Sending push notification to multiple users android - php

Question

i am trying yo send a push notification to multiple users, when i do it for 1 user it work perfectly the problem come when i try to send the message to multiple users.
I got the response 200 MissingRegistration (So i supposed the problem is that i dont send the ID on the correct way)
Both ids are correct because if i send the message to both individually it works
This is my code
$gcmcodes=array("one user key","the other user key");
if(isset($_GET['mensaje'])) $message = $_GET['mensaje'];
$message2 = new gcm();
$message2->sendMessageToPhone(2, $message,$gcmcodes);
function sendMessageToPhone($collapseKey, $messageText, $gcmcodes)
{
$apiKey = 'My apikey';
$headers = array('Authorization:key=' . $apiKey);
$data = array(
'registration_ids' => $gcmcodes,
'collapse_key' => $collapseKey,
'data.message' => $messageText);
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, "https://android.googleapis.com/gcm/send");
if ($headers)
curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, $data);
$response = curl_exec($ch);
$httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
echo"<pre>";
var_dump($gcmcode,$response);
echo"</pre>";
if (curl_errno($ch)) {
return 'fail';
}
if ($httpCode != 200) {
return 'status code 200';
}
curl_close($ch);
return "mensaje mandado con exito";
}

Answer 1

The format you are using can only be used for sending a single notification at a time.
In order to send the notification to multiple registration IDs, you have to send a JSON request of the form :
{ "collapse_key": "something",
"time_to_live": 108,
"delay_while_idle": true,
"data": {
"message": "some message"
},
"registration_ids":["4", "8", "15", "16", "23", "42"]
}
Oh, and the reason you got MissingRegistration error is that when you use the plain text format, GCM expects a single Registration ID to be the value of the registration_id key (not registration_ids as you tried).