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

    public function block($messages, $type = null, $style = null, $prefix = ' ', $padding = false)
    {
        $messages = is_array($messages) ? array_values($messages) : array($messages);

        $this->autoPrependBlock();
        $this->writeln($this->createBlock($messages, $type, $style, $prefix, $padding, true));
        $this->newLine();
    }

 protected function execute(InputInterface $input, OutputInterface $output)
 {
     $this->io = new SymfonyStyle($input, $output);
     $this->sort = $input->getOption('sort');
     $this->sleepTime = $input->getOption('sleepTime');
     if (!$input->hasOption('sleepTime') && $output->getVerbosity() >= OutputInterface::VERBOSITY_NORMAL) {
         $this->sleepTime = 25;
     }
     // Transform milliseconds in microseconds for usleep()
     $this->sleepTime = $this->sleepTime * 1000;
     $this->numberOfCodesToGenerate = $input->getOption('amount');
     // The length of each outputted code
     $this->codeLength = $input->getOption('length');
     // All possible chars. By default, 'A' to 'Z' and '0' to '9'
     $this->possibleChars = str_split($input->getOption('characters'));
     $baseNumberOfChars = count($this->possibleChars);
     $this->possibleChars = array_unique($this->possibleChars);
     // If there's an error here, we'll say it later
     $maxPossibleNumberOfCombinations = pow(count($this->possibleChars), $this->codeLength);
     if ($maxPossibleNumberOfCombinations < $this->numberOfCodesToGenerate) {
         $this->io->error(sprintf('Cannot generate %s combinations because there are only %s combinations possible', number_format($this->numberOfCodesToGenerate, 0, '', ' '), number_format($maxPossibleNumberOfCombinations, 0, '', ' ')));
         return 1;
     } else {
         $this->io->block(sprintf('Generating %s combinations.', number_format($this->numberOfCodesToGenerate, 0, '', ' ')), null, 'info');
         if ($maxPossibleNumberOfCombinations > $this->numberOfCodesToGenerate) {
             $this->io->block(sprintf('Note: If you need you can generate %s more combinations (with a maximum of %s).', number_format($maxPossibleNumberOfCombinations - $this->numberOfCodesToGenerate, 0, '', ' '), number_format($maxPossibleNumberOfCombinations, 0, '', ' ')), null, 'comment');
         }
     }
     $this->io->block('Available characters:');
     $this->io->block(implode('', $this->possibleChars), null, 'info');
     $codesList = $this->doGenerate();
     $outputFile = $input->getOption('output');
     if ($outputFile) {
         $save = true;
         if (file_exists($outputFile)) {
             $save = $this->io->confirm(sprintf('File %s exists. Erase it?', $outputFile), false);
         }
         if ($save) {
             $this->io->block(sprintf('Output results to %s', $outputFile), null, 'info');
             if (!file_put_contents($outputFile, implode("\n", $codesList))) {
                 throw new \Exception(sprintf('Could not write to %s...', $outputFile));
             }
         }
     } else {
         $this->io->text($codesList);
     }
     if ($baseNumberOfChars !== count($this->possibleChars)) {
         $this->io->warning(sprintf('We detected that there were duplicate characters in "%s", so we removed them.', $input->getOption('characters')));
     }
     return 0;
 }