Google Cloud Messaging registration id expiration

Question

I am using Google Cloud Messaging for my Android application and I am trying to understand when the registration id expires. From this post I was able to understand that Goo

Answer 1

To obtain the latest GCM ID Here is my work around.

$result = curl_exec($ch);
$result = json_decode($result, true);
$GCMIDChanged = $result['canonical_ids'];
if($GCMIDChanged)
{
    $NewGCMId = $result['results'][0]['registration_id'];
    //Update your DB with $NewGCMId
}

In the above code, I am checking whether the canonical_ids exists in the result.

If the canonical_ids exists then i am getting the new registration_id

So, Now the system will update automatically the New Gcm Id whenever it is changed.

Update :

The below code can be used if the GCM Id is changed multiple times

$GCMIDChanged = $result['canonical_ids'];
if($GCMIDChanged)
{
    $NewGCMIdList = end($result['results']);
    $NewGCMId =  $NewGCMIdList['registration_id'];
}