Webmozart\Console\Api\Args\Args::isArgumentSet PHP Méthode

    public function isArgumentSet($name)
    {
        return array_key_exists($name, $this->arguments);
    }

 /**
  * {@inheritdoc}
  */
 public function handle(Args $args, IO $io, Command $command)
 {
     $application = $command->getApplication();
     if ($args->isArgumentSet('command')) {
         $theCommand = $application->getCommand($args->getArgument('command'));
         $usage = new CommandHelp($theCommand);
     } else {
         $usage = new ApplicationHelp($application);
     }
     $usage->render($io);
     return 0;
 }