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";
        $this->setBatchSize( 1000 );
    }
 
    function execute() {
        $dbr = wfGetDB( DB_SLAVE );
 
        $maxUserId = 0;
        do {
            $res = $dbr->select( 'user',
                array( 'user_id', 'user_name' ),
                array( 'user_id > ' . $maxUserId ),
                __METHOD__,
                array(
                    'ORDER BY' => 'user_id',
                    'LIMIT' => $this->mBatchSize,
                )
            );
 
            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 );
                }
            }
            $maxUserId = $row->user_id;
        } while ( $res->numRows() );
    }
}
 
$maintClass = "CheckUsernames";
require_once RUN_MAINTENANCE_IF_MAIN;