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:

 
 final class SomeClass
 {
-    public function run($value)
+    public function run(int $value): void
     {
         $this->resolve($value);
     }
 
-    private function resolve(int $value)
+    private function resolve(int $value): void
     {
     }
 }

PHP snippet to change

<?php

final class SomeClass
{
    public function run($value)
    {
        $this->resolve($value);
    }

    private function resolve(int $value)
    {
    }
}

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