Generate invoices command

exampleCommand.php

<?php

namespace Example\BackBundle\Command;

use Symfony\Bundle\FrameworkBundle\Command\ContainerAwareCommand;
use Symfony\Component\Console\Input\InputArgument;
use Symfony\Component\Console\Input\InputInterface;
use Symfony\Component\Console\Input\InputOption;
use Symfony\Component\Console\Output\OutputInterface;


class ValidateOrdersCommand extends ContainerAwareCommand {

    protected function configure() {
        $this
            ->setName('invoices:generate')
            ->setDescription('Generate the Invoices')
            ->addOption(
                'month',
                'd',
                InputOption::VALUE_OPTIONAL,
                'The month to generate invoices for',
                date('Y-m')
            )
        ;
    }

    protected function execute(InputInterface $input, OutputInterface $output)
    {
        $month = $input->getOption('month');
        $res = $this->getContainer()->get('some.manager')->generateInvoices($month, $after);

        $output->writeln("<comment>$res</comment> <info>invoices were generated!</info>");
    }
}