checkUsernames.php

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

class CheckUsernames extends Maintenance {

        public function __construct() {
                parent::__construct();
                $this->mDescription = "Verify that database usernames are actually valid";
        }

        function execute() {
                $dbr = wfGetDB( DB_SLAVE );

                $res = $dbr->select( 'user',
                        array( 'user_id', 'user_name' ),
                        null,
                        __METHOD__
                );

                foreach ( $res as $row ) {
                        if ( ! User::isValidUserName( $row->user_name ) ) {
                                $this->error( sprintf( "%s: %6d: '%s'\n", wfWikiID(), $row->user_id, $row->user_name ) );
                                wfDebugLog( 'checkUsernames', $row->user_name );
                        }
                }
        }
}

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