Google Cloud Messaging returns Invalid Registration - php

Question

When I am trying to send a gcm message through the below php, I get this error:
{"multicast_id":8958574426215974401,"success":0,"failure":1,"canonical_ids":0,"results":[{"error":"InvalidRegistration"}]}
However, the server API key is exactly what Google gave me to use, and the gcm_token is accurately being stored to my database. I do not know where the issue lies.
Here is my server side php:
<?php
require 'db_connect.php';
// API access key from Google API's Console
define( 'API_ACCESS_KEY', 'AIzaSyREST OF MY KEY' );
//insert the message into a database
$sql = "SELECT gcm_token FROM users WHERE user_id='1' LIMIT 1;";
// preform
if (!mysqli_query($Thesisdb, $sql)) {
printf("Errormessage: ", mysqli_error($Thesisdb));
mysqli_close($Thesisdb);
} else{
$results = mysqli_query($Thesisdb, $sql);
$registrationIds = array($results);
// prep the bundle
$msg = array
(
'message' => '$user',
'title' => 'This is a title. title',
'subtitle' => 'This is a subtitle. subtitle',
'tickerText' => 'Ticker text here...Ticker text here...Ticker text here',
'vibrate' => 1,
'sound' => 1,
'largeIcon' => 'large_icon',
'smallIcon' => 'small_icon'
);
$fields = array
(
'registration_ids' => $registrationIds,
'data' => $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

mysqli_query returns Boolen value (true or false) so this will not going to works directly.
we have to convert mysqli_query return values to array using fetch array, fetch assoc.
$results = mysqli_query($Thesisdb, $sql);
$registrationIds = array($results);
Code to combile all GCM Tokens.
registrationIds=array();
$sql="SELECT `user_id`,`push_notification_registration_id` FROM `tbl1` WHERE `user_status`='Active' AND `push_notification_registration_id`!=''";
$fire=mysqli_query($this->conn,$sql);
$users=array();
if( (isset($fire))&&(!empty($fire)) ){
while($result=mysqli_fetch_assoc($fire)){
array_push($users,$result);
}
}
foreach($users as $single_user){
$register_id=$single_user['push_notification_registration_id'];
array_push($registrationIds,$register_id);
}
$msg = array
(
'title' => $news_title,
'subtitle' => $news_description,
'tickerText' => 'Ticker Text',
'vibrate' => 1,
'sound' => 1,
'news_id' => $news_id,
'notification_type' => 'news'
);
$fields = array
(
'registration_ids' => $registrationIds,
'data' => $msg
);
$headers = array
(
'Authorization: key=' . YOUR_GOOGLE_API_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,true ) );
$result = curl_exec($ch );
curl_close( $ch );