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Facebook mobile login with PHP SDK
// Get User ID
$fb_id = $this->facebook->getUser();

// Get User Info
$user_profile = $this->facebook->api('/me');

// get mobile token
$fb_token = $this->input->post('fb_token');

$user_info = 'https://graph.facebook.com/me?access_token='.$fb_token;

facebook.request("me", new RequestListener() {
    @Override
    public void onComplete(String response, Object state) {}

    @Override
    public void onIOException(IOException e, Object state) {}

    @Override
    public void onFileNotFoundException(FileNotFoundException e, Object state) {}

    @Override
    public void onMalformedURLException(MalformedURLException e, Object state) {}

    @Override
    public void onFacebookError(FacebookError e, Object state) {}
});