amphp paralell tasks

<?php

use Amp\Deferred;
use Amp\Loop;
use function Amp\Promise\all;
use function Amp\Promise\wait;

Loop::run(function () {


    /**
     * Какая-то асинхронная функция, возвращает Promise
     */
    $fnWait = function($num, $sec){
        $deferred = new Deferred();

        Loop::delay($msDelay = $sec * 1000, function () use ($deferred, $num, $sec) {
            $result = "resolve $num task for $sec seconds" . PHP_EOL;
            echo $result;
            $deferred->resolve($result);
        });

        return $deferred->promise();
    };


    $arrArgs = [7,5,3,4,8];

    $promises = [];
    foreach ($arrArgs as $num => $args){
        $promises[] = $fnWait($num, $args);
    }

    $results = wait(all($promises));

    var_dump($results);

});