How to send Push Notifications using PHP / Google Android

Google Cloud Messaging (GCM) for Android is a service that allows you to send data from your server to your users’ Android-powered device, and also to receive messages from devices on the same connection. The GCM service handles all aspects of queueing of messages and delivery to the target Android application running on the target device, and it is completely free.

The only thing you will need is a Google_Api_key:

To create a Google API project:

  1. Open the Google Developers Console.
  2. If you haven’t created an API project yet, click Create Project.
  3. Supply a project name and click Create.Once the project has been created, a page appears that displays your project ID and project number. For example, Project Number: 670330094152.
  4. Copy down your project number. You will use it later on as the GCM sender ID.

To obtain an API key:

  1. In the sidebar on the left, select APIs & auth > Credentials.
  2. Under Public API access, click Create new key.
  3. In the Create a new key dialog, click Server key.
  4. In the resulting configuration dialog, supply your server’s IP address. For testing purposes, you can use0.0.0.0/0.
  5. Click Create.
  6. In the refreshed page, copy the API key. You will need the API key later on to perform authentication in your app server.

<?php

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */

/**
 * Description of GCM
 *
 * @author Ravi Tamada
 */
class GCM {

    //put your code here
    // constructor
    function __construct() {

    }

    /**
     * Sending Push Notification
     */
    public function send_notification($registatoin_ids, $message) {
        // include config
        include_once './config.php';

        // Set POST variables
        $url = 'https://android.googleapis.com/gcm/send';

        $fields = array(
            'registration_ids' => $registatoin_ids,
            '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
        curl_close($ch);
        echo $result;
    }

}

?>
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