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:

         
         $this->map(
             $array, 
-            fn($item) => var_dump(
-                $item,
+            var_dump(
+                ...,
             )
         );
     }

PHP snippet to change

<?php

final class DemoFile
{
    public function run(): void
    {
        $array = [1, 2, 3];
        
        $this->map(
            $array, 
            fn($item) => var_dump(
                $item,
            )
        );
    }
    
    private function map(array $items, callable $callback): void {
		foreach($items as $i) {
        	$callback($i);
        }
    }
}

Applied Rules:

FunctionLikeToFirstClassCallableRector

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\CodingStyle\Rector\FunctionLike\FunctionLikeToFirstClassCallableRector;

return RectorConfig::configure()
    ->withRules([
        FunctionLikeToFirstClassCallableRector::class
    ]);

Rector version: 3cf1f5 - released at 2025-11-22 15:10