Send GCM Notification from PHP - php

Question

I am trying to send GCM notification using php. The script runs fine if I hard code the values and I do receive the notification as well. But when I try to pass the value as input, it fails with error:
{
"multicast_id":8013504586085987118,
"success":0,
"failure":1,
"canonical_ids":0,
"results":[
{
"error":"InvalidRegistration"
}
]
}
Working Code:
<?php
// Replace with the real server API key from Google APIs
$apiKey = "Google Api Key";
// Replace with the real client registration IDs
$registrationIDs = array("Registerationid");
// Message to be sent
//$message = "Your message e.g. the title of post";
$msg = array
(
'message' => 'TestMessage',
'title' => 'TestTitle',
'subtitle' => 'TestSubtitle',
'tickerText' => 'TestTicker',
'vibrate' => 1,
'sound' => 1,
'largeIcon' => 'large_icon',
'smallIcon' => 'small_icon'
);
// Set POST variables
$url = 'https://android.googleapis.com/gcm/send';
$fields = array(
'registration_ids' => $registrationIDs,
'data' => array( "message" => $msg ),
);
$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);
?>
code throwing error
<?php
$registrationIDs = array( $_GET['id'] );
// Replace with the real server API key from Google APIs
$apiKey = "API KEY";
// Replace with the real client registration IDs
//$registrationIDs = array( $_GET['id'] );
// Message to be sent
//$message = "Your message e.g. the title of post";
$msg = array
(
'message' => 'TestMessage',
'title' => 'TestTitle',
'subtitle' => 'TestSubtitle',
'tickerText' => 'TestTicker',
'vibrate' => 1,
'sound' => 1,
'largeIcon' => 'large_icon',
'smallIcon' => 'small_icon'
);
// Set POST variables
$url = 'https://android.googleapis.com/gcm/send';
$fields = array(
'registration_ids' => $registrationIDs,
'data' => array( "message" => $msg ),
);
$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);
// print the result if you really need to print else neglate thi
echo $result;
//print_r($result);
//var_dump($result);
?>