当使用RESTapi从PHP发送数据时，Android设备没有收到通知

我收到了我的设备的GCM注册令牌，但当我使用来自PHP的RESTapi发送消息时，它显示Success，但没有在设备上收到消息。php代码

<?php 
 $data = array( 'message' => 'Hello World! First Message from PHP' );
 $ids = 'device registration token';
 // Send a GCM push
 sendGoogleCloudMessage(  $data, $ids );
function sendGoogleCloudMessage( $data, $ids )
{
// Insert real GCM API key from Google APIs Console
// https://code.google.com/apis/console/        
$apiKey = 'API Key'; //(server API Key)
// Define URL to GCM endpoint
$url = 'https://gcm-http.googleapis.com/gcm/send';
// Set GCM post variables (device IDs and push payload)     
$post = array(
                'to'  => $ids,
                'data'              => $data,
                );
// Set CURL request headers (authentication and type)       
$headers = array( 
                    'Authorization: key=' . $apiKey,
                    'Content-Type: application/json'
                );
// Initialize curl handle       
$ch = curl_init();
// Set URL to GCM endpoint      
curl_setopt( $ch, CURLOPT_URL, $url );
// Set request method to POST       
curl_setopt( $ch, CURLOPT_POST, true );
// Set our custom headers       
curl_setopt( $ch, CURLOPT_HTTPHEADER, $headers );
// Get the response back as string instead of printing it       
curl_setopt( $ch, CURLOPT_RETURNTRANSFER, true );
// Set JSON post data
curl_setopt( $ch, CURLOPT_POSTFIELDS, json_encode( $post ) );
// Actually send the push   
$result = curl_exec( $ch );
// Error handling
if ( curl_errno( $ch ) )
{
    echo 'GCM error: ' . curl_error( $ch );
}
// Close curl handle
curl_close( $ch );
// Debug GCM response       
echo $result;
print_r($result);
}
?>

当提交PHP文件时，它返回如下消息，似乎消息显示"成功"，但在设备上没有收到消息。有人能建议我是否需要采取额外措施或做错什么吗？

{"multicast_id":8550022549195779350,"success":1,"failure":0,"canonical_ids":0,"results":[{"message_id":"0:1459795352923689%21f96bfff9fd7ecd"}]}