I am currently building a SNS for both web and iphone/android applications.
When an user writes on the wall or leaves a message, the server needs to push notifications to all related users. Users who are logged in on PC will receive it via Socket.io and those who are logged in on iPhone or android apps will get it via GCM/APN.
What is the best way to send push notification(GET) to all these users from a php web server?
cURL seems to do the right work but is extremely slow on my server. The web server will need to send notifications to at least 3 different servers at once at unnoticeable speed.