GCM PHP : Field "data" must be a JSON array - php

Question

I do know there are several posts here which talks about my issue but none works for me.Its either incomplete solution mentioned or left as is.
My query:
I am getting
Field "data" must be a JSON array: [{"sound":1,"vibrate":1,"message":"Push Notification Message","title":"Push Notification Title"}]
error when trying to use GCM. My regID, Sender ID, and server key looks fine.
May know how to resolve this.
PHP Code:
<?php
$to="";
if($_GET['id']){
$to = $_GET['id'];
}
$title="Push Notification Title";
$message="Push Notification Message";
sendPush($to,$title,$message);
function sendPush($to,$title,$message)
{
// API access key from Google API's Console
// replace API
define( 'API_ACCESS_KEY', 'API_HIDDEN');
$registrationIds = array($to);
$msg = array
(
'message' => $message,
'title' => $title,
'vibrate' => 1,
'sound' => 1
// you can also add images, additionalData
);
$fields = array
(
'registration_ids' => $registrationIds,
'data' => array($msg),
);
$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 );
echo $result;
}
?>

Answer 1

Replace the line
$message="Push Notification Message";
by
$message=array( 'response' => json_encode("Push Notification Message"));
GCM requires the response data in JSONArray format.
OR Use below method
function sendGoogleCloudMessage( $data, $ids ) {
$apiKey = 'YOUR_KEY';
$url = 'https://android.googleapis.com/gcm/send';
$post = array(
'registration_ids' => $ids,
'data' => $data,
);
$headers = array(
'Authorization: key=' . $apiKey,
'Content-Type: application/json'
);
$ch = curl_init();
curl_setopt( $ch, CURLOPT_URL, $url );
curl_setopt($ch, CURLOPT_IPRESOLVE, CURL_IPRESOLVE_V4 );
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( $post ) );
$result = curl_exec( $ch );
if ( curl_errno( $ch ) ) {
$result = $result . 'GCM error: ' . curl_error( $ch );
}
curl_close( $ch );
return $result;
}
and call it using
$response = array();
$response["title"] = "title";
$response["message"] = "Notification message.";
$data = array( 'response' => json_encode($response));
$result = sendGoogleCloudMessage($data, $ids);
It is working in my application.
Hope it'll help.