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:

// no change

PHP snippet to change

<?php

interface Foo {}
interface Bar {}

function name((Foo&Bar)|null $foo): string {
    return (string) $foo;
}

Config rector.php

<?php

use Rector\Config\RectorConfig;
use Rector\ValueObject\PhpVersion;

return RectorConfig::configure()
    ->withDowngradeSets(php81: true);

Rector version: 007114 - released at 2026-03-12 18:24