How To Push From Php To Android?

How does WhatsApp, Facebook Messenger, Hike Messenger and Viber send push messages to the Android client?

I am using Autobahn Web Socket Android Client to receive push notifications from the Web Server. It is not consistent. I would like to know if this is the correct approach for push notifications. I know GC2M but there are limitations with it. Is it OK to use GCM?. What problems would I face in the future if I use it. I would like to know what everybody are actually using. What is everybody using for push. I want to implement mostly used and reliable push service. Please guide me in this. I have checked over the Internet about the Push Strategies used by those big apps like Facebook Messenger, Hike Messenger, WhatsApp and Viber but couldn't find out anything regarding it.
Answer:

sharing my answer about whatsApp, hope it will be helpful to understand large scale chat Applications.

Ravi Raj at Quora Visit the source

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