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 run()
     {
-        return PHP_VERSION_ID >= 80100 ? hash( 'xxh128', $value ) : hash( 'md4', $value );
+        return PHP_VERSION_ID >= 80100 ? hash( 'md5', $value ) : hash( 'md4', $value );
     }
     
     public function run_v()
     {
-        return version_compare( PHP_VERSION, '8.1', '>=' ) ? hash( 'xxh128', $value ) : hash( 'md4', $value );
+        return version_compare( PHP_VERSION, '8.1', '>=' ) ? hash( 'md5', $value ) : hash( 'md4', $value );
     }
 }

PHP snippet to change

<?php

final class DemoFile
{
    public function run()
    {
        return PHP_VERSION_ID >= 80100 ? hash( 'xxh128', $value ) : hash( 'md4', $value );
    }
    
    public function run_v()
    {
        return version_compare( PHP_VERSION, '8.1', '>=' ) ? hash( 'xxh128', $value ) : hash( 'md4', $value );
    }
}

Applied Rules:

DowngradeHashAlgorithmXxHashRector

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;
use Rector\DowngradePhp81\Rector\FuncCall\DowngradeHashAlgorithmXxHashRector;

return RectorConfig::configure()
    ->withRules([
        DowngradeHashAlgorithmXxHashRector::class
    ])
    ->withPhpVersion(PhpVersion::PHP_74);

Rector version: 3a0a66 - released at 2026-05-23 00:55