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: \"Attempt to assign property \"type\" on null\"\nRun Rector with \"--debug\" option and post the report here: https://github.com/rectorphp/rector/issues/new", "file": "/var/www/storage/demo/ekrnrxeclj1u3dqc8t0x/rector_analyzed_file.php", "line": 97 } ] }

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

PHP snippet to change

<?php

    function getRandomData(): array
    {
        return array_map(fn (): int => random_int(1, 100), range(0, 23));
    }

Config rector.php

<?php

declare(strict_types=1);

use Rector\Config\RectorConfig;
use Rector\TypeDeclaration\Rector\FuncCall\AddArrayFunctionClosureParamTypeRector;

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

Rector version: 6a3101 - released at 2026-02-10 12:09