rebuildmessages.php

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<?php
require_once __DIR__ . '/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;