Question

I’m using the Facebook PHP SDK to register new users with data pulled from the Facebook API.

When I visit the page with the code below, the echo $uid returns nothing. Not 0. Not null. Just nothing.

The simplified code looks like this:

$config = array();
$config['appId'] = $appid;
$config['secret'] = $appsecret;
$config['fileUpload'] = false; // optional

$facebook = new Facebook($config);
$uid = $facebook->getUser();

$params = array(
  'scope' => 'read_stream, friends_likes',
  'redirect_uri' => 'http://www.website.com',
  'display' => 'page', //could be popup
  'cookie' => true,
);

$loginUrl = $facebook->getLoginUrl($params);

echo 'uid = '.$uid;

    if($uid) {
        //SHOW SOMETHIN'
        echo 'AUTHORIZED!';

        //CREATE NEW USER...
        //SIGN IN NEWLY CREATED USER...

    } else {
        //PROMPT TO AUTHORIZE
        echo '<a href="' . $loginUrl . '">SIGN IN WITH FACEBOOK.</a>';

    };

What am I missing?

Answer 1

get_permalink($post->ID) should be the culprit.

Is it the same you specified as Site URL in app settings ?

(My little wp knowledge says, this url is going to be dynamic)

For security reasons, facebook redirect to Site URL only and not just any url.