deleteDefaultMessages.php

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<?php
require_once __DIR__ . '/Maintenance.php';

class DeleteDefaultMessages extends Maintenance {
    public function __construct() {
        parent::__construct();
        $this->addDescription( 'Deletes all pages in the MediaWiki namespace' .
            ' which were last edited by "MediaWiki default"' );
        $this->addOption( 'dry-run', 'Perform a dry run, delete nothing' );
    }

    public function execute() {
        global $wgUser;

        $this->output( "Checking existence of old default messages..." );
        $dbr = $this->getDB( DB_REPLICA );

        $actorQuery = ActorMigration::newMigration()
            ->getWhere( $dbr, 'rev_user', User::newFromName( 'MediaWiki default' ) );
        $res = $dbr->select(
            [ 'page', 'revision' ] + $actorQuery['tables'],
            [ 'page_namespace', 'page_title' ],
            [
                'page_namespace' => NS_MEDIAWIKI,
                $actorQuery['conds'],
            ],
            __METHOD__,
            [],
            [ 'revision' => [ 'JOIN', 'page_latest=rev_id' ] ] + $actorQuery['joins']
        );

        if ( $dbr->numRows( $res ) == 0 ) {
            // No more messages left
            $this->output( "done.\n" );
            return;
        }

        $dryrun = $this->hasOption( 'dry-run' );
        if ( $dryrun ) {
            foreach ( $res as $row ) {
                $title = Title::makeTitle( $row->page_namespace, $row->page_title );
                $this->output( "\n* [[$title]]" );
            }
            $this->output( "\n\nRun again without --dry-run to delete these pages.\n" );
            return;
        }

        // Deletions will be made by $user temporarly added to the bot group
        // in order to hide it in RecentChanges.
        $user = User::newFromName( 'MediaWiki default' );
        if ( !$user ) {
            $this->fatalError( "Invalid username" );
        }
        $user->addGroup( 'bot' );
        $wgUser = $user;

        // Handle deletion
        $this->output( "\n...deleting old default messages (this may take a long time!)...", 'msg' );
        $dbw = $this->getDB( DB_MASTER );

        foreach ( $res as $row ) {
            wfWaitForSlaves();
            $dbw->ping();
            $title = Title::makeTitle( $row->page_namespace, $row->page_title );
            $page = WikiPage::factory( $title );
            $error = ''; // Passed by ref
            // FIXME: Deletion failures should be reported, not silently ignored.
            $page->doDeleteArticle( 'No longer required', false, 0, true, $error, $user );
        }

        $this->output( "done!\n", 'msg' );
    }
}

$maintClass = DeleteDefaultMessages::class;
require_once RUN_MAINTENANCE_IF_MAIN;