Facebook Application Post to Wall

I want to post 开发者_运维问答some info along with an icon about my facebook app on the users Wall as soon as he give the permission. The app is created in iframe and I want to use Graph API. I have done this before but the facebook SDK recently changed.

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Something like:

$facebook = new Facebook(array(
    'appId'  => $appId, // YOUR APP ID
    'secret' => $apiSecret, // YOUR API SECRET
    'cookie' => true
));

$user = $facebook->getUser();

if($user) { 
    $attachment = array(
        'name' => 'NAME',
        'caption' => 'CAPTION',
        'link' => 'http://yourlink.com',
        'description' => 'DESCRIPTION',
        'picture' => 'http://yourlink.com/yourimage.jpg'
    );
    try { $result = $facebook->api('/me/feed/', 'post', $attachment); } catch (Exception $e) {  }
}