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 testResizeHeight(): void
     {
-        $this->createImage(width: 20, height: 40);
+        $this->createImage(width: '20', height: 40);
     }
     
     public function createImage(

PHP snippet to change

<?php
use PHPUnit\Framework\TestCase;

final class DemoTest extends TestCase
{   
    public function testResizeHeight(): void
    {
        $this->createImage(width: 20, height: 40);
    }
    
    public function createImage(
        string $content = 'content',
        int $width = 30,
        int $height = 50,
        int $resolution = 96
    ): void {
        
    }
}

Applied Rules:

ScalarArgumentToExpectedParamTypeRector

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\PHPUnit\CodeQuality\Rector\MethodCall\ScalarArgumentToExpectedParamTypeRector;

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

Rector version: 78e99a - released at 2026-06-05 21:27