Symfony\Component\Finder\Finder::followLinks PHP Method

    public function followLinks()
    {
        $this->followLinks = true;

        return $this;
    }

 public function __construct()
 {
     $themes = Kernel::getService('em')->getRepository('RZ\\Roadiz\\Core\\Entities\\Theme')->findAll();
     $choices = [];
     $finder = new Finder();
     // Extracting the PHP files from every Theme folder
     $iterator = $finder->followLinks()->files()->name('config.yml')->depth(1)->in(ROADIZ_ROOT . '/themes');
     // And storing it into an array, used in the form
     foreach ($iterator as $file) {
         $data = Yaml::parse($file->getPathname());
         $classname = '\\Themes\\' . $data['themeDir'] . "\\" . $data['themeDir'] . "App";
         /*
          * Parsed file is not or does not contain any PHP Class
          * Bad Theme !
          */
         $choices[$classname] = $data['name'];
     }
     foreach ($themes as $theme) {
         if (array_key_exists($theme->getClassName(), $choices)) {
             unset($choices[$theme->getClassName()]);
         }
         if (array_key_exists(Kernel::INSTALL_CLASSNAME, $choices)) {
             unset($choices[Kernel::INSTALL_CLASSNAME]);
         }
     }
     $this->choices = $choices;
 }