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:

     const STATUS_OK = 200;
     final class Response implements \Psr\Http\Message\ResponseInterface
     {
-        public function getStatusCode() { return 500;}
+        public function getStatusCode(): int { return 500;}
     }
 }

 namespace Vhost\Healthz {
     final class LivenessProbeHandler
     {
-        public static function handle(): \Psr\Http\Message\ResponseInterface
+        public static function handle(): \React\Http\Message\Response
         {
             return new \React\Http\Message\Response(\React\Http\Message\Response::STATUS_OK, ['Content-Type' => 'application/json'], '{"result":"healthy"}');
         }
     }
 }

PHP snippet to change

<?php

declare(strict_types=1);

namespace Psr\Http\Message{
    interface ResponseInterface
    {
        public function getStatusCode();
    }
}

namespace React\Http\Message {
    const STATUS_OK = 200;
    final class Response implements \Psr\Http\Message\ResponseInterface
    {
        public function getStatusCode() { return 500;}
    }
}

namespace Vhost\Healthz {
    final class LivenessProbeHandler
    {
        public static function handle(): \Psr\Http\Message\ResponseInterface
        {
            return new \React\Http\Message\Response(\React\Http\Message\Response::STATUS_OK, ['Content-Type' => 'application/json'], '{"result":"healthy"}');
        }
    }
}

Applied Rules:

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Config rector.php

<?php

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

return RectorConfig::configure()
    // A. whole set
    ->withPreparedSets(typeDeclarations: true)
    // B. or few rules
    ->withRules([
        TypedPropertyFromAssignsRector::class
    ])
    // demonstrate specific PHP version
    ->withPhpVersion(PhpVersion::PHP_84);

Rector version: b855ff - released at 2026-01-22 19:37