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: \"Call to a member function isNull() on null\"\nRun Rector with \"--debug\" option and post the report here: https://github.com/rectorphp/rector/issues/new", "file": "/var/www/storage/demo/x2omz0elqq6xpu433x4x/rector_analyzed_file.php", "line": 120 } ] }

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

PHP snippet to change

<?php

class NotZeroPosition
{
    public function go()
    {
        $this->run([], ['item1', 'item2']);
    }

    private function run(array $data, array $items)
    {
    }
}

Config rector.php

<?php

declare(strict_types=1);

use Rector\Config\RectorConfig;
use Rector\TypeDeclarationDocblocks\Rector\Class_\ClassMethodArrayDocblockParamFromLocalCallsRector;

return static function (RectorConfig $rectorConfig): void {
    $rectorConfig->rule(ClassMethodArrayDocblockParamFromLocalCallsRector::class);
};

Rector version: 3a3942 - released at 2026-03-17 17:46