Get Account User Id FBML

I'm new to the faceboo开发者_如何学Ck app making and I'm just wondering how I can get the user who enabled the app (the one using it)'s user id.

Thanks

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Like this:

$facebook = new Facebook('API', 'SECRET');
echo $facebook->user;

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The new PHP SDK is available here: http://github.com/facebook/php-sdk. It has an example that shows how to get the user id and profile: http://github.com/facebook/php-sdk/blob/master/examples/example.php.