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:

 <?php
 
 final class DemoFile implements \Stringable

 {
     public function __toString(): string
     {
-        throw new \Exception('Not implemented');
+        throw new \Exception('Not implemented');
+        return '';
     }
 }

PHP snippet to change

<?php

final class DemoFile implements \Stringable
{
    public function __toString(): string
    {
        throw new \Exception('Not implemented');
    }
}

Applied Rules:

StringableForToStringRector

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;
use Rector\TypeDeclaration\Rector\Property\TypedPropertyFromAssignsRector;

return RectorConfig::configure()
    ->withRules([
        Rector\Php80\Rector\Class_\StringableForToStringRector::class
    ]);

Rector version: 2.2.14 - released at 2025-12-09 11:53