$facebook->api('/me') not giving the user data - php

Question

require_once($_SERVER['DOCUMENT_ROOT'] . '/facebook-php-sdk/facebook.php');
$facebook = new Facebook(array(
'appId' => FB_MAIN_APP_API_ID,
'secret' => FB_MAIN_APP_SECRET
));
// Get User ID
$user = $facebook->getUser();
if ($user) {
try {
// Proceed knowing you have a logged in user who's authenticated.
$user_profile = $facebook->api('/me');
}catch (FacebookApiException $e) {
error_log($e);
$user = null;
}
}
Above is the code I'm using to get the Facebook details for my application. In my localhost this is working fine and it gives my Facebook email, user id. After I upload this in to live server this function is not working and it's not giving my Facebook details. I checked on the Facebook app id and it is the correct one.
I cannot figure out why it's not working in live site since it is working in my localhost. Please help me with this. Thank you.

Answer 1

I think problem is in your app which your are using on server. So try the same app which you are using for your localhost and in login and logout url instead of localhost use $_SERVER['HTTP_HOST'].
Example :
$session->fb_logout = $facebook->getLogoutUrl(array('next' => "http://" . $_SERVER['HTTP_HOST'] . "/path/to/logout"));
First check that what $user_profile = $facebook->api('/me'); showing. Just print_r the variable $user_profile.
Ex :
$user_profile = $facebook->api('/me');
print_r($user_profile);
exit;
if it showing blank then surely it will go in catch block. Then write following in catch block.
print_r($e);
exit;

Answer 2

For geting the user id, user need to grant permission
$user_id = $facebook->getUser();
echo $uid;
if($user_id){
try {
$user_profile = $facebook->api('/me');
} catch (FacebookApiException $e) {
error_log($e);
$user_id = null;
}
}else{
$login_url = $facebook->getLoginUrl();
echo("<br>login url=".$login_url);
};
After the user grant permission check the login_url, you may access user id.
Try this

Answer 3

Have you checked you have the correct URL in the configuration of your app in Facebook?
I have this piece of code to my FB apps and work properly, could you try it?
$session = $this->facebook->getUser();
if ($session) {
$logoutUrl = $this->facebook->getLogoutUrl();
try {
$data['uid'] = $this->facebook->getUser();
$me = $this->facebook->api($session);
$data['me'] = $me;
} catch (FacebookApiException $e) {
error_log($e);
}
} else {
$loginUrl = $this->facebook->getLoginUrl(
array(
'scope' => 'publish_stream, user_about_me, email',
'redirect_uri' => 'YOUR URL',
'canvas' => 1,
'fbconnect' => 0,
'display' => 'page',
));
}
if (!$session) {
echo "<script type='text/javascript'>top.location.href = '$loginUrl';</script>";
exit;
}
$this->load->view('MY VIEW', $data);