Send GCM notifications to multiple devices using PHP

Question

I need to send GCM notifications to multiple devices. Here i made PHP code to get the array of Registration ID from MySql and tried to send notification to multiple devices but there is some problem here.

My PHP Code:

<?php 
if($_SERVER['REQUEST_METHOD']=='GET'){

$tags  = $_GET['tags'];
 $api_key = 'My OWN API KEY';   

//Getting registration token we have to make it as array 

//Getting the message 
$message = Testing GCM';
$title= 'Cuboid';
$vibrate= '1';
$sound= '1';


require_once('dbConnect.php');

$user_ids = array();

       foreach ($_REQUEST['tags'] as $key => $val) {
       $user_ids[$key] = filter_var($val, FILTER_SANITIZE_STRING);
        }
        $tagss = "'" . implode("','", $user_ids) . "'";
           $sql = "SELECT user_tags.user_id AS userID , gcm_token.regtoken AS regToken
                   FROM user_tags,gcm_token
                    WHERE tags IN ({$tagss}) AND user_tags.user_id=gcm_token.user_id";


$r = mysqli_query($con,$sql);

 //creating a blank array 
 $result = array();
 $reg_token = array();


 //looping through all the records fetched

    while ($row = mysqli_fetch_array($r)) {
    $result['regToken'][] = $row['regToken'];   
      }

     //Displaying the array in json format 

     echo json_encode(array('result'=>$result));

     $reg_token = (json_encode(array('result'=>$result)));
     //$reg_token = array('result'=>$result);


     $msg = array
(
    'message'   => $message,
    'title'     => $title,
    'subtitle'  => 'Android Push Notification using GCM Demo',
    'tickerText'    => 'Ticker text here...Ticker text here...Ticker text here',
    'vibrate'   => $vibrate,
    'sound'     => $sound,
    'largeIcon' => 'large_icon',
    'smallIcon' => 'small_icon'
);

//Creating a new array fileds and adding the msg array and registration token array here 
$fields = array
(
    'registration_ids'  => $reg_token,
    'data'          => $msg
);

//Adding the api key in one more array header 
$headers = array
(
    'Authorization: key=' . $api_key,
    'Content-Type: application/json'
); 

//Using curl to perform http request 
$ch = curl_init();
curl_setopt( $ch,CURLOPT_URL, 'https://android.googleapis.com/gcm/send' );
curl_setopt( $ch,CURLOPT_POST, true );
curl_setopt( $ch,CURLOPT_HTTPHEADER, $headers );
curl_setopt( $ch,CURLOPT_RETURNTRANSFER, true );
curl_setopt( $ch,CURLOPT_SSL_VERIFYPEER, false );
curl_setopt( $ch,CURLOPT_POSTFIELDS, json_encode( $fields ) );

//Getting the result 
$results = curl_exec($ch );
curl_close( $ch );

//Decoding json from results 
$res = json_decode($results);

      mysqli_close($con);
    }

Answer 1

Update:

As per the updated documentation the API endpoint to send push notification is changed from https://android.googleapis.com/gcm/send to https://fcm.googleapis.com/fcm/send

The older endpoint is still working but I'll recommend to use the latest one. This code remains the same for both the endpoints.

---

Try this, Declare a function to send notifications:

function sendfcmMessage($registrationIds, $msg)
{

    if (!defined('API_ACCESS_KEY')) define('API_ACCESS_KEY', '<PUT_YOUR_KEY_HERE>');
    $fields = array('registration_ids' => $registrationIds, 'data' => $msg, 'content-available' => 1, 'priority' => 'high'); //set priority as required
    $headers = array('Authorization: key=' . API_ACCESS_KEY, 'Content-Type: application/json');
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, 'https://android.googleapis.com/gcm/send');
    curl_setopt($ch, CURLOPT_POST, true);
    curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
    curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($fields));
    $result = curl_exec($ch);
    curl_close($ch);
    return $result;
}

The use it like this,

    $msg = array('message' => $message,
            'title' => $title, 
            'body' => $body,
            'subtitle' => $subtitle, 
            'tickerText' => $ticker_text, 
            'vibrate' => $vibrate, 
            'sound' => $sound, 
            'largeIcon' => 'large_icon', 
            'smallIcon' => 'small_icon');

    $registrationIds = array();

    while ($row = mysqli_fetch_array($r)) {
        array_push($registrationIdsIOS, $row['regToken'];);
    }

    sendfcmMessage($registrationIds, $msg);

You can also debug by printing the result of this function to know if notification was sent or not, it also lets you know why notification was not sent.

echo sendfcmMessage($registrationIds, $msg);

Answer 2

You must get result in JSON Array. Try the following code:

<?php

if($_SERVER['REQUEST_METHOD']=='GET'){

$tags  = $_GET['tags'];
// Replace with the real server API key from Google APIs
$apiKey = "YOUR_API_CODE";

$message = "Hello Raja";

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


require_once('dbConnect.php');

$user_ids = array();

       foreach ($_REQUEST['tags'] as $key => $val) {
       $user_ids[$key] = filter_var($val, FILTER_SANITIZE_STRING);
        }
        $tagss = "'" . implode("','", $user_ids) . "'";
           $sql = "SELECT user_tags.user_id AS userID , gcm_token.regtoken AS regToken
                   FROM user_tags,gcm_token
                    WHERE tags IN ({$tagss}) AND user_tags.user_id=gcm_token.user_id";

$r = mysqli_query($con,$sql);

$result = array();



 //looping through all the records fetched

  while ($row = mysqli_fetch_array($r)) {
    $result[] = $row['regToken'];   
}

 //Displaying the array in json format 

   //echo json_encode(array('result'=>$result));

     echo json_encode(($result));

            $registrationIDs = ($result);


    //echo json_encode(array('result'=>$result));


$fields = array(
    'registration_ids' => $registrationIDs,
    'data' => array( "message" => $message ),
);
$headers = array(
    'Authorization: key=' . $apiKey,
    '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);
//curl_setopt( $ch, CURLOPT_POSTFIELDS, json_encode( $fields));

curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
// curl_setopt($ch, CURLOPT_POST, true);
// curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode( $fields));

// Execute post
$result = curl_exec($ch);

// Close connection
curl_close($ch);
echo $result;
//print_r($result);
//var_dump($result);
      }

     ?>