A way to easily clear symfony cache without wiping out absolutely everything from the cache/ENV directory.

symfony-cache-clear.php

<?php

class MyController extends Controller {

  public function myAction() {
    $finder = new Finder();
    /**
     * @var SplFileInfo $file
     */
    foreach($finder->name('*ProjectContainer*')->depth(0)->in($this->getParameter('kernel.cache_dir')) as $file){
      unlink($file->getRealPath());
    }
    $cache = $this->get('cache_warmer');
    $cache->enableOptionalWarmers();
    $cache->warmUp($this->getParameter('kernel.cache_dir'));
  }
}