Facebook graph API returning null values - php

Question

My Facebook login works perfectly in my localhost, but when I uploaded it to a web server, it can't fetch any data from the users.
I can only get their facebook id, but the other infos are null or blank.
I think the facebook login works, because they got redirected to the $redirect_url that I initialized.
$app_id = "******";
$app_secret = "*******";
$redirect_url = "localhost/sample/";
try
{
$facebook = FacebookSession::setDefaultApplication($app_id,$app_secret);
$helper = new FacebookRedirectLoginHelper($redirect_url);
$sess = $helper -> getSessionFromRedirect();
}
catch(Exception $e)
{
}
if(!isset($sess))
{
//facebook login button
echo '<div class="fb"> <i class="fa fa-facebook"></i>Sign in with Facebook</div>';
}
else
{
$request = new FacebookRequest($sess,'GET','/me');
$response = $request->execute();
$graph = $response->getGraphObject(GraphUser::classname());
$fb_id = $graph ->getId(); //this is the only data that i can get
$fname = $graph ->getFirstName();
$lname = $graph ->getLastName();
$gender = $graph ->getGender();
echo 'name: '.$fname.' '.$lname.' gender: '.$gender; // these are null or ''
$_SESSION['fb_session'] = $sess;
}
I already got my permission approved.
This is an fb account that i created.
As it shown above, I think I'm not breaking any rules since I'm only fetching the info from the agreed permission.

Answer 1

It looks like FB requires that you include the Graph version in your request. Also, why not add some checks in the exceptions to see if it's a Graph issue or FB SDK. Also, is the user authenticating and you're just not getting their data, or are they not authenticating either?
Here is a snip that I've used and is on the FB Graph auth docs:
$fb = new Facebook\Facebook([
'app_id' => '{app-id}',
'app_secret' => '{app-secret}',
'default_graph_version' => 'v2.2',
]);
$helper = $fb->getRedirectLoginHelper();
try {
$accessToken = $helper->getAccessToken();
} catch(Facebook\Exceptions\FacebookResponseException $e) {
// When Graph returns an error
echo 'Graph returned an error: ' . $e->getMessage();
exit;
} catch(Facebook\Exceptions\FacebookSDKException $e) {
// When validation fails or other local issues
echo 'Facebook SDK returned an error: ' . $e->getMessage();
exit;
}
This will also let it grab it's redirect_url for you from the app that you have registered with them.