ใครมีความรู้เรื่อง facebook sdk บ้างเข้ามาดูหน่อยครับ

$userPageId 	= $_POST["userpages"];
$userMessage 	= $_POST["message"];
$userID		= $fbuser;
	
	if(strlen($userMessage)<1) 
	{
		//message is empty
		$userMessage = 'No message was entered!';
	}
	
		//HTTP POST request to PAGE_ID/feed with the publish_stream
		$post_url = '/'.$userPageId.'/feed';
	
		//posts message on page statues 
		$msg_body = array(
		'message' => $userMessage
		);
	
	if ($fbuser) {
	  try {
		$postResult = $facebook->api($post_url, 'post', $msg_body );
	} catch (FacebookApiException $e) {
		echo $e->getMessage();
	  }
	}else{
	 $loginUrl = $facebook->getLoginUrl(array('redirect_uri'=>$homeurl,'scope'=>$fbPermissions));
	 header('Location: ' . $loginUrl);
	}

$msg_body = array(
'from' => $userID,
'message' => $userMessage
);