Command/CliCommand.php
protected function executeTasks(InputInterface $input, OutputInterface $output, $data)
    {
        foreach ($this->tasks as $taskId) {
            $task = TaskContainer::create($taskId, $this);

            // Failed to execute task.
            if ($task && !$this->executeTask($task, $input, $output, $data)) {
                return static::RETURN_ERROR;
            }
        }

        return static::RETURN_SUCCESS;
    }
protected function executeTasks(InputInterface $input, OutputInterface $output, $data)
    {
        foreach ($this->tasks as $taskId) {
            $task = TaskContainer::create($taskId, $this);

            // Failed to execute task.
            if ($task && !$this->executeTask($task, $input, $output, $data)) {
                return static::RETURN_ERROR;
            }
        }

        return static::RETURN_SUCCESS;
    }
Execute tasks.

@param InputInterface $input
Input.
@param OutputInterface $output
Output.
@param array $data
Prepared data.

@return boolean
True or False.