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:

 {
 }
 
-foo(b: null, a: 'test');
+foo(a: 'test');

PHP snippet to change

<?php

declare(strict_types=1);

function foo(string $a, $b = null)
{
}

foo(b: null, a: 'test');

Applied Rules:

Not a change you expect?

Config rector.php

<?php

use Rector\Config\RectorConfig;

return RectorConfig::configure()
    ->withPreparedSets(codeQuality: true, deadCode: true);

Rector version: d348b6 - released at 2026-05-26 23:50