title: how to set manage_pages permission to a particular facebook page?
body: <p>how i can set a manage_pages permission of my application to a particular page only. Now my application get permission to manage all pages of fb user.. How i can restrict this and get permission to access a specific page only ?</p>
  
  <p>I am using one simple authentication method.</p>
  
  <pre><code>$app_id     = 'xxxxxxxxxxxxx';
  $app_secret = 'xxxxxxxxxxxxxxxx';
  $my_url     = 'http://xxxxxxxxxxx.com/xxxx/facebook?client=params';
  
  $code        = $_REQUEST["code"];
  
  //auth user
  if(empty($code)) {
  $dialog_url = 'https://www.facebook.com/dialog/oauth?client_id=' 
                  . $app_id . '&amp;redirect_uri=' . urlencode($my_url).'&amp;scope=offline_access,read_stream,publish_stream,manage_pages';
                  echo("&lt;script&gt;top.location.href='" . $dialog_url . "'&lt;/script&gt;");
              }
  
  //get user access_token
  $token_url = 'https://graph.facebook.com/oauth/access_token?client_id='
              . $app_id . '&amp;redirect_uri=' . urlencode($my_url) 
              . '&amp;client_secret=' . $app_secret 
              . '&amp;code=' . $code;
  $access_token = file_get_contents($token_url);
  
  
  am using the above code for authentication. when i try to print the $_REQUEST params, i couldnt find any variable names 'signed_request'.  is any other method can we use with the above code..??
  </code></pre>