Try Rector Online | Rector - Automated Way to Instantly Upgrade and Refactor any PHP code

Run Rector on your code to see what it can do for you:

// no change

PHP snippet to change

<?php

final class DemoFile implements \Stringable
{
    public function __toString(): string
    {
        throw new \Exception('Not implemented');
    }
}

Config rector.php

<?php

use Rector\Config\RectorConfig;
use Rector\TypeDeclaration\Rector\Property\TypedPropertyFromAssignsRector;

return RectorConfig::configure()
    ->withRules([
        Rector\Php80\Rector\Class_\StringableForToStringRector::class
    ])
    ->withPreparedSets(
        deadCode: true
    );

Rector version: 2.2.14 - released at 2025-12-09 11:53