Facebook PHP SDK fails on first page load - php

Question

The FIRST time my index.php loads I get a value of 0 when calling:
$facebook->getUser();//returning 0 instead of id on first page load
The call works fine on any subsequent page load.
This is my code:
$facebook = new Facebook(array(
'appId' => $FB_APP_ID,
'secret' => $FB_APP_SECRET
));
$user_id = $facebook->getUser();//Returns 0 on first load.
Has anyone else experienced this? Maybe I should automatically reload the page if $facebook->getUser(); does not return a valid user?

Answer 1

May be it is not authenticating it for very first time, You can do some thing like this:
<?php
$facebook = new Facebook(array(
'appId' => xxx,
'secret' => xxx
));
$user_id = $facebook->getUser();
if($user_id) {
// We have a user ID, so probably a logged in user.
// If not, we'll get an exception, which we handle below.
try {
$me = $facebook->api('/me','GET');
echo "Name: " . $me['name'];
} catch(FacebookApiException $e) {
// If the user is logged out, you can have a
// user ID even though the access token is invalid.
// In this case, we'll get an exception, so we'll redirect and
// just ask the user to login again here.
$login_url = $facebook->getLoginUrl();
echo("<script>top.location.href = '" . $loginUrl . "';</script>");
}
} else {
// No user, redirect for the user to login
$login_url = $facebook->getLoginUrl();
echo("<script>top.location.href = '" . $loginUrl . "';</script>");
}
?>
EDIT:
If error persists, try with this edit, just change your this line:
$me = $facebook->api('/me','GET');
to this:
$me= $facebook->api('/'.$user_id, 'GET');
Hope this will solve your problem.