Souke/console/commands/ProducerDescriptionNl2brController.php

<?php

namespace console\commands;

use domain\Producer\Producer\ProducerModule;
use yii\console\Controller;

class ProducerDescriptionNl2brController extends Controller
{
    // ./yii producer-description-nl2br/apply
    public function actionApply()
    {
        $producerModule = ProducerModule::getInstance();

        foreach($producerModule->getRepository()->findProducers() as $producer) {
            $producer->description = nl2br($producer->description);
            $producer->save();
        }
    }
}

?>