<?php
use Spatie\Async\Pool;
use Illuminate\Support\Facades\Artisan;

require_once 'vendor/autoload.php';

$tasks = [
    'some:command',
    'other:command'
];

$pool = Pool::create();
foreach ($tasks as $task) {
    $pool->add(function () use($task) {
        Artisan::call($task);
        return $task;
    })->then(function ($output) {
        return $output;
    });
}
//
$pool->wait();