unknown enums

<?php

require_once(realpath(__DIR__).'/../vendor/autoload.php');


$client = new Amp\Artax\Client;

use Amp\Artax\Notify;

$callback = function($update) {
    switch ($update['request_state']) {
        case(Notify::SOCK_PROCURED): {
            $message = "Notify::SOCK_PROCURED";
            break;
        }
        case(Notify::SOCK_DATA_IN): {
            $message = "Notify::SOCK_DATA_IN";
            break;
        }
        case(Notify::SOCK_DATA_OUT): {
            $message = "Notify::SOCK_DATA_OUT";
            break;
        }

        case(Notify::RESPONSE_HEADERS): {
            $message = "Notify::RESPONSE_HEADERS";
            break;
        }
        case(Notify::RESPONSE_BODY_DATA): {
            $message = "Notify::RESPONSE_BODY_DATA";
            break;
        }
        case(Notify::RESPONSE): {
            $message = "Notify::RESPONSE";
            break;
        }
        case(Notify::REDIRECT): {
            $message = "Notify::REDIRECT";
            break;
        }



        default: {
            $message = "Unknown state ".$update['request_state'];
        }
    }

    echo $message."\n";

};

for ($x=0 ; $x<1 ; $x++) {

    $randomWord = md5(md5(time()).$x);

    $request = "http://www.bing.com/search?q=".$randomWord;

    //echo $request."\n";
    $promise = $client->request($request);


    $promise->watch(new \Amp\Artax\Progress($callback));
    $response = $promise->wait();
    /** @var $response \Amp\Artax\Response */
    $previous = $response;

    while ($previous) {
        echo "URI: ".$previous->getRequest()->getUri()."\n";
        $previous = $previous->getPreviousResponse();
    }
}


/*

Notify::SOCK_PROCURED
Notify::SOCK_DATA_IN
Unknown state 16
Unknown state 32
URI: http://www.bing.com/search?q=827eeab72f39541ed5f3125249a99adf

*/