-strlen("asdf", 1);
+strlen("asdf");

Configure your rector.php:

<?php

use Rector\Config\RectorConfig;
use Rector\Php71\Rector\FuncCall\RemoveExtraParametersRector;

return RectorConfig::configure()
    ->withRules([
        RemoveExtraParametersRector::class,
    ]);

SETS:  PHP 7.1 Code Quality