Manual:Configuration settings (alphabetical)

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.

This index is in alphabetical order (ignoring the $wg prefix). Note that the only setting without this prefix is $IP, which is listed under I.

Listed alphabetically | Listed by function

A

 * $wgAccountCreationThrottle - Number of accounts each IP address may create, 0 to disable. Requires memcached.
 * $wgActionPaths - Paths for various user actions. Used to 'pretty' URLs.
 * $wgAjaxSearch - Enables search-suggestions.
 * $wgAllowAnonymousMinor - Allow anonymous users to mark changes as 'minor'
 * $wgAllowCategorizedRecentChanges - Allow to filter the recent changes by a category or one of its sub(subsubsub...)categories
 * $wgAllowCopyUploads - Allow uploads from URLs as well as local files.
 * $wgAllowExternalImages - Whether to allow inline image pointing to other websites.
 * $wgAllowPageInfo - Allow the "info" action, very inefficient at the moment.
 * $wgAllowRealName - Whether or not to allow real name fields.
 * $wgAllowSysopQueries - Set to allow sysop queries.
 * $wgAllowUserCss - Allow user Cascading Style Sheets (CSS)
 * $wgAllowUserJs - Allow user Javascript pages
 * $wgAmericanDates - Enable for English module to print dates as eg 'May 12' instead of '12 May'.
 * $wgAntiLockFlags - Anti-lock flags.
 * $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.
 * $wgArticlePath - The URL template used to create article links.
 * $wgAuth - Authentication plugin. See AuthPlugin.php.
 * $wgAutoblockExpiry - Number of seconds before autoblock entries expire
 * $wgAutoConfirmAge - Number of seconds an account is required to age before it's given the implicit 'autoconfirm' group membership. This can be used to limit privileges of new accounts.
 * $wgAutoConfirmCount - Number of edits an account requires before it is autoconfirmed; passing both this AND the time requirement ($wgAutoConfirmAge) is needed

B

 * $wgBadRanges
 * $wgBadUserAgents
 * $wgBlockAllowsUTEdit - Allow blocked users to edit their talk pages
 * $wgBlockOpenProxies - Automatic open proxy test on edit.
 * $wgBrowserBlackList - Browser Blacklist for unicode non compliant browsers.
 * $wgBufferSQLResults - use buffered queries by default.

C

 * $wgCacheEpoch - Set this to current time to invalidate all prior cached pages.
 * $wgCachePages - Allow client-side caching of pages
 * $wgCacheSharedUploads - Cache shared metadata in memcached.
 * $wgCapitalLinks - Set this to false to avoid forcing the first letter of links to capitals.
 * $wgCategoryMagicGallery - On category pages, show thumbnail gallery for images belonging to that category instead of listing them as articles.
 * $wgCheckCopyrightUpload - Set this to false if you want to disable checking that detailed copyright information values are not empty.
 * $wgCheckFileExtensions - This is a flag to determine whether or not to check file extensions on upload.
 * $wgClockSkewFudge - Helps avoid cache problems due to timer resolution.
 * $wgCommandLineMode - Indicates whether MW is running in command-line mode. Should never be set manually!
 * $wgCommandLineDarkBg -
 * $wgCompressedPersistentLC - Use gzcompressed blobs.
 * $wgCompressRevisions - If this is set on, old revisions will be compressed on page save if zlib support is available.
 * $wgCookieDomain - Set to set an explicit domain on the login cookies.
 * $wgCookieExpiration
 * $wgCookiePath
 * $wgCopyrightIcon - Set this to some HTML to override the rights icon with an arbitrary logo.
 * $wgCountCategorizedImagesAsUsed - On Special:Unusedimages, consider images "used" if they are put into a category.

D

 * $wgDBClusterTimeout - When to give error messages.
 * $wgDBconnection -
 * $wgDBerrorLog - File to log MySQL errors to.
 * $wgDBloads
 * $wgDBminWordLen - Used to discard words that MySQL will not return any results for shorter values configure mysql directly.
 * $wgDBmwschema - Schema that Postgres stores the MediaWiki tables in. Defaults to 'mediawiki'
 * $wgDBmysql4 - Set to true to use enhanced fulltext search.
 * $wgDBname - Name of the database.
 * $wgDBpassword - The password for $wgDBuser.
 * $wgDBport - Database port.
 * $wgDBprefix - Table name prefix.
 * $wgDBschema - On some databases this allows separate logical namespace for application data.
 * $wgDBserver - Database host name or ip address.
 * $wgDBservers - Database load balancer.
 * $wgDBsqlpassword - The password for $wgDBsqluser.
 * $wgDBsqluser - The SQL user used for queries.
 * $wgDBtransactions - Set to true if using InnoDB tables.
 * $wgDBts2schema - Schema that the Tsearch2 tables live in for Postgres. Defaults to 'public'
 * $wgDBtype - Type of database.
 * $wgDBuser - Database username.
 * $wgDebugComments
 * $wgDebugDumpSql
 * $wgDebugFunctionEntry - Output debug message on every wfProfileIn/wfProfileOut
 * $wgDebugLogFile - The file name of the debug log, or empty if disabled. wfDebug appends to this file.
 * $wgDebugProfiling - Detects non-matching wfProfileIn/wfProfileOut calls
 * $wgDebugRawPage - Avoid overlapping debug entries by leaving out CSS.
 * $wgDebugRedirects
 * $wgDebugSquid - Lots of debugging output from SquidUpdate.php
 * $wgDefaultBlockExpiry - Default expiry time in strtotime format, or "infinite" for an infinite block.
 * $wgDefaultSkin - The default skin.
 * $wgDefaultUserOptions - Settings added to this array will override the language globals for the user preferences used by anonymous visitors and newly created accounts.
 * $wgDiff3 - Path to the GNU diff3 utility.
 * $wgDisableAnonTalk - Disable talk pages for anonymous users (IPs).
 * $wgDisableCookieCheck
 * $wgDisableCounters
 * $wgDisabledActions - Array of disabled article actions, e.g. view, edit, dublincore, delete, etc.
 * $wgDisableFuzzySearch
 * $wgDisableHardRedirects - Disable redirects to special pages and interwiki redirects, which use a 302 and have no "redirected from" link.
 * $wgDisableInternalSearch - Disable internal search so that extensions can implement it.
 * $wgDisableLangConversion - Whether to enable language variant conversion.
 * $wgDisableQueryPages - Disable all query pages if miser mode is on, not just some.
 * $wgDisableSearchUpdate - If you've disabled search semi-permanently, this also disables updates to the table.
 * $wgDisableTextSearch - Disables full text search.
 * $wgDisableUploads - If set, disables the upload page and hides the link.
 * $wgDocType - The doc type to use in the  declaration.
 * $wgDTD

E

 * $wgEditEncoding
 * $wgEmailAuthentication - Whether Email authentication (confirmation) is needed for that wiki for using any Email function (except password reminder which works independently from this setting)
 * $wgEmailConfirmToEdit - Require a confirmed address to edit pages (for version 1.6 and newer)
 * $wgEmergencyContact - Site admin email address
 * $wgEnableCreativeCommonsRdf - What does this do?
 * $wgEnableDublinCoreRdf
 * $wgEnableEmail - Set to true to enable the e-mail basic features: Password reminders, etc.
 * $wgEnableOpm - Use opm.blitzed.org to check for open proxies. Not yet actually used.
 * $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.
 * $wgEnablePersistentLC - Obsolete, do not use!
 * $wgEnableScaryTranscluding - Enable scary transclusion (transcluding from another wiki)
 * $wgEnableSOAP - Enable SOAP interface.
 * $wgEnableSorbs - Use http.dnsbl.sorbs.net to check for open proxies.
 * $wgEnableUploads - Set to true to allow logged-in users to upload files.
 * $wgEnableUserEmail - Set to true to enable user-to-user e-mail.
 * $wgEnotifFromEditor - Email notifications appear to be coming from the page editor (not from Wiki server)
 * $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)
 * $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)
 * $wgExtensionFunctions
 * $wgExternalStores - External stores allow including content from non database sources following URL links.
 * $wgExtraNamespaces - Additional namespaces.
 * $wgExtraRandompageSQL - Filter for Special:Randompage. Part of a WHERE clause.
 * $wgExtraSubtitle - The subtitle to appear under every title.

F

 * $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.
 * $wgFileBlacklist - Files with these extensions will never be allowed as uploads.
 * $wgFileCacheDirectory
 * $wgFileExtensions - This is the list of preferred extensions for uploading files. Uploading files with extensions not in this list will trigger a warning.
 * $wgFileStore
 * $wgFilterCallback - Similarly (to $wgSpamRegex) if this function returns true
 * $wgForceUIMsgAsContentMsg

G

 * $wgGoToEdit - Go button goes straight to the edit screen if the article doesn't exist
 * $wgGroupPermissions - Use this to set access rights for groups and users.

H

 * $wgHashedSharedUploadDirectory - Whether to hash the shared upload directory.
 * $wgHashedUploadDirectory - If true, use the /a/ab/foo.png directory structure.
 * $wgHideInterlanguageLinks - Hide interlanguage links from the sidebar.
 * $wgHitcounterUpdateFreq - Sets how often page counters should be updated.
 * $wgHooks - Global list of hooks.
 * $wgHTCPMulticastAddress - Not used yet. Commented out.
 * $wgHTCPMulticastTTL
 * $wgHTCPPort

I

 * $wgIgnoreSQLErrors - Whether to disable automatic generation of "we're sorry, but there has been a database error" pages.
 * $wgImageHtmlCacheExpiry - Set to a number of seconds to cache the HTML associated with an image.
 * $wgImageLimits - Limit images on image description pages to a user-selectable limit.
 * $wgImageMagickConvertCommand - Set to the command used to evoke ImageMagick.
 * $wgImportSources - List of interwiki prefixes for wikis we'll accept as sources for Special:Import (for sysops).
 * $wgInputEncoding - The encoding of the input text.
 * $wgInternalServer - Internal server name as known to Squid, if different.
 * $wgInterwikiCache
 * $wgInterwikiExpiry - Expiry time for cache of interwiki table.
 * $wgInterwikiFallbackSite
 * $wgInterwikiMagic - Treat language links as magic connectors, not inline links.
 * $wgInterwikiScopes
 * $wgIPBlockExpiration - IP blocks expire after this many seconds.
 * $IP - The filesystem installation directory. Not in DefaultSettings.php.

J

 * $wgJsMimeType - Select which media type (MIME type) to use for JavaScript
 * $wgJobRunRate - Speed of the background task job queue (e.g. update of links)

L

 * $wgLanguageCode - Site language code. Should be one of the ./language/Language(.*).php files.
 * $wgLanguageFile - 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.
 * $wgLegalTitleChars - Override the default list of illegal characters in page titles.
 * $wgLegacySchemaConversion - Option to speed up the conversion step for large sites when migrating the schema from 1.4 to 1.5
 * $wgLinkCacheMemcached - Cache links using object cache setting (memcache, Turck MMCache, eAccelerator, etc.)
 * $wgLivePreview - Experimental preview feature to fetch rendered text over an XMLHttpRequest from JavaScript instead of forcing a submit and reload of the whole page. Leave disabled unless you're testing it.
 * $wgLoadFileinfoExtension - Switch for loading the FileInfo extension by PECL at runtime.
 * $wgLocalDatabases - Other wikis on this site, can be administered from a single developer account.
 * $wgLocalInterwiki - The Interwiki prefix of this wiki. It should always changed in LocalSettings.php.
 * $wgLocaltimezone - Fake out the timezone that the server thinks it's in.
 * $wgLocalTZoffset - add a distance to the timezone of the server
 * $wgLogActions
 * $wgLogHeaders
 * $wgLogNames
 * $wgLogRestrictions
 * $wgLogTypes
 * $wgLogo - The URL of the site logo.
 * $wgLogQueries

M

 * $wgMakeDumpLinks - Produce hashed HTML article paths.
 * $wgMainCacheType - Replaces $wgUseMemCached.
 * $wgMasterWaitTimeout - How long to wait for a slave to catch up to the master.
 * $wgMathDirectory - The file system path of the directory containing LaTeX math images.
 * $wgMathPath - The URL base of the directory containing LaTeX math images.
 * $wgMaxCredits - Set this to the number of authors that you want to be credited below an article text.
 * $wgMaxNameChars - Maximum number of bytes in username.
 * $wgMaxShellMemory - Maximum amount of virtual memory available to shell processes under linux, in KB.
 * $wgMaxSquidPurgeTitles - Maximum number of titles to purge in any one client operation
 * $wgMaxTocLevel - Maximum indent level of toc.
 * $wgMaxUploadSize - Maximum size of uploaded files.
 * $wgMemCachedDebug - Will be set to false in Setup.php, if the server isn't working.
 * $wgMemCachedServers
 * $wgMetaNamespace - The name used for the meta-namespace.
 * $wgMetaNamespaceTalk - The name used for the meta-namespace talk pages.
 * $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.
 * $wgMiserMode - If true, disable database-intensive features
 * $wgMsgCacheExpiry - When a message in cache expires (in seconds).

N

 * $wgNamespaceAliases - override default names for namespaces
 * $wgNamespaceRobotPolicies
 * $wgNamespaceProtection - Set the minimum permissions required to edit pages in each namespace. If you list more than one permission, a user must have all of them to edit pages in that namespace.
 * $wgNamespacesToBeSearchedDefault - Which namespaces should be searched?
 * $wgNamespacesWithSubpages - Which namespaces should support subpages?
 * $wgNavigationLinks - Navigation links for the user sidebar.
 * $wgNoFollowLinks - If true, external URL links in wiki text will be given the  attribute.
 * $wgNoFollowNsExceptions - Namespaces in which $wgNoFollowLinks doesn't apply.
 * $wgNoReplyAddress - Dummy address which should be accepted during mail send action.

O

 * $wgOutputEncoding - The encoding of the output text.

P

 * $wgPartialMessageCache
 * $wgPasswordSalt - For compatibility with old installations set to false.
 * $wgPasswordSender - Password reminder email address.
 * $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
 * $wgProfileSampleRate - Only profile every n requests when profiling is turned on
 * $wgProfileToCommentUser - 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 - Enable for more detailed by-function times in debug log
 * $wgProxyKey - Deprecated, replaced by $wgSecretKey.
 * $wgProxyList - Big list of banned IP addresses. In the keys not the values.
 * $wgProxyMemcExpiry
 * $wgProxyPorts
 * $wgProxyScriptPath
 * $wgProxyWhitelist - Proxy whitelist, list of addresses that are assumed to be non-proxy despite what the other methods might say
 * $wgPutIPinRC - Log IP addresses in the recentchanges table.

R

 * $wgRangeBlockUser
 * $wgRangeBlockReason
 * $wgRateLimitLog - Set to a filename to log rate limiter hits.
 * $wgRateLimits - Simple rate limiter options to brake edit floods.
 * $wgRawHtml - Allow raw, unchecked HTML in ... sections.
 * $wgRC2UDPAddress
 * $wgRC2UDPPort
 * $wgRC2UDPPrefix
 * $wgRCMaxAge - Recentchanges items are periodically purged; entries older than this many seconds will go.
 * $wgRCSeconds - Show seconds in Recent Changes.
 * $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.
 * $wgRedirectScript - The URL of redirect.php, needed for backwards compatibility.
 * $wgRedirectSources
 * $wgRemoteUploads - Set to true to enable the upload link while local uploads are disabled.
 * $wgRepositoryBaseUrl - Base URL for a repository wiki.
 * $wgRestrictedNamespaces - ???
 * $wgRestrictionTypes
 * $wgRightsIcon
 * $wgRightsPage
 * $wgRightsText
 * $wgRightsUrl

S

 * $wgSaveDeletedFiles
 * $wgScript - The URL of index.php.
 * $wgScriptPath - The base URL path.
 * $wgSearchForwardUrl - Set this to a URL to forward search requests to some external location.
 * $wgSearchType - Type of DB search used.
 * $wgSecondaryMessageDB - DB to fall back on if the message isn't in the main DB
 * $wgSecretKey - This should always be customised in LocalSettings.php
 * $wgServer - The base URL of the server.
 * $wgServerName - The name of the server without the protocol. (eg, "en.wikipedia.org")
 * $wgSessionsInMemcached
 * $wgSharedDB - The name of the shared database.
 * $wgSharedLatin1 - set true if the repository uses latin1 filenames.
 * $wgSharedThumbnailScriptPath - Same as $wgThumbnailScriptPath, but for shared uploads.
 * $wgSharedUploadDBname - DB name with metadata about shared directory.
 * Manual:$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.
 * $wgShowCreditsIfMax - If there are more than $wgMaxCredits authors, show $wgMaxCredits of them.
 * $wgShowIPinHeader - Show the IP in the user bar for anonymous users by default.
 * $wgShowSQLErrors - Whether to show "we're sorry, but there has been a database error" pages.
 * $wgShowUpdatedMarker - Show "Updated (since my last visit)" marker in RC view, watchlist and history.
 * $wgSitename - The name of the site. Should be changed
 * $wgSiteNotice - If set, a bold ugly notice will show up at the top of every page.
 * $wgSiteSupportPage - A page where you users can receive donations.
 * $wgSkinExtensionFunctions
 * $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.
 * $wgSMTP - For using a direct (authenticated) SMTP server connection.
 * $wgSpamRegex - Text matching this regex will be recognised as spam.
 * $wgSqlLogFile
 * $wgSqlTimeout
 * $wgSquidFastPurge - 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.
 * $wgStockPath - For stock images that come with MediaWiki
 * $wgStrictFileExtensions - If this is turned off, users may override the warning for files not covered by $wgFileExtensions.
 * $wgStyleDirectory - The file system path to the skins directory.
 * $wgStylePath - The URL of the skins directory.
 * $wgStyleSheetDirectory - The file system path of the directory containing the stylesheets.
 * $wgStyleSheetPath - The URL of the directory containing the stylesheets.
 * $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.
 * $wgSysopRangeBans - Allow sysops to ban IP ranges
 * $wgSysopUserBans - Allow sysops to ban logged-in users

T

 * $wgTexvc - Location of the texvc binary.
 * $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.
 * $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.
 * $wgTmpDirectory - The URL of the temporary directory.
 * $wgTranslateNumerals - For Hindi and Arabic use local numerals instead of Western style (0-9) numerals in interface.
 * $wgTrivialMimeDetection - Switch for trivial mime detection.

U

 * $wgUploadBaseUrl
 * $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.
 * $wgUrlProtocols - Defines the protocols which are supported and translated in HTML by the mediawiki parser.
 * $wgUseAjax - Enables search Suggestions.
 * $wgUseBetterLinksUpdate
 * $wgUseCategoryBrowser - Disable experimental dmoz-like category browsing.
 * $wgUseCategoryMagic - Should the category pseudo-namespace be used?
 * $wgUseCopyrightUpload - Set this to true if you want detailed copyright information forms on Upload.
 * $wgUseData
 * $wgUseDatabaseMessages - Translation using MediaWiki: namespace.
 * $wgUseDumbLinkUpdate - Do /  for link updates instead of incremental.
 * $wgUseDynamicDates - Enable to allow rewriting dates in page text. DOES NOT FORMAT CORRECTLY FOR MOST LANGUAGES.
 * $wgUseEAccelShm - You can use this for persistent caching where your wiki runs on a single server.
 * $wgUserBlockExpiration - User blocks expire after this many seconds.
 * $wgUseESI - If you run Squid3 with ESI support, enable this.
 * $wgUseETag
 * $wgUseExternalDiffEngine - Use external C++ diff engine (module wikidiff from the extensions package).
 * $wgUseFileCache - This will cache static pages for non-logged-in users to reduce database traffic on public sites.
 * $wgUseGeoMode - Recognise longitude/latitude coordinates.
 * $wgUseGzip - Use GZip to store cached pages.
 * $wgUseImageMagick - Resizing can be done using PHP's internal image libraries or using ImageMagick.
 * $wgUseImageResize - Set $wgUseImageResize to true if you want to enable dynamic server side image resizing ("Thumbnails")
 * $wgUseLatin1 - Enable ISO-8859-1 compatibility mode.
 * $wgUseMemCached - Use memcache, using the servers set in Manual:$wgMemCachedServers.
 * $wgUseOldExistenceCheck - Use old prefill link method, for debugging only.
 * $wgUsePathInfo - Whether to use 'pretty' URLs.
 * $wgUsePHPTal
 * $wgUseRCPatrol - Use RC Patrolling to check for vandalism
 * $wgUserHtml - Allow limited user-specified HTML in wiki pages? removed in 1.10.
 * $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).
 * $wgUseSiteCss - Use the site's Cascading Style Sheets (CSS)
 * $wgUseSiteJs - Use the site's Javascript page
 * $wgUseSquid - Enable/disable Squid.
 * $wgUseTeX - Enables the use of (TeX) tags.
 * $wgUseTidy - Use tidy to make sure HTML output is sane.
 * $wgUseTrackbacks
 * $wgUseTurckShm - Use Turck MMCache shared memory.
 * $wgUseValidation - Validation for print or other production versions
 * $wgUseWatchlistCache - Generate a watchlist once every hour or so.
 * $wgUseXMLparser - Use XML parser?
 * $wgUseZhdaemon - Whether to use zhdaemon to perform Chinese text processing.

V

 * $wgValidationForAnons - Whether to use article validation for anonymous users.
 * $wgVerifyMimeType - Determines if the mime type of uploaded files should be checked
 * $wgVersion - Contains the current version of MediaWiki, as displayed to the user.

W

 * $wgWantedPagesThreshold - Minimum number of links required before a page is listed on Special:Wantedpages
 * $wgWhitelistAccount - Types of accounts that can create new users.
 * $wgWhitelistEdit - If true, users must login to edit.
 * $wgWhitelistRead - Pages anonymous user may see.
 * $wgWLCacheTimeout - The hour or so mentioned above.

Z

 * $wgZhdaemonHost - The host which zhdaemon is on. This is only used if $wgUseZhdaemon is set.
 * $wgZhdaemonPort - The port on Manual:$wgZhdaemonHost which zhdaemon is on.