PHP将图像从URL上传到Facebook

Question

  

可能重复：
  PHP - Upload a web hosted photo to facebook album via Graph API

我知道您可以使用此代码上传到用户相册

$facebook = new Facebook(array(  
  'appId'  => 'ID',  
  'secret' => 'SECRET',  
  'fileUpload' => true,  
  'cookie' => true // enable optional cookie support  
));  


$facebook->setFileUploadSupport(true);  

# File is relative to the PHP doc  
$file = "@".realpath("../../_images/stuff/greatness.jpg");  

$args = array(  
    'message' => 'Photo Caption',  
    "access_token" => "urtoken",  
    "image" => $file  
);  


$data = $facebook->api('/ALBUMID_GOES_HERE/photos', 'post', $args);
if ($data) print_r("success");

现在这总是从我的服务器上传，是否有可能facebook从外部网址http://www.test.com/image.jpg获取图片而不是使用我的服务器上传？