title: how to send push notifications to multiple users via php
body: <p>I am following this tutorial from androidhive. <a href="http://www.androidhive.info/2012/10/android-push-notifications-using-google-cloud-messaging-gcm-php-and-mysql/" rel="nofollow">http://www.androidhive.info/2012/10/android-push-notifications-using-google-cloud-messaging-gcm-php-and-mysql/</a></p>
  
  <p>Everything is working But The tutorial only shows how to send a push to ONE device at a time. I would like to send a push notification to all devices at once using the same method. I believe the way to do this is by editing the <code>send_message.php</code> But i'm still trying to understand how his method works.</p>
  
  <p>I have tried commenting and emailing the person who wrote the article but have not gotten a response. I just need someone to point me in the right direction.</p>
  
  <p>Any hints, guildance, answers, comments are much appreciated. </p>