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:

 
 final class SomeClass
 {
-    public function example($array = []) 
+    public function example(array $array = []): array 
     {
         return $array;
     }
 }

PHP snippet to change

<?php

final class SomeClass
{
    public function example($array = []) 
    {
        return $array;
    }
}

Applied Rules:

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Config rector.php

<?php

declare(strict_types=1);

use PHPStan\Type\ArrayType;
use PHPStan\Type\MixedType;
use Rector\Arguments\Rector\ClassMethod\ArgumentAdderRector;
use Rector\Arguments\ValueObject\ArgumentAdder;
use Rector\Config\RectorConfig;
use Rector\Set\ValueObject\SetList;

return static function (RectorConfig $rectorConfig): void {
    $arrayType = new ArrayType(new MixedType(), new MixedType());

    $rectorConfig
        ->ruleWithConfiguration(ArgumentAdderRector::class, [
            new ArgumentAdder('SomeClass', 'example', 0, 'array', [], $arrayType),
        ]);
    
   $rectorConfig->sets([
        SetList::TYPE_DECLARATION,
    ]);
};

Rector version: 540fbf - released at 2026-01-06 08:26