How can I get a user authenticated in my page tab

Question 1

I found it's impossible to do with PHP SDK alone. I needed to combine the Javascript SDK and PHP SDK. I use the Javascript SDK to handle the Login, and the PHP SDK to get the user data and post to wall actions etc.

I found this example in the PHP SDK Git: https://github.com/facebook/facebook-php-sdk/blob/master/examples/with_js_sdk.php

<?php

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

$facebook = new Facebook(array(
'appId'  => '344617158898614',
'secret' => '6dc8ac871858b34798bc2488200e503d',
));

// See if there is a user from a cookie
$user = $facebook->getUser();

if ($user) {
  try {
    // Proceed knowing you have a logged in user who's authenticated.
    $user_profile = $facebook->api('/me');
  } catch (FacebookApiException $e) {
    echo '<pre>'.htmlspecialchars(print_r($e, true)).'</pre>';
    $user = null;
  }
}

?>
<!DOCTYPE html>
<html xmlns:fb="http://www.facebook.com/2008/fbml">
  <body>
    <?php if ($user) { ?>
      Your user profile is
      <pre>
        <?php print htmlspecialchars(print_r($user_profile, true)) ?>
      </pre>
    <?php } else { ?>
      <fb:login-button></fb:login-button>
    <?php } ?>
    <div id="fb-root"></div>
    <script>
      window.fbAsyncInit = function() {
        FB.init({
          appId: '<?php echo $facebook->getAppID() ?>',
          cookie: true,
          xfbml: true,
          oauth: true
        });
        FB.Event.subscribe('auth.login', function(response) {
          window.location.reload();
        });
        FB.Event.subscribe('auth.logout', function(response) {
          window.location.reload();
        });
      };
      (function() {
        var e = document.createElement('script'); e.async = true;
        e.src = document.location.protocol +
          '//connect.facebook.net/en_US/all.js';
        document.getElementById('fb-root').appendChild(e);
      }());
    </script>
  </body>
</html>

Question 2

unfortunately you can't use PHP to do that, since you have to redirect him to a new url on the same window, you have to use Java Script to access the active window.

if (!array_key_exists('oauth_token', $sdata)){

    //set loginURL and params to get Permissions
    $params = array( //offline acces needed to post to users wall (dunno why)
        'redirect_uri' => $my_url, //your redirect URI - facebook.com/yourpage/_appid
        'client_id' => $app_id[path],
        'scope' => 'email, publish_stream', //your permissions
    );
    $loginUrl = $facebook->getLoginUrl($params);

    echo "<script>

     top.location.href='".$loginUrl."';


    </script>";

}else{

     //if the user already authed send him here
    header ('location: nextfile.php');
}

How can I get a user authenticated in my page tab

How can I get a user authenticated in my page tab AND redirected to my page tab after authentication? (I do not wish to use my app as a standalone website).