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.htaccess
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Action.php
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AjaxDispatcher.php
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AjaxResponse.php
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Article.php
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AuthPlugin.php
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AutoLoader.php
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Autopromote.php
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Block.php
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Category.php
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CategoryFinder.php
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CategoryPage.php
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CategoryViewer.php
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Categoryfinder.php
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Cdb.php
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Cdb_PHP.php
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ChangeTags.php
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ChangesFeed.php
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ChangesList.php
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Collation.php
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ConfEditor.php
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Cookie.php
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CryptRand.php
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DefaultSettings.php
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Defines.php
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DeprecatedGlobal.php
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DerivativeRequest.php
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DjVuImage.php
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DummyLinker.php
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EditPage.php
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EventRelayerGroup.php
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Exception.php
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Export.php
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ExternalEdit.php
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ExternalStore.php
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ExternalStoreDB.php
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ExternalStoreHttp.php
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ExternalUser.php
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FakeTitle.php
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Fallback.php
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FauxRequest.php
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Feed.php
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FeedUtils.php
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FileDeleteForm.php
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ForkController.php
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FormOptions.php
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GenderCache.php
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GitInfo.php
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GlobalFunctions.php
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HTMLForm.php
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HistoryBlob.php
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HistoryPage.php
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Hooks.php
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Html.php
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HtmlFormatter.php
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HttpFunctions.old.php
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HttpFunctions.php
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IP.php
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ImageFunctions.php
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ImageGallery.php
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ImagePage.php
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ImageQueryPage.php
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Import.php
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Init.php
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Licenses.php
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LinkFilter.php
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Linker.php
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LinksUpdate.php
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ListToggle.php
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LocalisationCache.php
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LogEventsList.php
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LogPage.php
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MWFunction.php
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MWGrants.php
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MWNamespace.php
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MWTimestamp.php
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MagicWord.php
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MagicWordArray.php
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MediaWiki.php
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MediaWikiServices.php
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MediaWikiVersionFetcher.php
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MergeHistory.php
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Message.php
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MessageBlobStore.php
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Metadata.php
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MimeMagic.php
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MovePage.php
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Namespace.php
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NoLocalSettings.php
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OutputHandler.php
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OutputPage.php
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PHPVersionCheck.php
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PHPVersionError.php
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PageProps.php
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PageQueryPage.php
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Pager.php
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PathRouter.php
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PatrolLog.php
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Pingback.php
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PoolCounter.php
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Preferences.php
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PrefixSearch.php
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ProtectionForm.php
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ProxyLookup.php
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ProxyTools.php
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QueryPage.php
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RawPage.php
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RecentChange.php
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RequestContext.php
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Revision.php
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ServiceWiring.php
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Setup.php
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SiteConfiguration.php
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SiteStats.php
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Skin.php
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SkinLegacy.php
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SkinTemplate.php
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SpecialPage.php
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SpecialPageFactory.php
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Status.php
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StreamFile.php
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StringUtils.php
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TemplateParser.php
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Title.php
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TitleArray.php
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User.php
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UserRightsProxy.php
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WatchedItem.php
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Wiki.php
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Xml.php
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XmlSelect.php
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XmlTypeCheck.php
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ZhClient.php
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ZhConversion.php
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ZipDirectoryReader.php
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limit.sh
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mime.info
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mime.types
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tidy.conf
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wp-blog-header.php
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wp-cron.php
2.74
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<?php /** * File for BacklinkCache class * @file */ /** * Class for fetching backlink lists, approximate backlink counts and * partitions. This is a shared cache. * * Instances of this class should typically be fetched with the method * $title->getBacklinkCache(). * * Ideally you should only get your backlinks from here when you think * there is some advantage in caching them. Otherwise it's just a waste * of memory. * * Introduced by r47317 * * @internal documentation reviewed on 18 Mar 2011 by hashar * * @author Tim Starling * @copyright © 2009, Tim Starling, Domas Mituzas * @copyright © 2010, Max Sem * @copyright © 2011, Ashar Voultoiz */ class BacklinkCache { /** * Multi dimensions array representing batches. Keys are: * > (string) links table name * > 'numRows' : Number of rows for this link table * > 'batches' : array( $start, $end ) * * @see BacklinkCache::partitionResult() * * Cleared with BacklinkCache::clear() */ protected $partitionCache = array(); /** * Contains the whole links from a database result. * This is raw data that will be partitioned in $partitionCache * * Initialized with BacklinkCache::getLinks() * Cleared with BacklinkCache::clear() */ protected $fullResultCache = array(); /** * Local copy of a database object. * * Accessor: BacklinkCache::getDB() * Mutator : BacklinkCache::setDB() * Cleared with BacklinkCache::clear() */ protected $db; /** * Local copy of a Title object */ protected $title; const CACHE_EXPIRY = 3600; /** * Create a new BacklinkCache * @param Title $title : Title object to create a backlink cache for. */ function __construct( $title ) { $this->title = $title; } /** * Serialization handler, diasallows to serialize the database to prevent * failures after this class is deserialized from cache with dead DB * connection. */ function __sleep() { return array( 'partitionCache', 'fullResultCache', 'title' ); } /** * Clear locally stored data and database object. */ public function clear() { $this->partitionCache = array(); $this->fullResultCache = array(); unset( $this->db ); } /** * Set the Database object to use * * @param $db DatabaseBase */ public function setDB( $db ) { $this->db = $db; } /** * Get the slave connection to the database * When non existing, will initialize the connection. * @return Database object */ protected function getDB() { if ( !isset( $this->db ) ) { $this->db = wfGetDB( DB_SLAVE ); } return $this->db; } /** * Get the backlinks for a given table. Cached in process memory only. * @param $table String * @param $startId Integer or false * @param $endId Integer or false * @return TitleArrayFromResult */ public function getLinks( $table, $startId = false, $endId = false ) { wfProfileIn( __METHOD__ ); $fromField = $this->getPrefix( $table ) . '_from'; if ( $startId || $endId ) { // Partial range, not cached wfDebug( __METHOD__ . ": from DB (uncacheable range)\n" ); $conds = $this->getConditions( $table ); // Use the from field in the condition rather than the joined page_id, // because databases are stupid and don't necessarily propagate indexes. if ( $startId ) { $conds[] = "$fromField >= " . intval( $startId ); } if ( $endId ) { $conds[] = "$fromField <= " . intval( $endId ); } $res = $this->getDB()->select( array( $table, 'page' ), array( 'page_namespace', 'page_title', 'page_id' ), $conds, __METHOD__, array( 'STRAIGHT_JOIN', 'ORDER BY' => $fromField ) ); $ta = TitleArray::newFromResult( $res ); wfProfileOut( __METHOD__ ); return $ta; } // @todo FIXME: Make this a function? if ( !isset( $this->fullResultCache[$table] ) ) { wfDebug( __METHOD__ . ": from DB\n" ); $res = $this->getDB()->select( array( $table, 'page' ), array( 'page_namespace', 'page_title', 'page_id' ), $this->getConditions( $table ), __METHOD__, array( 'STRAIGHT_JOIN', 'ORDER BY' => $fromField, ) ); $this->fullResultCache[$table] = $res; } $ta = TitleArray::newFromResult( $this->fullResultCache[$table] ); wfProfileOut( __METHOD__ ); return $ta; } /** * Get the field name prefix for a given table * @param $table String */ protected function getPrefix( $table ) { static $prefixes = array( 'pagelinks' => 'pl', 'imagelinks' => 'il', 'categorylinks' => 'cl', 'templatelinks' => 'tl', 'redirect' => 'rd', ); if ( isset( $prefixes[$table] ) ) { return $prefixes[$table]; } else { throw new MWException( "Invalid table \"$table\" in " . __CLASS__ ); } } /** * Get the SQL condition array for selecting backlinks, with a join * on the page table. * @param $table String */ protected function getConditions( $table ) { $prefix = $this->getPrefix( $table ); // @todo FIXME: imagelinks and categorylinks do not rely on getNamespace, // they could be moved up for nicer case statements switch ( $table ) { case 'pagelinks': case 'templatelinks': $conds = array( "{$prefix}_namespace" => $this->title->getNamespace(), "{$prefix}_title" => $this->title->getDBkey(), "page_id={$prefix}_from" ); break; case 'redirect': $conds = array( "{$prefix}_namespace" => $this->title->getNamespace(), "{$prefix}_title" => $this->title->getDBkey(), $this->getDb()->makeList( array( "{$prefix}_interwiki = ''", "{$prefix}_interwiki is null", ), LIST_OR ), "page_id={$prefix}_from" ); break; case 'imagelinks': $conds = array( 'il_to' => $this->title->getDBkey(), 'page_id=il_from' ); break; case 'categorylinks': $conds = array( 'cl_to' => $this->title->getDBkey(), 'page_id=cl_from', ); break; default: throw new MWException( "Invalid table \"$table\" in " . __CLASS__ ); } return $conds; } /** * Get the approximate number of backlinks * @param $table String * @return integer */ public function getNumLinks( $table ) { if ( isset( $this->fullResultCache[$table] ) ) { return $this->fullResultCache[$table]->numRows(); } if ( isset( $this->partitionCache[$table] ) ) { $entry = reset( $this->partitionCache[$table] ); return $entry['numRows']; } $titleArray = $this->getLinks( $table ); return $titleArray->count(); } /** * Partition the backlinks into batches. * Returns an array giving the start and end of each range. The first * batch has a start of false, and the last batch has an end of false. * * @param $table String: the links table name * @param $batchSize Integer * @return Array */ public function partition( $table, $batchSize ) { // 1) try partition cache ... if ( isset( $this->partitionCache[$table][$batchSize] ) ) { wfDebug( __METHOD__ . ": got from partition cache\n" ); return $this->partitionCache[$table][$batchSize]['batches']; } $this->partitionCache[$table][$batchSize] = false; $cacheEntry =& $this->partitionCache[$table][$batchSize]; // 2) ... then try full result cache ... if ( isset( $this->fullResultCache[$table] ) ) { $cacheEntry = $this->partitionResult( $this->fullResultCache[$table], $batchSize ); wfDebug( __METHOD__ . ": got from full result cache\n" ); return $cacheEntry['batches']; } // 3) ... fallback to memcached ... global $wgMemc; $memcKey = wfMemcKey( 'backlinks', md5( $this->title->getPrefixedDBkey() ), $table, $batchSize ); $memcValue = $wgMemc->get( $memcKey ); if ( is_array( $memcValue ) ) { $cacheEntry = $memcValue; wfDebug( __METHOD__ . ": got from memcached $memcKey\n" ); return $cacheEntry['batches']; } // 4) ... finally fetch from the slow database :( $this->getLinks( $table ); $cacheEntry = $this->partitionResult( $this->fullResultCache[$table], $batchSize ); // Save to memcached $wgMemc->set( $memcKey, $cacheEntry, self::CACHE_EXPIRY ); wfDebug( __METHOD__ . ": got from database\n" ); return $cacheEntry['batches']; } /** * Partition a DB result with backlinks in it into batches * @param $res ResultWrapper database result * @param $batchSize integer * @return array @see */ protected function partitionResult( $res, $batchSize ) { $batches = array(); $numRows = $res->numRows(); $numBatches = ceil( $numRows / $batchSize ); for ( $i = 0; $i < $numBatches; $i++ ) { if ( $i == 0 ) { $start = false; } else { $rowNum = intval( $numRows * $i / $numBatches ); $res->seek( $rowNum ); $row = $res->fetchObject(); $start = $row->page_id; } if ( $i == $numBatches - 1 ) { $end = false; } else { $rowNum = intval( $numRows * ( $i + 1 ) / $numBatches ); $res->seek( $rowNum ); $row = $res->fetchObject(); $end = $row->page_id - 1; } # Sanity check order if ( $start && $end && $start > $end ) { throw new MWException( __METHOD__ . ': Internal error: query result out of order' ); } $batches[] = array( $start, $end ); } return array( 'numRows' => $numRows, 'batches' => $batches ); } }