CreateUserCommand.php

<?php
// src/Command/CreateUserCommand.php

declare(strict_types=1);

namespace App\Command;

use App\Entity\User;

use Doctrine\ORM\EntityManagerInterface;
use Symfony\Component\Console\Command\Command;
use Symfony\Component\Console\Input\InputArgument;
use Symfony\Component\Console\Input\InputInterface;
use Symfony\Component\Console\Output\OutputInterface;

final class CreateUserCommand extends Command
{

    protected static $defaultName = 'app:create-user';

    /** @var EntityManagerInterface */
    private $entityManager;

    public function __construct(EntityManagerInterface $entityManager)
    {
        $this->entityManager = $entityManager;
        parent::__construct();
    }

    protected function configure(): void
    {
        $this
            ->setDescription('Creates a new user.')
            ->addArgument('username', InputArgument::REQUIRED, 'Username')
            ->addArgument('password', InputArgument::REQUIRED, 'User password')
            ->addArgument('role', InputArgument::OPTIONAL, 'Users role')
            ->setHelp('This command allows you to create a user...')
        ;
    }

    /**
     * @param InputInterface $input
     * @param OutputInterface $output
     * @return int|void|null
     * @throws \Exception
     */
    protected function execute(InputInterface $input, OutputInterface $output)
    {

        $username = $input->getArgument('username');
        $password = $input->getArgument('password');
        $role = $input->getArgument('role') ?? 'ROLE_USER';

        if (strlen($username) < 5) {
            $output->writeln('Username too short, length must be >= 5 !');
            return;
        }

        $userRepository = $this->entityManager->getRepository(User::class);
        $user = $userRepository->findOneBy(['username' => $username]);

        if ($user instanceof User) {
            $output->writeln('Username already taken!');
            return;
        }

        $user = new User($username, $password, [$role]);
        $this->entityManager->persist($user);
        $this->entityManager->flush();

        $output->writeln('User successfully generated!');
    }
}