Facebook app not worked?

I have made a page where I have write a code to check if user like our page or not.

require("./sdk/src/facebook.php"); $facebook = new Facebook(array(     'appId' => '324859924285629',     'secret' => '545443', ));  $user = $facebook->getUser();  var_dump($user); if ($user) {   try {     $likes = $facebook->api("/me/likes/526672940684211");      if( !empty($likes['data']) ){         echo "1";     }     else{         echo "0";     }   } catch (FacebookApiException $e) {     $user = null;   } }  if ($user) {   $logoutUrl = $facebook->getLogoutUrl(); } else {   $loginUrl = $facebook->getLoginUrl(array(     'scope' => 'user_likes'   )); } 

it's give me 0 user if I am not using Facebook from the ID I create my app.

Secondly when user invite the friends it's allow other to invite friend.

Now can This code work without permission. I means Can I check their like us or not by just place a sample app. Is they need permission or not.

Source: http://stackoverflow.com/questions/14301194/facebook-app-not-worked

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