vendor/illuminate/database/Console/Migrations/RollbackCommand.php

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<?php

namespace Illuminate\Database\Console\Migrations;

use Illuminate\Console\ConfirmableTrait;
use Illuminate\Database\Migrations\Migrator;
use Symfony\Component\Console\Input\InputOption;

class RollbackCommand extends BaseCommand
{
    use ConfirmableTrait;

    /**
     * The console command name.
     *
     * @var string
     */
    protected $name = 'migrate:rollback';

    /**
     * The console command description.
     *
     * @var string
     */
    protected $description = 'Rollback the last database migration';

    /**
     * The migrator instance.
     *
     * @var \Illuminate\Database\Migrations\Migrator
     */
    protected $migrator;

    /**
     * Create a new migration rollback command instance.
     *
     * @param  \Illuminate\Database\Migrations\Migrator  $migrator
     * @return void
     */
    public function __construct(Migrator $migrator)
    {
        parent::__construct();

        $this->migrator = $migrator;
    }

    /**
     * Execute the console command.
     *
     * @return void
     */
    public function handle()
    {
        if (! $this->confirmToProceed()) {
            return;
        }

        $this->migrator->setConnection($this->option('database'));

        $this->migrator->setOutput($this->output)->rollback(