Facebook PHP在“页面”选项卡中获取用户信息，重定向到登录后，getUser返回0

Question

I am trying to create a competition entry which checks to see if the user likes a page before entering. If they do, it will fetch their name, email and birthday for the competition entry details.

For some reason however, I cannot get my PHP code to work.

    <?php
    require 'src/facebook.php';

    // Create our Application instance (replace this with your appId and secret).
  $facebook = new Facebook(array(
    'appId'  => 'XXX',
    'secret' => 'XXXX',
  'cooke' => true
));

// Get User ID

$user = $facebook->getUser();

if ($user) {
  try {
    // Proceed knowing you have a logged in user who's authenticated.
    $me = $facebook->api('/me?fields=likes.target_id(215359398497970),birthday,first_name,last_name,email');
    if($me){
        $first_name = $me['first_name'];
        $last_name = $me['last_name'];
        $email = $me['email'];
        $dob = $me['birthday'];
        die($me);
    } else {
        $likes = false;
    }
  } catch (FacebookApiException $e) {
    die($e);
    error_log($e);
    $user = null;
  }
}

// Login or logout url will be needed depending on current user state.
if ($user) {
  $logoutUrl = $facebook->getLogoutUrl();
} else {
  $loginUrl = $facebook->getLoginUrl();
  //echo $loginUrl;
}
?>

For some reason, it gets stuck in a redirect loop because the loginURL doesn't seem to log my user in.

Answer 1

For anyone who's still looking. This is how I fixed my problem. I had to ensure that theis code was executed BEFORE any other code so I plonked it to the very top of my php file and it worked. I think the problem was that the headers had already been sent but I was unaware because my PHP warnings / errors are not enabled to show up.

Answer 2

I've encountered the same problem. I used an example project, and couldn't figure out why it keeps returning 0. tried nearly all related links here but none solved it.

The solution was to update Facebook's SDK files in the example project. Simple and easily missed,