Server side code for GCM push notification in PHP
#php files and their role: 1. db_functions.php: contains Database manipulation functions. Automatically connects to the default database upon object creation. 2. db_functions_auth.php: contains Database functions to deal with authentication. 3. gcm_main.php: main php file which sends push notification upon form submission in index.php 4. index.php: A simple html form to submit message to be sent as push notification. 5. register.php: accessed from android device. It stores the registration ID sent from android client app. 6. unregister.php: unregisters an ID sent from android client app. 7. config.php: database configuration. 8. urls.php: Commonly used URLS. 9. commonutils.php: Commonly used functions. 10. validator.php: Form Validation functions.