ANorwell/gist:957889

## gistfile1.php
<?php

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

// Create our Application instance (replace this with your appId and secret).
$facebook = new Facebook(array(
'appId'  => '',
'secret' => '',
'cookie' => true,
));

// We may or may not have this data based on a $_GET or $_COOKIE based session.
//
// If we get a session here, it means we found a correctly signed session using
// the Application Secret only Facebook and the Application know. We dont know
// if it is still valid until we make an API call using the session. A session
// can become invalid if it has already expired (should not be getting the
// session back in this case) or if the user logged out of Facebook.
$session = $facebook->getSession();

$me = null;
// Session based API call.
if ($session) {
    try {
        $uid = $facebook->getUser();
        $me = $facebook->api('/me');
    } catch (FacebookApiException $e) {
        error_log($e);
    }

 }

// login or logout url will be needed depending on current user state.
if ($me) {
$logoutUrl = $facebook->getLogoutUrl();
} else {
$loginUrl = $facebook->getLoginUrl();
}

?>

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml"
      xmlns:fb="http://www.facebook.com/2008/fbml">
  <head>

    <!-- the facebook login button -->

    <?php if ($me): ?>
    <a href="<?php echo $logoutUrl; ?>">
      <img src="http://static.ak.fbcdn.net/rsrc.php/z2Y31/hash/cxrz4k7j.gif">
    </a>
    <?php else: ?>
    <div id="fb-root"></div>
    <script src="http://connect.facebook.net/en_US/all.js#appId=208341082530964&amp;xfbml=1"></script>
    <fb:login-button width="200" max-rows="1"></fb:login-button>
    <script type="text/javascript">
      window.fbAsyncInit = function() {
    FB.init({
        appId   : APP_ID,
                session : SESSION_JSON, // don't refetch the session when PHP already has it
                status  : true, // check login status
                cookie  : true, // enable cookies to allow the server to access the session
                xfbml   : true // parse XFBML
                });

    // whenever the user logs in, we refresh the page
    FB.Event.subscribe('auth.login', function() {
            window.location.reload();
        });
};
    </script>
    <?php endif ?>
	<?php

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

	// Create our Application instance (replace this with your appId and secret).
	$facebook = new Facebook(array(
	'appId' => '',
	'secret' => '',
	'cookie' => true,
	));

	// We may or may not have this data based on a $_GET or $_COOKIE based session.
	//
	// If we get a session here, it means we found a correctly signed session using
	// the Application Secret only Facebook and the Application know. We dont know
	// if it is still valid until we make an API call using the session. A session
	// can become invalid if it has already expired (should not be getting the
	// session back in this case) or if the user logged out of Facebook.
	$session = $facebook->getSession();

	$me = null;
	// Session based API call.
	if ($session) {
	try {
	$uid = $facebook->getUser();
	$me = $facebook->api('/me');
	} catch (FacebookApiException $e) {
	error_log($e);
	}

	}

	// login or logout url will be needed depending on current user state.
	if ($me) {
	$logoutUrl = $facebook->getLogoutUrl();
	} else {
	$loginUrl = $facebook->getLoginUrl();
	}

	?>

	<!DOCTYPE html>
	<html xmlns="http://www.w3.org/1999/xhtml"
	xmlns:fb="http://www.facebook.com/2008/fbml">
	<head>

	<!-- the facebook login button -->

	<?php if ($me): ?>
	<a href="<?php echo $logoutUrl; ?>">
	<img src="http://static.ak.fbcdn.net/rsrc.php/z2Y31/hash/cxrz4k7j.gif">
	</a>
	<?php else: ?>
	<div id="fb-root"></div>
	<script src="http://connect.facebook.net/en_US/all.js#appId=208341082530964&xfbml=1"></script>
	<fb:login-button width="200" max-rows="1"></fb:login-button>
	<script type="text/javascript">
	window.fbAsyncInit = function() {
	FB.init({
	appId : APP_ID,
	session : SESSION_JSON, // don't refetch the session when PHP already has it
	status : true, // check login status
	cookie : true, // enable cookies to allow the server to access the session
	xfbml : true // parse XFBML
	});

	// whenever the user logs in, we refresh the page
	FB.Event.subscribe('auth.login', function() {
	window.location.reload();
	});
	};
	</script>
	<?php endif ?>