React Promise + libuv fun!

composer.json

{
    "require": {
        "react/promise": "*@dev"
    }
}

uv.php

<?php

require(__DIR__ . '/vendor/autoload.php');

# From react/promise package
use React\Promise\Deferred;

function asyncSleep($seconds)
{
    $t = uv_timer_init();
    $d = new Deferred;

    uv_timer_start($t, $seconds * 1000, 0, [$d, 'resolve']);

    return $d->promise();
}

asyncSleep(2)->then(function() {
    echo "First\n";
    return asyncSleep(3);
})->then(function() {
    echo "Ready\n";
});

uv_run();