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:

 {
     private function validateForm(array $formData): void
     {
-        $formData = array_map('trim', $formData);
+        $formData = array_map(trim(...), $formData);
     }
 }

PHP snippet to change

<?php

final class DemoFile
{
    private function validateForm(array $formData): void
    {
        $formData = array_map('trim', $formData);
    }
}

Applied Rules:

FirstClassCallableRector

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\Php81\Rector\Array_\FirstClassCallableRector::class
    ]);

Rector version: 2.5.4 - released at 2026-07-05 23:08