update.php

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<?php
if ( !function_exists( 'version_compare' ) || ( version_compare( phpversion(), '5.2.3' ) < 0 ) ) {
        echo "You are using PHP version " . phpversion() . " but MediaWiki needs PHP 5.2.3 or higher. ABORTING.\n" .
        "Check if you have a newer php executable with a different name, such as php5.\n";
        die( 1 );
}

$wgUseMasterForMaintenance = true;
require_once( dirname( __FILE__ ) . '/Maintenance.php' );

class UpdateMediaWiki extends Maintenance {

        function __construct() {
                parent::__construct();
                $this->mDescription = "MediaWiki database updater";
                $this->addOption( 'skip-compat-checks', 'Skips compatibility checks, mostly for developers' );
                $this->addOption( 'quick', 'Skip 5 second countdown before starting' );
                $this->addOption( 'doshared', 'Also update shared tables' );
                $this->addOption( 'nopurge', 'Do not purge the objectcache table after updates' );
                $this->addOption( 'force', 'Override when $wgAllowSchemaUpdates disables this script' );
        }

        function getDbType() {
                /* If we used the class constant PHP4 would give a parser error here */
                return 2 /* Maintenance::DB_ADMIN */;
        }

        function compatChecks() {
                $test = new PhpXmlBugTester();
                if ( !$test->ok ) {
                        $this->error(
                                "Your system has a combination of PHP and libxml2 versions which is buggy\n" .
                                "and can cause hidden data corruption in MediaWiki and other web apps.\n" .
                                "Upgrade to PHP 5.2.9 or later and libxml2 2.7.3 or later!\n" .
                                "ABORTING (see http://bugs.php.net/bug.php?id=45996).\n",
                                true );
                }

                $test = new PhpRefCallBugTester;
                $test->execute();
                if ( !$test->ok ) {
                        $ver = phpversion();
                        $this->error(
                                "PHP $ver is not compatible with MediaWiki due to a bug involving\n" .
                                "reference parameters to __call. Upgrade to PHP 5.3.2 or higher, or \n" .
                                "downgrade to PHP 5.3.0 to fix this.\n" .
                                "ABORTING (see http://bugs.php.net/bug.php?id=50394 for details)\n",
                                true );
                }
        }

        function execute() {
                global $wgVersion, $wgTitle, $wgLang, $wgAllowSchemaUpdates;

                if( !$wgAllowSchemaUpdates && !$this->hasOption( 'force' ) ) {
                        $this->error( "Do not run update.php on this wiki. If you're seeing this you should\n"
                                . "probably ask for some help in performing your schema updates.\n\n"
                                . "If you know what you are doing, you can continue with --force", true );
                }

                $wgLang = Language::factory( 'en' );
                $wgTitle = Title::newFromText( "MediaWiki database updater" );

                $this->output( "MediaWiki {$wgVersion} Updater\n\n" );

                wfWaitForSlaves( 5 ); // let's not kill databases, shall we? ;) --tor

                if ( !$this->hasOption( 'skip-compat-checks' ) ) {
                        $this->compatChecks();
                } else {
                        $this->output( "Skipping compatibility checks, proceed at your own risk (Ctrl+C to abort)\n" );
                        wfCountdown( 5 );
                }

                # Attempt to connect to the database as a privileged user
                # This will vomit up an error if there are permissions problems
                $db = wfGetDB( DB_MASTER );

                $this->output( "Going to run database updates for " . wfWikiID() . "\n" );
                $this->output( "Depending on the size of your database this may take a while!\n" );

                if ( !$this->hasOption( 'quick' ) ) {
                        $this->output( "Abort with control-c in the next five seconds (skip this countdown with --quick) ... " );
                        wfCountDown( 5 );
                }

                $shared = $this->hasOption( 'doshared' );

                $updates = array( 'core', 'extensions', 'stats' );
                if( !$this->hasOption('nopurge') ) {
                        $updates[] = 'purge';
                }

                $updater = DatabaseUpdater::newForDb( $db, $shared, $this );
                $updater->doUpdates( $updates );

                foreach( $updater->getPostDatabaseUpdateMaintenance() as $maint ) {
                        if ( $updater->updateRowExists( $maint ) ) {
                                continue;
                        }
                        $child = $this->runChild( $maint );
                        $child->execute();
                        $updater->insertUpdateRow( $maint );
                }

                $this->output( "\nDone.\n" );
        }

        function afterFinalSetup() {
                global $wgLocalisationCacheConf;

                # Don't try to access the database
                # This needs to be disabled early since extensions will try to use the l10n
                # cache from $wgExtensionFunctions (bug 20471)
                $wgLocalisationCacheConf = array(
                        'class' => 'LocalisationCache',
                        'storeClass' => 'LCStore_Null',
                        'storeDirectory' => false,
                        'manualRecache' => false,
                );
        }
}

$maintClass = 'UpdateMediaWiki';
require_once( RUN_MAINTENANCE_IF_MAIN );