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

trait DemoTrait {
    public function runSomething(): int {
    	return 1;
    }
}

abstract class DemoParent 
{
    use DemoTrait;
}

final class DemoFile extends DemoParent
{
    public function runSomething(): int {
        return 2;
    }
}

Config rector.php

<?php

use Rector\Config\RectorConfig;
use Rector\Php83\Rector\ClassMethod\AddOverrideAttributeToOverriddenMethodsRector;

return RectorConfig::configure()
    ->withConfiguredRule(AddOverrideAttributeToOverriddenMethodsRector::class, [
        'allow_override_empty_method' => true,
    ])
    ->withPhpVersion(80300);

Rector version: 9d02f9 - released at 2026-01-29 17:51