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

abstract class AbstractDemo
{
    abstract public function demo(string $demo):void;
}

final class DemoFile extends AbstractDemo
{
    public function demo(string $demo):void{
    }
        
}

Config rector.php

<?php

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

return RectorConfig::configure()
    // A. whole set
    ->withPreparedSets(typeDeclarations: true)
    // B. or few rules
    ->withRules([
        AddOverrideAttributeToOverriddenMethodsRector::class
    ]);

Rector version: b12180 - released at 2026-01-03 18:52