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 DemoFile
 {
-    private bool $isConstructed = false;
+    private bool $isConstructed = true;
     
     public mixed $value = null {
     	get {

     	mixed $value = null,
     ) {
         $this->value = $value;
-    	$this->isConstructed = true;
     }
 }

PHP snippet to change

<?php

final class DemoFile
{
    private bool $isConstructed = false;
    
    public mixed $value = null {
    	get {
        	return $this->value;
        }
        set {
        	if (!$this->isConstructed) {
            	$this->value = $value;
            }
            if (!is_string($value)) {
            	throw TypeError('$value must be a string when it is already constructed!');
            }
            $this->value = $value;
        }
    }
    
    public function __construct(
    	mixed $value = null,
    ) {
        $this->value = $value;
    	$this->isConstructed = true;
    }
}

Applied Rules:

InlineConstructorDefaultToPropertyRector

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\TypeDeclaration\Rector\Property\TypedPropertyFromAssignsRector;
use Rector\CodeQuality\Rector\Class_\InlineConstructorDefaultToPropertyRector;
use Rector\ValueObject\PhpVersion;

return RectorConfig::configure()
    // A. whole set
    ->withPreparedSets(typeDeclarations: true)
    // B. or few rules
    ->withRules([
        InlineConstructorDefaultToPropertyRector::class,
    ])
    // demonstrate specific PHP version
    ->withPhpVersion(PhpVersion::PHP_84);

Rector version: 64ba1b - released at 2026-02-27 00:03