setDefinition(array $definition) Sets the definition of the input.

string getName() Returns the canonical name of this helper.

string getDescription() Returns the description for the command.

class ProcessHelper extends Helper

string getVerticalBorderChar() Gets vertical border character.

class QuestionHelper extends Helper

bool isDebug() Returns whether verbosity is debug (-vvv).

int getExitCode() Gets the exit code.

class StreamOutput extends Output

write(string|array $messages, bool $newline = false, int $options) Writes a message to the output