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:

 
     public function resolve($key)
     {
-        if (isset($this->items[$key])) {
-            return $this->items[$key];
-        }
-
-        return $this->items[$key] = 'default';
+        return $this->items[$key] ?? $this->items[$key] = 'default';
     }
 }

PHP snippet to change

<?php

class MemoizedIndex
{
    public $items = [];

    public function resolve($key)
    {
        if (isset($this->items[$key])) {
            return $this->items[$key];
        }

        return $this->items[$key] = 'default';
    }
}

Applied Rules:

IfIssetToCoalescingRector

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\Php70\Rector\StmtsAwareInterface\IfIssetToCoalescingRector;

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

Rector version: e4cb24 - released at 2026-06-25 18:47