thinks it's in.
 * $wgLocalTZoffset - Add a distance to the timezone of the server.

Chinese-specific

 * $wgZhdaemonHost - The host which zhdaemon is on. This is only used if $wgUseZhdaemon is set.
 * $wgZhdaemonPort - The port on $wgZhdaemonHost which zhdaemon is on.
 * $wgUseZhdaemon - Whether to use zhdaemon to perform Chinese text processing.

Hindi/Arabic-specific

 * $wgTranslateNumerals - For Hindi and Arabic use local numerals instead of Western style (0-9) numerals in interface.

Debug/logging

 * $wgColorErrors - Whether to color command-line error messages.
 * $wgDebugComments - Include portions of log output in page HTML comment.
 * $wgDebugDumpSql - Dump SQL queries to debug output
 * $wgDebugLogFile - The file name of the debug log, or empty if disabled. wfDebug appends to this file.
 * $wgDebugLogGroups - Selective debug logs on a group basis.
 * $wgDebugLogPrefix - Prefix for debug log lines
 * $wgDebugRawPage - Avoid overlapping debug entries by leaving out CSS.
 * $wgDebugRedirects - Displays redirect location instead of actually redirecting to the target URL
 * $wgIgnoreSQLErrors (deprecated) - Whether to disable automatic generation of "we're sorry, but there has been a database error" pages.
 * $wgJobLogFile (deprecated) - Log file for job execution.
 * $wgLogQueries - enable logging of nquiries; requires Extension AskSql
 * $wgShowDebug - Display debug data at the bottom of the main content area.
 * $wgShowSQLErrors - Whether to show "We're sorry, but there has been a database error." pages.
 * $wgShowExceptionDetails - If set to true, uncaught exceptions will print a complete stack trace to output.
 * $wgStatsMethod - Destination for wfIncrStats data.

Profiling

 * $wgDebugFunctionEntry - Output debug message on every wfProfileIn/wfProfileOut
 * $wgDebugProfiling - Detects non-matching wfProfileIn/wfProfileOut calls
 * $wgDebugSquid - Lots of debugging output from SquidUpdate.php
 * $wgProfileCallTree - If true, print a raw call tree instead of per-function report
 * $wgProfileLimit - Only record profiling info for pages that took longer than this
 * $wgProfileOnly - Don't put non-profiling info into log file
 * $wgProfilePerHost - Should application server host be put into profiling table?
 * $wgProfilerType (deprecated) - If not empty, specifies profiler type to load.
 * $wgProfileSampleRate (deprecated) - Only profile every n requests when profiling is turned on
 * $wgProfileToCommentUser (deprecated) - Put profiling data in HTML comments in the output file, for a given user only.
 * $wgProfileToDatabase - Log sums from profiling into profiling table in db.
 * $wgProfiling (deprecated) - Enable for more detailed by-function times in debug log
 * $wgUDPProfilerHost - Host for UDP profiler.
 * $wgUDPProfilerPort - Port for UDP profiler.

Site customization

 * $wgBreakFrames - Break out of framesets. This can be used to prevent external sites from framing your site.
 * $wgCapitalLinks - Set this to false to avoid forcing the first letter of links to capitals.
 * $wgDefaultLanguageVariant - Default variant code, if false, the default will be the language code.
 * $wgExtraLanguageNames - List of language names or overrides for default names in Names.php.
 * $wgExtraRandompageSQL - Filter for Special:Randompage. Part of a WHERE clause.
 * $wgExtraSubtitle - The subtitle to appear under every title.
 * $wgHideInterlanguageLinks - Hide interlanguage links from the sidebar.
 * $wgLegalTitleChars - Override default list of illegal characters in page titles.
 * $wgMaxArticleSize - Maximum article size in kilobytes.
 * $wgMaxRedirects - Max number of redirects to follow when resolving redirects.
 * $wgMetadataWhitelist - Full name of the page containing templates names that will be allowed as metadata.
 * $wgNavigationLinks (deprecated) - Navigation links for the user sidebar.
 * $wgNoFollowDomainExceptions - External links to these domain names (or any subdomains) will not be set to
 * $wgNoFollowLinks - If true, external URL links in wiki text will be given the  attribute.
 * $wgPageShowWatchingUsers - Show watching users in Page views.
 * $wgRestrictionLevels - Set of permission keys that can be selected on the 'page protection' page.
 * $wgSiteNotice - A message to be displayed at the top of every page.
 * $wgSiteSupportPage - A page where your users can donate.
 * $wgStyleVersion - Appended in the query string of static CSS and JS to clear client side cache when changing this.
 * $wgUniversalEditButton - Enable the UniversalEditButton for browsers that support it
 * $wgUrlProtocols - Defines the protocols which are supported and translated in HTML by the MediaWiki parser.
 * $wgUseExternalEditor - Activate external editor interface for files and pages.
 * $wgUseMetadataEdit - Whether to use metadata edition.

Ajax

 * $wgAjaxExportList - List of functions in  that are callable via
 * $wgAjaxSearch (deprecated) - Enable use of AJAX auto-suggestion for the search bar.
 * $wgAjaxUploadDestCheck - Enable AJAX check for file overwrite, pre-upload.
 * $wgAjaxWatch - Enable watching/unwatching pages using AJAX.
 * $wgUseAjax - Enable use of AJAX features

CSS/Js

 * $wgAllowUserCss - Allow user Cascading Style Sheets (CSS)
 * $wgAllowUserJs - Allow user Javascript pages
 * $wgForcedRawSMaxage - Default maximum age for raw CSS/JS accesses.
 * $wgHandheldForIPhone - If set, 'screen' and 'handheld' media also apply to the iPhone/iPod Touch Mobile Safari.
 * $wgHandheldStyle - Style for media="handled".
 * $wgUseSiteCss - Use the site's Cascading Style Sheets (CSS).
 * $wgUseSiteJs - Use the site's Javascript page.

Namespaces

 * $wgContentNamespaces - Namespaces which are considered to contain real content, or articles
 * $wgExtraNamespaces - Additional namespaces.
 * $wgMetaNamespace - The name used for the meta-namespace.
 * $wgMetaNamespaceTalk - The name used for the meta-namespace talk pages.
 * $wgNamespaceAliases - override the default names for namespaces.
 * $wgNamespaceProtection - default protection levels for namespaces.
 * $wgNamespacesToBeSearchedDefault - Which namespaces should be searched?
 * $wgNamespacesToBeSearchedProject - Additional namespaces that will be added to default search for "project"
 * $wgNamespacesWithSubpages - Which namespaces should support subpages?
 * $wgNoFollowNsExceptions - Namespaces where the nofollow setting ($wgNoFollowLinks) is overridden.
 * $wgNonincludableNamespaces - Pages in namespaces in this array can not be used as templates.
 * $wgSitemapNamespaces - Array of namespaces to generate a sitemap or false for all namespaces.

Robot policies

 * $wgArticleRobotPolicies - Allow customisation of robot policies on a per-article basis.
 * $wgDefaultRobotPolicy - Default robot exclusion policy for the wiki.
 * $wgExemptFromUserRobotsControl - An array of namespace keys in which the __INDEX__/__NOINDEX__ magic words will not function.
 * $wgNamespaceRobotPolicies - Allow customisation of robot policies on a per-namespace basis.

Site Statistics

 * $wgCountCategorizedImagesAsUsed - On Special:Unusedimages, consider images used if they are put into a category.
 * $wgDisableCounters - Disable view counter shown in the footer of an article/page as: "This page has been accessed X times"
 * $wgHitcounterUpdateFreq - Sets how often page counters should be updated.
 * $wgUseCommaCount - Specifies the criteria used to define a 'valid article' when counting.
 * $wgWantedPagesThreshold - Minimum number of links required before a page is listed on Special:Wantedpages

Skins

 * $wgDefaultSkin - The default skin.
 * $wgSkipSkin - Specify the name of a skin that should not be presented in the list of available skins.
 * $wgSkipSkins - More of the same as $wgSkipSkin.
 * $wgStyleDirectory - The file system path to the skins directory.
 * $wgStylePath - The URL of the skins directory.
 * $wgUsePHPTal (deprecated)
 * $wgValidSkinNames - List of valid skin names.

Category

 * $wgUseCategoryMagic (deprecated) - Should the category pseudo-namespace be used?
 * $wgCategoryMagicGallery - On category pages, show thumbnail gallery for images belonging to that category instead of listing them as articles.
 * $wgCategoryPagingLimit - Paging limit for items in categories.
 * $wgUseCategoryBrowser - Enable DMOZ-like category tree at the bottom of pages
 * $wgCategoryPrefixedDefaultSortkey - Apply/remove page prefix (namespace name) at default category sortkey

Cache

 * $wgCacheEpoch - Set this to current time to invalidate all prior cached pages.
 * $wgCheckSerialized - Check if serialised files are up to date.
 * $wgClockSkewFudge - Helps avoid cache problems due to timer resolution.
 * $wgImageHtmlCacheExpiry (deprecated) - Set to a number of seconds to cache the HTML associated with an image.
 * $wgMainCacheType - Replaces $wgUseMemCached.
 * $wgQueryCacheLimit - Number of rows to cache in 'querycache' table when miser mode is on.
 * $wgRevisionCacheExpiry - Cache extracted revision text in MemCached.
 * $wgThumbnailEpoch - If rendered thumbnail files are older than this timestamp, they will be rerendered on demand as if the file didn't already exist.
 * $wgUseETag - Whether MediaWiki should send an ETag header.
 * $wgUseGzip - Use GZip to store cached pages.
 * $wgUpdateRowsPerQuery - Number of rows to update per query.
 * $wgUseWatchlistCache (deprecated) - Generate a watchlist once every hour or so.
 * $wgWLCacheTimeout (deprecated) - The hour or so mentioned above.

See Interwiki for Interwiki cache settings.

Client side caching

 * $wgCachePages - Allow client-side caching of pages

File Cache
Setting for Server side file caching
 * $wgFileCacheDirectory - Directory where the cached page will be saved when using server-side caching.
 * $wgUseFileCache - This will cache static pages for non-logged-in users to reduce database traffic on public sites.

Message Cache

 * $wgCachedMessageArrays (deprecated) - Directory for compiled constant message array databases.
 * $wgEnableSerializedMessages - Whether serialized versions of the messages arrays will be read from the 'serialized' subdirectory if they are present.
 * $wgLocalMessageCache - Directory for local copy of message cache, for use in addition to memcached.
 * $wgLocalMessageCacheSerialized - Defines format of local cache.
 * $wgMaxMsgCacheEntrySize - Maximum entry size in the message cache, in bytes.
 * $wgMessageCacheType - Message cache setting.
 * $wgPartialMessageCache (deprecated)

Sidebar Cache

 * $wgEnableSidebarCache - If true, cache the sidebar navigation links.
 * $wgSidebarCacheExpiry - Expiry time for the sidebar cache.

Parser Cache

 * $wgEnableParserCache - Keep parsed pages in a cache (objectcache table, turck, or memcached) to speed up output of the same page viewed by another user with the same options.
 * $wgRenderHashAppend - Append a configured value to the parser cache and the sitenotice cache keys.
 * $wgParserCacheExpireTime - Expiration time (in seconds) of cached parser information
 * $wgParserCacheType - Parser cache setting.

Persistent Link Cache

 * $wgCompressedPersistentLC (deprecated) - Use gzcompressed blobs.
 * $wgEnablePersistentLC (deprecated)

Memcached settings
Settings for configuring the Memcached memory-based object store (if you are using it) docs/memcached.txt has more details.
 * $wgUseMemCached (deprecated) - Use memcache, using the servers set in $wgMemCachedServers.
 * $wgLinkCacheMemcached (deprecated) - Cache links using object cache setting (memcache, Turck MMCache, eAccelerator, etc.)
 * $wgMemCachedDebug - Will be set to false in Setup.php, if the server isn't working.
 * $wgMemCachedPersistent - Whether to use persistent memcached connections.
 * $wgMemCachedServers - Array of Memcached servers.
 * $wgSessionsInMemcached - Store sessions in memcached instead of the default PHP behaviour.
 * $wgUseEAccelShm (deprecated) - You can use this for persistent caching where your wiki runs on a single server. Use eAccelerator for shared memory.
 * $wgUseTurckShm (deprecated) - Use Turck MMCache shared memory.

Interwiki

 * $wgDisableHardRedirects - Disable redirects to special pages and interwiki redirects, which use a 302 and have no redirected from link.
 * $wgEnableScaryTranscluding - Enable scary transclusion (transcluding from another wiki)
 * $wgImportSources - List of interwiki prefixes for wikis we'll accept as sources for Special:Import (for sysops).
 * $wgLocalInterwiki - The Interwiki prefix of this wiki. It should always be changed in LocalSettings.php.
 * $wgRedirectSources - Regular expression to restrict URLs which will be displayed as 'redirected from' links.
 * $wgTranscludeCacheExpiry - Expiry time for interwiki transclusion.

Interwiki cache

 * $wgInterwikiCache -- Whether to enable the interwiki cache.
 * $wgInterwikiExpiry - Expiry time for cache of interwiki table.
 * $wgInterwikiFallbackSite - Used by maintenance scripts to dump interwiki table.
 * $wgInterwikiScopes - Used by getInterwikiCache to retreive from interwiki database file.

Access
Wiki locking, blocking/banning, and some other related settings.


 * $wgAutopromote - Conditions of automatic promotion of user to specific groups.
 * $wgAccountCreationThrottle - Number of accounts each IP address may create, 0 to disable. Requires memcached.
 * $wgAllowPageInfo - Allow the info action, very inefficient at the moment.
 * $wgDeleteRevisionsLimit - Integer of how many revisions an article must have before the bigdelete right is required to delete it.
 * $wgDisabledActions - Array of disabled article actions, e.g. view, edit, dublincore, delete, etc.
 * $wgEnableCascadingProtection - Enable cascade protection.
 * $wgFilterCallback - Similarly (to $wgSpamRegex) if this function returns true.
 * $wgIPBlockExpiration (deprecated) - IP blocks expire after this many seconds
 * $wgNewPasswordExpiry - The time, in seconds, when an emailed temporary password expires.
 * $wgPasswordAttemptThrottle - Limit password attempts per IP per address.
 * $wgPasswordSalt - For compatibility with old installations set to false.
 * $wgRestrictionTypes - Actions that can be restricted.
 * $wgSpamRegex - A regular expression pattern which stops a page from being saved.
 * $wgSummarySpamRegex - Same as $wgSpamRegex except for edit summaries
 * $wgSysopRangeBans - Allow sysops to ban IP ranges

See Manual:Preventing access for more methods and settings concerning access. See also Manual:User rights management for more information about $wgGroupPermissions, $wgAddGroups, $wgRemoveGroups, etc.

See User Access for User Access settings.

Rate limiter

 * $wgRateLimitLog - Set to a filename to log rate limiter hits.
 * $wgRateLimits - Simple rate limiter options to brake edit floods.
 * $wgRateLimitsExcludedGroups - Array of groups which should never trigger the rate limiter.

API

 * $wgEnableAPI - Enable direct access to the data API through api.php.
 * $wgEnableWriteAPI - Allow the API to be used to perform write operations (page edits, rollback, etc.) when an authorised user accesses it.

Wiki locking

 * $wgReadOnly - Disallows editing, displaying the string given as the reason.
 * $wgReadOnlyFile - If this file is found, the database is locked for the reason given in the contents of the file.

Reduction

 * $wgAPIMaxDBRows - Maximum amount of rows to scan in a DB query in the API.
 * $wgAPIMaxResultSize - The maximum size (in bytes) of an API result.
 * $wgAPIMaxUncachedDiffs - The maximum number of uncached diffs that can be retrieved in one API request.
 * $wgDisableFuzzySearch (deprecated)
 * $wgDisableQueryPages - Disable all query pages if miser mode is on, not just some.
 * $wgDisableQueryPageUpdate - Array of special pages that should not be updated.
 * $wgDisableSearchContext - Setting this 'false' enables display of additional information on specific date/page revisions in search results. Requires Extension:LuceneSearch
 * $wgDisableSearchUpdate - If you've disabled search semi-permanently, this also disables updates to the table.
 * $wgDisableTextSearch - Disables full text search (including title search).
 * $wgEdititis - Display user edit counts in various prominent places.
 * $wgFixDoubleRedirects - Fix double redirects after a page move.
 * $wgInvalidRedirectTargets - Array of invalid page redirect targets.
 * $wgMaximumMovedPages - Maximum number of pages to move at once when moving subpages with a page.
 * $wgMiserMode - If true, disable database-intensive features
 * $wgShowHostnames - If set to true, exposes host names through API and HTML comments.
 * $wgUseDumbLinkUpdate - Do /  for link updates instead of incremental.

Uploads
Uploads have to be specially set up to be secure.


 * $wgAjaxLicensePreview - Allow preview licences during upload via AJAX.
 * $wgAllowCopyUploads - allow uploads from URLs, not just local files
 * $wgCheckFileExtensions - This is a flag to determine whether or not to check file extensions on upload.
 * $wgEnableUploads - Enables uploads and shows link to upload page
 * $wgDisableUploads (deprecated) - Does opposite of $wgEnableUploads
 * $wgFileBlacklist - Files with these extensions will never be allowed as uploads.
 * $wgFileExtensions - This is the list of preferred extensions for uploading files. Uploading files with extensions not in this list will trigger a warning.
 * $wgFileStore - Indicates where deleted images are to be stored.
 * $wgHashedUploadDirectory - If true, use the /a/ab/foo.png directory structure.
 * $wgHTTPTimeout - Timeout for HTTP requests done via CURL.
 * $wgHTTPProxy - Proxy to use for CURL requests.
 * $wgLocalFileRepo - A single repository structure for the local repository.
 * $wgRemoteUploads - Set to true to enable the upload link while local uploads are disabled.
 * $wgStrictFileExtensions - If this is turned off, users may override the warning for files not covered by $wgFileExtensions.
 * $wgUploadBaseUrl - The base URL for uploaded images if shared upload directory isn't to be used
 * $wgUploadDirectory - The file system path of the upload directory.
 * $wgUploadNavigationUrl - Point the upload navigation link to an external URL.
 * $wgUploadPath - The URL of the upload directory.
 * $wgUploadSizeWarning - Warn if uploaded files are larger than this.
 * $wgMaxUploadSize - Maximum size for file uploads.
 * $wgSaveDeletedFiles (deprecated) - Indicates that deleted images are to be stored for later undeletion.

Shared uploads
These settings are kept for backward compatibility, see $wgForeignFileRepos for the new setting.
 * $wgCacheSharedUploads - Cache shared metadata in memcached.
 * $wgForeignFileRepos - An array of repository structure for foreigns repositories.
 * $wgHashedSharedUploadDirectory - Whether to hash the shared upload directory.
 * $wgRepositoryBaseUrl - Base URL for a repository wiki.
 * $wgSharedLatin1 (deprecated) - set true if the repository uses latin1 filenames.
 * $wgSharedUploadDBname - DB name with metadata about shared directory.
 * $wgSharedUploadDBprefix - DB prefix for shared image uploads.
 * $wgSharedUploadDirectory - Path on the file system where shared uploads can be found.
 * $wgSharedUploadPath - Full path on the web server where shared uploads can be found.
 * $wgUseSharedUploads - Whether to look in the shared repository if no file of the given name is found in the local repository (for [[Image:..]], [[Media:..]] links).
 * $wgFetchCommonsDescriptions - set this "true" if you want to integrate media-descriptions, stored in the commonswiki

MIME types

 * $wgJsMimeType - Media type (MIME type) to use for JavaScript scripts.
 * $wgLoadFileinfoExtension - Switch for loading the FileInfo extension by PECL at runtime.
 * $wgMimeDetectorCommand - Sets an external mime detector program.
 * $wgMimeInfoFile - Sets the mime type info file to use by MimeMagic.php.
 * $wgMimeType - The type to send in the  header.
 * $wgMimeTypeFile - Sets the mime type definition file to use by MimeMagic.php.
 * $wgTrivialMimeDetection - Switch for trivial mime detection.
 * This is not a configuration setting, but a global state variable. It should be used solely by thumb.php!


 * $wgVerifyMimeType - Determines if the mime type of uploaded files should be checked
 * $wgMimeTypeBlacklist - Files with these mime types will never be allowed as uploads if $wgVerifyMimeType is enabled.
 * $wgXMLMimeTypes - An array of XML mime types we can detect via MimeMagic.

See also Manual:Mime type detection

Images

 * $wgAllowImageMoving - Allow to move images, experimental
 * $wgCustomConvertCommand - Use another resizing converter, e.g. GraphicMagick.
 * $wgFileRedirects (deprecated) - If enabled, MediaWiki checks redirects in Image: namespace.
 * $wgIgnoreImageErrors - If true, inline scaled images will still produce tags ready for output instead of showing an error message.
 * $wgImageLimits - Limit images on image description pages to a user-selectable limit.
 * $wgMaxImageArea - Don't thumbnail an image if it will use too much working memory.
 * $wgMaxTemplateDepth - Maximum recursion depth for templates within templates.
 * $wgMediaHandlers - Plugins for media file type handling.
 * $wgUseImageResize - Set $wgUseImageResize to true if you want to enable dynamic server side image resizing (Thumbnails)
 * parameters for upload path
 * $wgTrustedMediaFormats - List of trusted media-types and mime types.

See also Manual:Configuring file uploads

DjVu

 * $wgDjvuDump - Path of the djvudump executable.
 * $wgDjvuOutputExtension - File extension for the DJVU post processor output.
 * $wgDjvuPostProcessor - Path of the DJVU post processor.
 * $wgDjvuRenderer - Path of the ddjvu DJVU renderer.
 * $wgDjvuToXML - Path of the djvutoxml executable.

EXIF

 * $wgShowEXIF - Determines whether EXIF metadata is to be displayed. Set to false for not showing data.

ImageMagick
Set $wgUseImageMagick to true to use ImageMagick instead of the builtin functions.
 * $wgImageMagickConvertCommand - Set to the command used to evoke ImageMagick.
 * $wgImageMagickTempDir - Temporary directory used for ImageMagick.
 * $wgSharpenParameter - Sharpening parameter to ImageMagick.
 * $wgSharpenReductionThreshold - Reduction in linear dimensions below which sharpening will be enabled.
 * $wgUseImageMagick - Resizing can be done using PHP's internal image libraries or using ImageMagick. The latter supports more file formats than PHP, which only supports PNG, GIF, JPG, XBM and WBMP.

SVG

 * $wgAllowTitlesInSVG - If true, will be allowed in files with an "image/svg" MIME type.
 * $wgSVGConverter - A key from $wgSVGConverters to use as converter.
 * $wgSVGConverterPath - If not in the executable PATH, specify.
 * $wgSVGConverters - Scalable Vector Graphics (SVG) may be uploaded as images.
 * $wgSVGMaxSize - Don't scale a SVG larger than this unless its native size is larger.

Thumbnail settings

 * $wgGenerateThumbnailOnParse - Allow thumbnail rendering on page view.
 * $wgMaxAnimatedGifArea - Force thumbnailing of animated GIFs above this size to a single frame instead of an animated thumbnail.
 * $wgSharedThumbnailScriptPath - Same as $wgThumbnailScriptPath, but for shared uploads.
 * $wgTiffThumbnailType - Array of extension and mime type to transform TIFF images to.
 * $wgThumbnailScriptPath - Give a path here to use thumb.php for thumbnail generation on client request, instead of generating them on render and outputting a static URL.
 * $wgThumbUpright - Adjust width of upright images when parameter 'upright' is used
 * $wgThumbLimits - List of image sizes users can pick from

Antivirus

 * $wgAntivirus - Internal name of virus scanner.
 * $wgAntivirusRequired - Determines if a failed virus scan will cause the file to be rejected.
 * $wgAntivirusSetup - Configuration for different virus scanners.

Parser

 * $wgAllowDisplayTitle - Allow the magic word   to override  the title of a page.
 * $wgAllowExternalImages - Whether to allow inline image pointing to other websites.
 * $wgAllowExternalImagesFrom - If $wgAllowExternalImages is false, you can specify exceptions here.
 * $wgEnableImageWhitelist - If $wgAllowExternalImages is false, this will enable an on-wiki image whitelist at MediaWiki:External image whitelist.
 * $wgCleanSignatures - If true, removes (substitutes) templates in " ~ " signatures.
 * $wgEnforceHtmlIds - Allow id's that don't conform to HTML4 backward compatibility requirements.
 * $wgExpensiveParserFunctionLimit - Maximum number of calls per parse to expensive parser functions such as PAGESINCATEGORY.
 * $wgExternalLinkTarget - Set a default target for external links.
 * $wgGrammarForms - Used for parser function.
 * $wgLinkHolderBatchSize - LinkHolderArray batch size.
 * $wgMaxPPExpandDepth - Stack depth limit for expansion with the preprocessor.
 * $wgMaxPPNodeCount - A complexity limit on template expansion.
 * $wgMaxTemplateDepth - Maximum recursion depth for templates within templates.
 * $wgMaxTocLevel - Maximum indent level of toc.
 * $wgParserConf - Parser configuration.
 * $wgParserTestFiles - Parser test suite files to be run by parserTests.php.
 * $wgPreprocessorCacheThreshold - Preprocessor caching threshold.
 * $wgRestrictDisplayTitle - Restrict DISPLAYTITLE to titles that normalize to the same canonical DB key.
 * $wgUseXMLparser (deprecated) - Use XML parser?

HTML

 * $wgMakeDumpLinks (deprecated) - Produce hashed HTML article paths.
 * $wgRawHtml - Allow raw, unchecked HTML in ... sections.
 * $wgUserHtml (deprecated) - Allow limited user-specified HTML in wiki pages?

TeX
To use inline TeX, you need to compile 'texvc' (in the 'math' subdirectory of the MediaWiki package and have latex, dvips, gs (ghostscript), and convert (ImageMagick) installed and available in the PATH. Please see math/README for more information.
 * $wgMathDirectory - The file system path of the directory containing LaTeX math images.
 * $wgMathPath - The URL base of the directory containing LaTeX math images.
 * $wgTexvc - Location of the texvc binary.
 * $wgUseTeX - Enables the use of (TeX) tags.

Tidy
Tidy is an open source tool that cleans up broken HTML. You can use this to ensure that broken HTML in articles doesn't affect the layout of your wiki.


 * $wgAlwaysUseTidy
 * $wgDebugTidy - Put tidy warnings in HTML comments, only works for internal tidy.
 * $wgTidyBin - Should be set to the path of the tidy binary.
 * $wgTidyConf - Should be set to the path of the tidy configuration file.
 * $wgTidyInternal - Controls the use of the PECL extension to use an inprocess tidy library instead of spawning a separate program.
 * $wgTidyOpts - Options passed to tidy on the command line.
 * $wgUseTidy - Use tidy to make sure HTML output is sane.
 * $wgValidateAllHtml - Validate the overall output using tidy and refuse to display the page if it's not valid.

See also Manual:Build Tidy from source.

Special pages

 * $wgAllowSpecialInclusion - Allow special page inclusions such as.
 * $wgExportAllowHistory - Enable the full-history option on Special:Export.
 * $wgExportAllowListContributors
 * $wgExportFromNamespaces - Whether to allow the "export all pages in namespace" option
 * $wgExportMaxHistory - Special:Export requests for history of pages with more revisions than this will be rejected.
 * $wgExportMaxLinkDepth - Maximum value of the "pagelink-depth" parameter in Special:Export.
 * $wgFilterLogTypes - Show/hide links on Special:Log will be shown for these log types
 * $wgFilterRobotsWL (deprecated) - Enable filtering of robots in Special:Watchlist.
 * $wgImportTargetNamespace - Optional default target namespace for interwiki imports.
 * $wgLogActions - Lists the message key string for formatting individual events of each type and action when listed in the logs.
 * $wgLogActionsHandlers - Same as $wgLogActions, but values are functions callbacks.
 * $wgLogHeaders - Lists the message key string for descriptive text to be shown at the op of each log type.
 * $wgLogNames - Lists the message key string for each log type.
 * $wgLogRestrictions - Restricts log access to those who have a certain right.
 * $wgLogTypes - List of log types.
 * $wgMaxRedirectLinksRetrieved - Maximum number of links to a redirect page listed on Special:Whatlinkshere/RedirectDestination.
 * $wgRedirectOnLogin - Redirect a user to a specific page when they log in.
 * $wgSortSpecialPages - Whether or not to sort special pages in Special:Specialpages.
 * $wgSpecialPageGroups - List of special pages, followed by what subtitle they should go under at Special:SpecialPages
 * $wgSpecialVersionShowHooks - Whether to show the contents of $wgHooks in Special:Version.
 * $wgUseNPPatrol - Use new pages patrolling to check for vandalism.

Recent changes
See Special:Recentchanges


 * $wgAllowCategorizedRecentChanges - Allow to filter the recentchanges by a category or one of its sub(subsubsub...)categories
 * $wgPutIPinRC - Log IP addresses in the recentchanges table.
 * $wgRCChangedSizeThreshold - Highlight character count difference lower than this.
 * $wgRCFilterByAge - Filter $wgRCLinkDays to avoid showing links for values higher than $wgRCMaxAge.
 * $wgRCLinkLimits - Changes limit.
 * $wgRCLinkDays - Days limit.
 * $wgRCMaxAge - Recentchanges items are periodically purged; entries older than this many seconds will go.
 * $wgRCSeconds (deprecated) - Show seconds in Recent Changes.
 * $wgRCShowChangedSize - Show the amount of changed characters in recent changes.
 * $wgRCShowWatchingUsers - Show watching users in recent changes, watchlist and page history views.
 * $wgShowUpdatedMarker - Show "Updated (since my last visit)" marker in RC view, watchlist and history.
 * $wgUseRCPatrol - Use RC Patrolling to check for vandalism.

UDP updates
Send RC updates via UDP. See: Manual:Simple IRC RC Bot


 * $wgRC2UDPAddress -Address used.
 * $wgRC2UDPInterwikiPrefix - Whether to prefixes the page name used in the RC feed.
 * $wgRC2UDPOmitBots - Omit bot.
 * $wgRC2UDPPort - Port used.
 * $wgRC2UDPPrefix Prefix used.

Users

 * $wgActiveUserEditCount - The number of edits a person must make to be considered an "active" user
 * $wgActiveUserDays - The number of days a person must make edits to be considered an "active" user
 * $wgAutoConfirmAge - Number of seconds an account is required to age before it's given the implicit 'autoconfirm' group membership.
 * $wgAutoConfirmCount - Number of edits an account requires before it's given the implicit 'autoconfirm' group membership.
 * $wgAllowRealName - Whether or not to allow real name fields.
 * $wgAllowUserSkin - Whether to allow users to select their own skin.
 * $wgDefaultUserOptions - Settings added to this array will override the default settings for the user preferences used by anonymous visitors and newly created accounts.
 * $wgDisableAnonTalk - Disable talk pages for anonymous users (IPs).
 * $wgMaxNameChars - Maximum number of bytes in username.
 * $wgMaxSigChars - Maximum customized signature length.
 * $wgMinimalPasswordLength - Specifies the minimal length of a user password.
 * $wgNewUserLog - Whether to maintain a log of newusers at Special:Log/newusers.
 * $wgReservedUsernames - List of account names that cannot exist.
 * $wgShowIPinHeader - Show the IP in the user bar for anonymous users by default.

User Access

 * $wgAddGroups - Controls who can add specific groups using Special:Userrights.
 * $wgAllowAnonymousMinor (deprecated) - Allow anonymous users to mark changes as 'minor'.
 * $wgAutoblockExpiry - Number of seconds before autoblock entries expire.
 * $wgBlockAllowsUTEdit - Allow blocked users to edit their talk pages.
 * $wgDefaultBlockExpiry (deprecated) - Default expiry time in strtotime format, or infinite for an infinite block.
 * $wgEmailConfirmToEdit - Require users to confirm email address before they can edit, true to enable.
 * $wgGroupPermissions - Use this to set access rights for groups and users. See also Manual:User rights and Manual:User rights management
 * $wgGroupsAddToSelf - allow users to add themselves from specified groups via Special:Userrights
 * $wgGroupsRemoveFromSelf - allow users to remove themselves from specified groups via Special:Userrights
 * $wgImplicitGroups - Array of groups that aren't shown on e.g. Special:Listusers.
 * $wgRemoveGroups - Controls who can remove specific groups using Special:Userrights.
 * $wgSysopUserBans - Allow sysops to ban logged-in users
 * $wgWhitelistAccount (deprecated) - Types of accounts that can create new users.
 * $wgWhitelistEdit (deprecated) - If true, users must login to edit. (versions 1.4 and previous)
 * $wgWhitelistRead - Pages anonymous user may see.

User agent

 * $wgBadRanges (deprecated) - An array of arrays of IP addresses that each value in $wgBadUserAgents apply to.
 * $wgBadUserAgents (deprecated) - Array of user agents that should be automatically blocked.
 * $wgBrowserBlackList - Browser Blacklist for unicode non compliant browsers.
 * $wgRangeBlockReason (deprecated) - This reason is given for the range block.
 * $wgRangeBlockUser (deprecated) - The block is attributed to this user ID.

Cookies

 * $wgCacheVaryCookies - A list of cookies that vary the cache.
 * $wgCookieDomain - Set to set an explicit domain on the login cookies.
 * $wgCookieExpiration - Number of seconds before HTTP cookies expire.
 * $wgCookieHttpOnly - Set authentication cookies to httpOnly to prevent stealing by JS, in browsers that support this feature.
 * $wgCookiePath - Explicitly declared "path" for cookies at the cookie domain.
 * $wgCookiePrefix - Custom cookie prefix.
 * $wgCookieSecure - Whether cookies are secured.
 * $wgDisableCookieCheck - Disables session cookies.
 * $wgHttpOnlyBlacklist - User agent blacklist for HttpOnly mode.
 * $wgSessionName - Override to customise the session name.

Feed

 * $wgFeed - Toggle syndication feeds on and off.
 * $wgFeedCacheTimeout - 'Minimum' timeout for cached Recentchanges feed, in seconds.
 * $wgFeedDiffCutoff - When generating Recentchanges RSS/Atom feed, diffs will not be generated for pages larger than this size.
 * $wgFeedLimit - Set maximum number of results to return in syndication feeds (RSS, Atom) for eg Recentchanges, Newpages.
 * $wgOverrideSiteFeed - Override the site's default rss/atom feed that appears on every page.

Copyright

 * $wgCheckCopyrightUpload - Set this to false if you want to disable checking that detailed copyright information values are not empty.
 * $wgCopyrightIcon - Set this to some HTML to override the copyrights icon with an arbitrary logo.
 * $wgEnableCreativeCommonsRdf - Includes licensing information derived from Creative Commons licenses.
 * $wgEnableDublinCoreRdf - Use RDF metadata
 * $wgMaxCredits - Set this to the number of authors that you want to be credited below an article text.
 * $wgRightsIcon - Copyright icon
 * $wgRightsPage - Page describing the site license
 * $wgRightsText - Text describing the site license
 * $wgRightsUrl - URL describing the site license
 * $wgShowCreditsIfMax - If there are more than $wgMaxCredits authors, show $wgMaxCredits of them.
 * $wgUseCopyrightUpload - Set this to true if you want detailed copyright information forms on Upload.

Search

 * $wgAdvancedSearchHighlighting - Set to true to have nicer highlighted text in search results.
 * $wgEnableMWSuggest - Enable suggestions while typing in search boxes.
 * $wgGoToEdit - Go button goes straight to the edit screen if the article doesn't exist.
 * $wgMWSuggestTemplate - Template for internal MediaWiki suggestion engine.
 * $wgOpenSearchTemplate - Template for OpenSearch suggestions.
 * $wgSearchForwardUrl - Set this to a URL to forward search requests to some external location.
 * $wgSearchHighlightBoundaries - Regexp to match word boundaries.
 * $wgUseTwoButtonsSearchForm - Sidebar's search form behavior

Jobs

 * $wgJobRunRate - Speed of the background task job queue (e.g. update of links).
 * $wgJobClasses - Maps jobs to their handling classes.
 * $wgUpdateRowsPerJob - Number of rows to update per job.

Proxies

 * $wgBlockOpenProxies - Automatic open proxy test on edit.
 * $wgEnableOpm (deprecated) - Use opm.blitzed.org to check for open proxies. Not yet actually used.
 * $wgEnableSorbs - Use http.dnsbl.sorbs.net to check for open proxies.
 * $wgProxyKey (deprecated) - Replaced by $wgSecretKey.
 * $wgProxyList - Big list of banned IP addresses.
 * $wgProxyMemcExpiry - expiration time for cached proxy IPs.
 * $wgProxyPorts - Ports we want to scan for a proxy.
 * $wgProxyScriptPath - Script used to scan for proxies.
 * $wgProxyWhitelist - Proxy whitelist, list of addresses that are assumed to be non-proxy despite what the other methods might say
 * $wgSecretKey - This should always be customised in LocalSettings.php
 * $wgSorbsUrl - URL to the Sorbs blacklist.
 * $wgUsePrivateIPs - Whether forwarded private IPs should be accepted.

Squid

 * $wgInternalServer - Internal server name as known to Squid, if different.
 * $wgMaxSquidPurgeTitles - Maximum number of titles to purge in any one client operation
 * $wgSquidFastPurge (deprecated) - When purging, use persistent connections and don't wait for the response.
 * $wgSquidMaxage - Cache timeout for the squid.
 * $wgSquidServers - A list of proxy servers (ips if possible) to purge on changes.
 * $wgSquidServersNoPurge - Same as $wgSquidServers, except they aren't purged.
 * $wgUseESI - If you run Squid3 with ESI support, enable this.
 * $wgUseSquid - Enable/disable Squid.

HTCP multicast purging

 * $wgHTCPMulticastAddress - Address to use for HTCP multicast purging
 * $wgHTCPMulticastTTL - TTL for HTCP multicast purging
 * $wgHTCPPort - Port for HTCP multicast purging

Extensions

 * $wgAllowSlowParserFunctions - Allow other parser functions like "pagesinnamespace".
 * $wgAPIListModules - API list module extensions.
 * $wgAPIMetaModules - API meta module extensions.
 * $wgAPIModules - API module extensions.
 * $wgAPIPropModules - API prop module extensions.
 * $wgAuth - Authentication plugin. See AuthPlugin.php.
 * $wgAutoloadClasses - Array mapping class names to filenames, for autoloading.
 * $wgAvailableRights - A list of available rights, in addition to the ones defined by the core.
 * $wgDisableInternalSearch - Disable internal search so that extensions can implement it.
 * $wgExceptionHooks - Hooks that are used for outputting exceptions.
 * $wgExtensionAliasesFiles - Aliases for special pages provided by extensions.
 * $wgExtensionCredits - Global list of extension credits.
 * $wgExtensionFunctions - Extension Functions
 * $wgExtensionMessagesFiles - Extension messages files.
 * $wgExternalStores - External stores allow including content from non database sources following URL links.
 * $wgHooks - Global list of hooks.
 * $wgPagePropLinkInvalidations - Page property link table invalidation lists.
 * $wgParserOutputHooks - Parser output hooks.
 * $wgSkinExtensionFunctions - Skin extension functions
 * $wgSpecialPageCacheUpdates - Additional functions to be performed with updateSpecialPages.php.
 * $wgSpecialPages - A list of custom special pages.

Maintenance Scripts setting

 * $wgCommandLineDarkBg - For colorized maintenance script output.
 * $wgCommandLineMode - Indicates whether MediaWiki is running in command-line mode. Should never be set manually!
 * $wgDBadminpassword - The password for $wgDBadminuser.
 * $wgDBadminuser - Database username used by the maintenance scripts.

Miscellaneous settings

 * $wgAntiLockFlags - Anti-lock flags.
 * $wgEnableHtmlDiff - Whether to allow visual comparison in diffs.
 * $wgEnableSOAP (deprecated) - Enable SOAP interface.
 * $wgExternalDiffEngine - Use external C++ diff engine (module wikidiff from the extensions package).
 * $wgLegacySchemaConversion (deprecated) - Option to speed up the conversion step for large sites when migrating the schema from 1.4 to 1.5.
 * $wgLivePreview - Enable live preview, see also Manual:Live preview.
 * $wgMaxShellFileSize - Maximum file size created by shell processes under Linux, in KB.
 * $wgMaxShellMemory - Maximum amount of virtual memory available to shell processes under Linux, in KB.
 * $wgMaxShellTime - Maximum CPU time in seconds for shell processes under linux.
 * $wgShellLocale - Locale for.
 * $wgUseAutomaticEditSummaries - Turn off automatic edit summaries.
 * $wgUseBetterLinksUpdate (deprecated)
 * $wgUseData (deprecated)
 * $wgUseExternalDiffEngine (deprecated) - Use external C++ diff engine (module wikidiff from the extensions package).
 * $wgUseGeoMode (deprecated) - Recognise longitude/latitude coordinates.
 * $wgUseOldExistenceCheck (deprecated) - Use old prefill link method, for debugging only.
 * $wgUserBlockExpiration (deprecated) - User blocks expire after this many seconds.
 * $wgUseTagFilter - Allow filtering by change tag in recentchanges, history, etc.
 * $wgUseTrackbacks - Whether to use trackbacks.
 * $wgUseValidation (deprecated) - Validation for print or other production versions.
 * $wgValidationForAnons (deprecated) - Whether to use article validation for anonymous users.