no_deferred.php

<?php

require_once './vendor/autoload.php';

abstract class Element
{
	protected $loop;
	public $active = false;

	public function __construct(\React\EventLoop\LoopInterface $loop)
	{
		$this->loop = $loop;
	}

	abstract public function synchronize();
}

class A extends Element
{

	public function synchronize()
	{
		$this->active = true;
		echo 'Processing A ...'.PHP_EOL;
		for ($i = 1; $i <= 7; $i++) {
			echo date('H:i:s').'| $A: '.$i.PHP_EOL;
			sleep(1);
		}
		echo 'Finished processing A ...'.PHP_EOL;
		$this->active = false;
	}
}

class B extends Element
{
	public function synchronize()
	{
		$this->active = true;
		echo 'Processing B ...'.PHP_EOL;
		for ($i = 1; $i <= 5; $i++) {
			echo date('H:i:s').'| $B: '.$i.PHP_EOL;
			sleep(1);
		}
		echo 'Finished processing B ...'.PHP_EOL;
		$this->active = false;
	}
}

class Test
{
	protected $loop;
	public $a;
	public $b;

	public function __construct()
	{
		$this->loop = React\EventLoop\Factory::create();
		$this->deferred = new \React\Promise\Deferred();
		$this->promise = $this->deferred->promise();

		$this->a = new A($this->loop);
		$this->b = new B($this->loop);
	}

	public function run()
	{
		$that = $this;

		$this->loop->addPeriodicTimer(1, function ($timer) {
			echo '.'.PHP_EOL;
		});

		$this->loop->addTimer(5, function ($timer) use ($that) {
			echo 'run a'.PHP_EOL;
			$that->a->synchronize();
		});
		$this->loop->addTimer(3, function ($pTimer) use ($that) {
			echo 'run b'.PHP_EOL;
			$that->b->synchronize();
		});

		$this->loop->addTimer(6, function ($pTimer) use ($that) {
			echo 'run b once more'.PHP_EOL;
			$that->b->synchronize();
		});

		$this->loop->run();
	}
}

$test = new Test();
$test->run();

output_log.txt

.
.
run b
Processing B ...
13:58:27| $B: 1
13:58:28| $B: 2
13:58:29| $B: 3
13:58:30| $B: 4
13:58:31| $B: 5
Finished processing B ...
.
.
run a
Processing A ...
13:58:33| $A: 1
13:58:34| $A: 2
13:58:35| $A: 3
13:58:36| $A: 4
13:58:37| $A: 5
13:58:38| $A: 6
13:58:39| $A: 7
Finished processing A ...
run b once more
Processing B ...
13:58:40| $B: 1
13:58:41| $B: 2
13:58:42| $B: 3
13:58:43| $B: 4
13:58:44| $B: 5
Finished processing B ...
.
.