Replace the Double not operator (!!) by type-casting to boolean
-$bool = !!$var;
+$bool = (bool) $var;
Configure your rector.php
:
<?php
use Rector\CodeQuality\Rector\BooleanNot\ReplaceMultipleBooleanNotRector;
use Rector\Config\RectorConfig;
return RectorConfig::configure()
->withRules([
ReplaceMultipleBooleanNotRector::class,
]);