code: protected function execute(InputInterface $input, OutputInterface $output)
      {
          $output->writeln('Clearing cache of type ' . get_class($this->cache));
  
          $this->cache->deleteAll();
  
          if (function_exists('opcache_reset')) {
              $output->writeln('Resetting opcache ' . phpversion('Zend OPcache'));
              opcache_reset();
          }
  
          return 0;
      }
docs: @param InputInterface  $input
  @param OutputInterface $output
  
  @return mixed