rebuildmessages.php

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<?php
require_once( dirname( __FILE__ ) . '/Maintenance.php' );

class RebuildMessages extends Maintenance {
        public function __construct() {
                parent::__construct();
                $this->mDescription = "Purge all language messages from the cache";
        }

        public function execute() {
                global $wgLocalDatabases, $wgDBname, $wgEnableSidebarCache, $messageMemc;
                if ( $wgLocalDatabases ) {
                        $databases = $wgLocalDatabases;
                } else {
                        $databases = array( $wgDBname );
                }

                foreach ( $databases as $db ) {
                        $this->output( "Deleting message cache for {$db}... " );
                        $messageMemc->delete( "{$db}:messages" );
                        if ( $wgEnableSidebarCache )
                                $messageMemc->delete( "{$db}:sidebar" );
                        $this->output( "Deleted\n" );
                }
        }
}

$maintClass = "RebuildMessages";
require_once( RUN_MAINTENANCE_IF_MAIN );