How to send data from php file to android file and use service when new data was inserted?

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http://stackoverflow.com – I want to use the function add proximity alerts and I have latitude and longitude. How can I said to the php file that when it gets new data it will send the data to an android file that will use the add proximity alerts function and will do notification to all the people who use the app and are in the 100 meter radius? (HowTos)