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 SkipParamHook
 {
-    public function __construct(private string $foo {
+    public function __construct(private readonly string $foo {
         get {
             return $this->foo;
         }

PHP snippet to change

<?php
final class SkipParamHook
{
    public function __construct(private string $foo {
        get {
            return $this->foo;
        }
    })
    {
    }
}

Applied Rules:

ReadOnlyPropertyRector

Not a change you expect?

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

Config rector.php

<?php

use Rector\Config\RectorConfig;
use Rector\ValueObject\PhpVersion;

return RectorConfig::configure()
    ->withRules([
        \Rector\Php81\Rector\Property\ReadOnlyPropertyRector::class
    ]);

Rector version: 142f1c - released at 2026-02-06 17:31