sending-push-notifications.php

<?php
    //Now, we have to send the temperature alert to registered users.
    //generic php function to send GCM push notification

   function sendPushNotificationToGCM($registration_ids, $message) {
        //Google cloud messaging GCM-API url
        $url = 'https://android.googleapis.com/gcm/send';
        $fields = array(
            'registration_ids' => $registration_ids,
            'data' => $message,
        );
        // Google Cloud Messaging GCM API Key
        define("API_KEY", "AIzaSyAURFJi4C_SMLxCiJvTcfKdLfnH0enA-WE");   // edit to add your API Key
        $headers = array(
            'Authorization: key=' . API_KEY,
            'Content-Type: application/json'
        );
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_POST, true);
        curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        curl_setopt ($ch, CURLOPT_SSL_VERIFYHOST, 0);
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
        curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($fields));
        $result = curl_exec($ch);
        if ($result === FALSE) {
            die('Curl failed: ' . curl_error($ch));
        }
        curl_close($ch);
        return $result;
    }
?>

<?php

    //this block is to receive the GCM regId from users and save them in the same MySQL database in the table 'regids'
    if(!empty($_GET["shareRegId"])) {
        $gcmRegID  = $_POST["regId"]; //App sends the GCM Reg ID through post, make sure you are on the same network for this.
        $server = 'localhost';
        $username = 'root';
        $password = 'raspberry';
        $database = 'templog';

        $conn = mysql_connect($server, $username, $password);
        $db = mysql_select_db($database);

        $command = "SELECT * FROM `regids` WHERE (`RegID` = '$gcmRegID');";
        $a = mysql_query($command);
        $r = mysql_num_rows($a);
        $s = "DELETE FROM `regids` WHERE (`RegID` = '');";
        if ($r) {
            echo "gcm-regID available in database"; // to prevent multiple registrations
        }
        else {
            $query = "INSERT INTO `regids` (`RegID`) VALUES ('$gcmRegID');";
            mysql_query($query);
            echo "done!";
        }
        mysql_query($s);
        mysql_close();
        exit;
    }

    //Code to get GCM RegIDs from the database and sending the alert
    $pushStatus = "";
    if(!empty($_GET["push"])) {
        $server = 'localhost';
        $username = 'root';
        $password = 'raspberry';
        $database = 'templog';
        //Connect to the database
        $conn = mysql_connect($server, $username, $password);
        $db = mysql_select_db($database);

        $query = "SELECT * FROM `regids`;";
        $result = mysql_query($query);
        $n = mysql_numrows($result);
        mysql_close();
        $RegistrationIDs = array();
        $i = 0;
        while ($i < $n) {
            $RegistrationIDs[$i] = mysql_result($result,$i,"RegID");
            $i++;
        }
        $pushMessage = $_GET["message"];
        $message = array("m" => $pushMessage);
        $pushStatus = sendPushNotificationToGCM($RegistrationIDs, $message);

        #This is just to help when you test your code to see if it is running properly
        echo $pushMessage;
        echo $pushStatus;
        echo json_encode($RegistrationIDs);
    }



?>