symfony_async_controller.php

<?php

namespace AppBundle\Controller;

use Sensio\Bundle\FrameworkExtraBundle\Configuration\Route;
use Symfony\Bundle\FrameworkBundle\Controller\Controller;
use Symfony\Component\HttpFoundation\Request;
use Icicle\Coroutine\Coroutine;
use Icicle\Loop;
use Icicle\Awaitable;

class DefaultController extends Controller
{
    /**
     * @Route("/", name="homepage")
     */
    public function indexAction(Request $request)
    {

        $messages = array();

        $routine1 = new Coroutine($this->sayHello('Baby'));
        $routine2 = new Coroutine($this->sayHello('Ginger'));
        $routine3 = new Coroutine($this->sayHello('Posh'));
        $routine4 = new Coroutine($this->sayHello('Scary'));
        $routine5 = new Coroutine($this->sayHello('Sporty'));

        $messages[] = $routine1->wait();
        $messages[] = $routine2->wait();
        $messages[] = $routine3->wait();
        $messages[] = $routine4->wait();
        $messages[] = $routine5->wait();

        Loop\Run();

        // replace this example code with whatever you need
        return $this->render('default/index.html.twig', [
            'base_dir' => realpath($this->getParameter('kernel.root_dir').'/..'),
            'messages' => $messages
        ]);
    }

    public function sayHello($name){

        $delay = rand(1,5);
        $message = array("Hello! My name is " . $name, $delay);
        $promise = Awaitable\resolve($message);

        yield $promise->delay($delay);

    }

}