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:

 <?php
 
 final class DemoFile

         $this->compareArrays($orig, $new);
     }
 
+    /**
+     * @param mixed|mixed $array1
+     * @param mixed|mixed $array2
+     */
     private function compareArrays(array $array1, array $array2): void
     {
         foreach ($array1 as $key => $value1) {

PHP snippet to change

<?php

final class DemoFile
{
    public function run(string $orig, string $new) 
    {
        $orig = json_decode($content, true);
        $new = json_decode($content, true);
        
        $this->compareArrays($orig, $new);
    }

    private function compareArrays(array $array1, array $array2): void
    {
        foreach ($array1 as $key => $value1) {
            $value2 = $array2[$key];

            if (is_array($value1)) {
                $this->compareArrays($array1[$key], $array2[$key]);
                return;
            }

            if ($value1 !== $value2) {
                $this->diff[$key] = [
                    'existing' => $value1,
                    'new' => $value2,
                ];
            }
        }
    }
}

Applied Rules:

ClassMethodArrayDocblockParamFromLocalCallsRector

Not a change you expect?

Create an issue on GitHub
...or to speed up fix – add a test fixture

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: 9d02f9 - released at 2026-01-29 17:51