问推送通知出错

EN

<?php
require_once 'vendor/autoload.php';
use UrbanAirship\Airship;
use UrbanAirship\Push as P;

$airship = new Airship("key", "secret");
$response = $airship->push()
    ->setAudience(P\deviceToken(""))
    ->setNotification(P\notification("Hello from php!"))
    ->setDeviceTypes(P\all)
    ->send();

print "Push sent!. Push IDs:" . $response.push_ids;