Symfony\Component\Console\Style\SymfonyStyle::progressAdvance PHP Method

    public function progressAdvance($step = 1)
    {
        $this->getProgressBar()->advance($step);
    }

 private function removeIssues(InputInterface $input)
 {
     $this->refreshJournal($input);
     $journalIssues = $this->em->getRepository('OjsJournalBundle:Issue')->findBy(['journal' => $this->journal]);
     $this->io->progressStart(count($journalIssues));
     foreach ($journalIssues as $issue) {
         $this->io->progressAdvance();
         $this->em->remove($issue);
     }
     $this->em->flush();
 }