checkUsernames.php

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<?php
require_once __DIR__ . '/Maintenance.php';
 
use MediaWiki\MediaWikiServices;
 
class CheckUsernames extends Maintenance {
 
    public function __construct() {
        parent::__construct();
        $this->addDescription( 'Verify that database usernames are actually valid' );
        $this->setBatchSize( 1000 );
    }
 
    public function execute() {
        $dbr = $this->getDB( DB_REPLICA );
        $userNameUtils = MediaWikiServices::getInstance()->getUserNameUtils();
 
        $maxUserId = 0;
        do {
            $res = $dbr->newSelectQueryBuilder()
                ->select( [ 'user_id', 'user_name' ] )
                ->from( 'user' )
                ->where( 'user_id > ' . $maxUserId )
                ->orderBy( 'user_id' )
                ->limit( $this->getBatchSize() )
                ->fetchResultSet();
 
            foreach ( $res as $row ) {
                if ( !$userNameUtils->isValid( $row->user_name ) ) {
                    $this->output( sprintf( "Found: %6d: '%s'\n", $row->user_id, $row->user_name ) );
                    wfDebugLog( 'checkUsernames', $row->user_name );
                }
            }
            // @phan-suppress-next-line PhanPossiblyUndeclaredVariable $res has at at least one item
            $maxUserId = $row->user_id;
        } while ( $res->numRows() );
    }
}
 
$maintClass = CheckUsernames::class;
require_once RUN_MAINTENANCE_IF_MAIN;