<?php

namespace App\MyWorkflow;

use Workflow\ActivityStub;
use Workflow\Workflow;

class MyWorkflow extends Workflow
{
    public function execute($name)
    {
        $result = yield ActivityStub::make(MyActivity::class, $name);

        return $result;
    }
}

<?php

namespace App\MyWorkflow;

use Workflow\Activity;

class MyActivity extends Activity
{
    public function execute($name)
    {
        return "Hello {$name}!";
    }
}

$workflow = WorkflowStub::make(MyWorkflow::class);
$workflow->start('World');