DatabaseActivity.php

<?php

declare(strict_types=1);

namespace App\Workflows\Database;

use Workflow\Activity;

class DatabaseActivity extends Activity
{
    public function execute()
    {
        return [
            SimpleActivity::class,
            SimpleActivity::class,
            SimpleActivity::class,
        ];
    }
}

DatabaseWorkflow.php

<?php

declare(strict_types=1);

namespace App\Workflows\Database;

use Workflow\ActivityStub;
use Workflow\Workflow;

class DatabaseWorkflow extends Workflow
{
    public function execute()
    {
        $activities = yield ActivityStub::make(DatabaseActivity::class);

        foreach ($activities as $activity) {
            yield ActivityStub::make($activity);
        }
    }
}

SimpleActivity.php

<?php

declare(strict_types=1);

namespace App\Workflows\Database;

use Workflow\Activity;

class SimpleActivity extends Activity
{
    public function execute()
    {
        return 'activity';
    }
}