A Symfony Command

SomeCommand.php

<?php

// src/Command/SomeCommand.php
namespace App\Command;

use Symfony\Component\Console\Command\Command;
use Symfony\Component\Console\Input\InputInterface;
use Symfony\Component\Console\Output\OutputInterface;

class SomeCommand extends Command
{
    // the name of the command (the part after "bin/console")
    protected static $defaultName = 'app:some-command';

    private $projectRootDir;

    public function __construct($projectRootDir)
    {
        $this->projectRootDir = $projectRootDir;

        parent::__construct();
    }


    protected function configure()
    {
        // ...
    }

    protected function execute(InputInterface $input, OutputInterface $output)
    {
        // ...
        $output->writeln("The project's root directory is: " . $this->projectRootDir);
    }
}