Clear cache from Controller in Symfony2

gistfile1.php

<?php
    // asume controller context here
    public function cccAction()
    {
        $kernel = $this->get('kernel');
        $application = new \Symfony\Bundle\FrameworkBundle\Console\Application($kernel);
        $application->setAutoExit(false);
        $options = array('command' => 'cache:clear',"--env" => 'prod', '--no-warmup' => true);
        $application->run(new \Symfony\Component\Console\Input\ArrayInput($options));
        return new Response();
    }
?>

I'm trying to run this from within a command (not a controller), but it keeps clearing the dev cache, in spite of specifying '--env' => 'prod' in the options array. Symfony 2.8.

crearing dev

My solutions are:
exec("php bin/console cache:clear --env=prod");
or

$fs = new Filesystem();
$fs->remove($this->getParameter('kernel.cache_dir'));