bool hasArgument(string|int $name) Determine if the given argument is present

void error(string $string, null|int|string $verbosity = null) Write a string

string|array argument(string $key = null) Get the value of a command argument

int run(InputInterface $input, OutputInterface $output) Run the console

$this description(string $description) Set the human-friendly description

int call(string $command, array $arguments = array()) Call another console

void run(Container $container)

void info(string $string, null|int|string $verbosity = null) Write a string

Application class Application extends Application implements

bool hasOption(string $name) Determine if the given option is present.