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 DemoFile
 {
-    private $prop;
+    private ?callable $prop = null;
     
     public function set(callable $prop): void
     {

PHP snippet to change

<?php

final class DemoFile
{
    private $prop;
    
    public function set(callable $prop): void
    {
        $this->prop = $prop;
    }

    private function reset(): void
    {
        $this->prop = null;
    }
}

Applied Rules:

TypedPropertyFromAssignsRector

Not a change you expect?

Create an issue on GitHub
...or to speed up fix – add a test fixture

Config rector.php

<?php

use Rector\Config\RectorConfig;

return RectorConfig::configure()
    // A. whole set
    ->withPreparedSets(typeDeclarations: true);

Rector version: e65ac6 - released at 2026-02-05 16:20