Android : How to Send notification to mobile devices from localhost wamp server using wifi connection?

I want to send notification to all mobile devices that are connected to the same WIFI point, the laptop is connected. Is it possible in php to detect the mobile devices connected to the WIFI and send notification as well as share the android apk package to all those connected android mobile device.

How to establish a communication between computer and android mobile device using wifi? And one important thing WIFI is only for local network environment [No Internet Connection Available]. How to achieve this using php?

Thanks in advance.