Login with JS and then using PHP SDK (Facebook)

I'm using this code to login my websi开发者_如何学Cte via facebook:

<div id="fb-root"></div>
<script src="http://connect.facebook.net/en_US/all.js"></script>
<script>
     FB.init({ 
            appId:'MYAPPID', cookie:true, 
            status:true, xfbml:true 
     });
</script>
<fb:login-button>Login with Facebook</fb:login-button>

Its working well and I see my application on facebook.com/editapps.php, but then when I want to start using PHP SDK I see that I didn't login. If I login via PHP SDK then I see that I logged in.. What is the problem here? Thank you.

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What version of PHP SDK are you using? Because the latest 3.0.1 isn't compatible yet with javascript SDK. So you would need to downgrade to version 2 of the SDK until they will update the Javascript SDK too.

More info about this here: http://developers.facebook.com/blog/post/503/