Try Rector Online | Rector - Automated Way to Instantly Upgrade and Refactor any PHP code

Rector run Failed:

{ "totals": { "changed_files": 0, "errors": 1 }, "errors": [ { "message": "System error: \"Cannot create PHPStan\\Type\\UnionType with: 0, float|int\"\nRun Rector with \"--debug\" option and post the report here: https://github.com/rectorphp/rector/issues/new", "file": "/var/www/storage/demo/k78w78o13kusu7orrhnv/rector_analyzed_file.php", "line": 70 } ] }

Run Rector on your code to see what it can do for you:

PHP snippet to change

<?php

final class DemoFile
{
    /**
     * @param array<PaymentPeriod> $arr
     */
    public function run(array $arr)
    {
        $sumCents = \array_reduce($arr, function ($carry, PaymentPeriod $paymentPeriod) : float|int {
            return $carry + $paymentPeriod->getSum();
        }, 0);
    }
}

interface PaymentPeriod {
    public function getSum() : float|null;
}

Config rector.php

<?php

use Rector\Config\RectorConfig;
use Rector\TypeDeclaration\Rector\Property\TypedPropertyFromAssignsRector;
use Rector\ValueObject\PhpVersion;

return RectorConfig::configure()
    ->withRules([
        \Rector\TypeDeclaration\Rector\FunctionLike\AddClosureParamTypeForArrayReduceRector::class
    ]);

Rector version: b855ff - released at 2026-01-22 19:37