Firebase Cloud Message

Sending a message with Firebase is very similar (if not exactly the same) as GCM apart from the endpoint.

Firebase Cloud Messaging has a server-side APIs that you can call to send messages. See https://firebase.google.com/docs/cloud-messaging/server.

Sending a message can be as simple as using curl to call a HTTP end-point. See https://firebase.google.com/docs/cloud-messaging/server#implementing-http-connection-server-protocol

curl -X POST --header "Authorization: key=<API_ACCESS_KEY>" --Header "Content-Type: application/json" https://fcm.googleapis.com/fcm/send -d "{\"to\":\"<YOUR_DEVICE_ID_TOKEN>\",\"notification\":{\"body\":\"Yellow\"},\"priority":10}"

PHP Example

Simple PHP script demonstrating the same:

$registrationId = "YOUR_DEVICE_ID_TOKEN";
$apiKey = "API_ACCESS_KEY";

$dataPayload = array(
    'notification' => array(
        'icon' => 'ic_utrofi_notification',
        'alert' => "ticker text 2", 
        'title' => "content title 2", 
        'body' => "body copy 2",
        'sound' => 'default'
));

$response = sendNotification( 
    $apiKey, 
    array($registrationId), 
    $dataPayload,
    null
);
echo $response;


////////////////////////////////////////////////////////////////////////////////
//  
//

/**
 * The following function will send a FCM notification using curl.
 * 
 * @param $apiKey               [string]    The Browser API key string for your GCM account
 * @param $registrationIdsArray [array]     An array of registration ids to send this notification to
 * @param $messageData          [array]     An named array of data to send as the notification payload
 */
function sendNotification( $apiKey, $registrationIdsArray, $customData, $notification  )
{
    $headers = array("Content-Type:" . "application/json", "Authorization:" . "key=" . $apiKey);
    $data = array(
        'registration_ids' => $registrationIdsArray,
    );
    if ($customData != null)    $data['data'] = $customData;
    if ($notification != null)  $data['notification'] = $notification;

    $post = json_encode($data);
    
    print( $post );

    $ch = curl_init();

    curl_setopt( $ch, CURLOPT_HTTPHEADER, $headers ); 
    curl_setopt( $ch, CURLOPT_URL, "https://fcm.googleapis.com/fcm/send" );
    curl_setopt( $ch, CURLOPT_SSL_VERIFYHOST, 0 );
    curl_setopt( $ch, CURLOPT_SSL_VERIFYPEER, 0 );
    curl_setopt( $ch, CURLOPT_RETURNTRANSFER, true );
    curl_setopt( $ch, CURLOPT_POSTFIELDS, $post );

    $response = curl_exec($ch);
    curl_close($ch);

    return $response;
}