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Google cloud messaging with PHP

Google Cloud Messaging for Android (GCM) is a free service that allows you to send data from your server to your users’ Android device, and also to receive messages from devices on the same connection.

GCM allows data provider servers to send messages to their Android applications. GCM simply passes message data to application, app receives data now application has full control of how to handle it. For example, the application might post a notification, display a custom user interface, or silently sync data. It requires devices running Android 2.2 or higher that also have the Google Play Store application installed. Good news is to test this developer do not require device, we can test it from emulator also however emulator should run on Android 2.2.


How to send GCM using PHP?

1. Create project on GCMand define API key in PHP file.

 * Google API Key
define("GOOGLE_API_KEY", "BIzaSyCRLa4LQZWNQBcRCYcIVYA45i9i8zfClqc"); // Place your Google API Key

2. Create a class to send message

class GCM {
 //put your code here
 // constructor
 function __construct() {
 * Sending Push Notification
 public function send_notification($message) {
 // Set POST variables
 $url = '';
 $fields = array(
 'data' => $message,
 $headers = array(
 'Authorization: key=' . GOOGLE_API_KEY,
 'Content-Type: application/json'
 // Open connection
 $ch = curl_init();
 // Set the url, number of POST vars, POST data
 curl_setopt($ch, CURLOPT_URL, $url);
 curl_setopt($ch, CURLOPT_POST, true);
 curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
 curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
 // Disabling SSL Certificate support temporarly
 curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
 curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($fields));
 // Execute post
 $result = curl_exec($ch);
 if ($result === FALSE) {
 die('Curl failed: ' . curl_error($ch));
 // Close connection
 echo $result;

3. Include class in you project and start sending notification to Android devices

if (isset($_GET["message"])) {
 $message = $_GET["message"];
 $gcm = new GCM();
 $result = $gcm->send_notification($message);
 echo $result;