Exception when uploading photo with Facebook Graph API - php

Question

I would like to upload a photo to facebook for a user in the default album for an application. This is described under publishing here:
http://developers.facebook.com/docs/reference/api/photo
The method has been answered here: How can I upload photos to album using Facebook Graph API. I am using the following:
$args = array(
'message' => 'Photo Caption',
'image' => '#'.realpath("image.png")
);
$data = $facebook->api('/me/photos', 'post', $args);
However I get the exception "(#324) Requires upload file" when I attempt this. I have a valid session and I have the publish_stream and user_photos permissions. I can retrieve data using the API. The image file is definitely valid because it can be loaded with file_get_contents(realpath("image.png")).
I've tried this solution, using curl, which works perfectly:
Upload Photo To Album with Facebook's Graph API
$args = array(
'message' => 'Photo from application',
'pic.png' => '#'.realpath('pic.png')
);
$tok = $session['access_token']
$url = 'http://graph.facebook.com/'.$album_id.'/photos?access_token='.$tok;
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_HEADER, false);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, $args);
$data = curl_exec($ch);
Compared with Facebook's PHP SDK curl which looks like this (using the same $args and $url):
$ch = curl_init();
$opts = self::$CURL_OPTS;
$opts[CURLOPT_POSTFIELDS] = http_build_query($args, null, '&');
$opts[CURLOPT_URL] = $url;
curl_setopt_array($ch, $opts);
$data= curl_exec($ch);
Why doesn't the PHP version work? Looks like the http_build_query() function is interfering with loading the image. I don't know enough about curl to understand what's going on here.

Answer 1

I'm so glad I went trough the same problem
You have to set the fileUpload param to true !
$facebook = new Facebook(array(
'appId' => $facebookapi_id,
'secret' => $facebookapi_secret,
'fileUpload' => true,
'cookie' => true
));

Answer 2

Facebook have intentionally transformed the POST fields to a GET string using http_build_query() to stop fields beginning with # being used to accidentally or maliciously to upload files. Here's the GitHub issue.
A quick fix for this is to remove the http_build_query() from src/facebook.php in the SDK:
$opts[CURLOPT_POSTFIELDS] = http_build_query($params, null, '&');
Becomes:
$opts[CURLOPT_POSTFIELDS] = $params;
However if you do this you should take action to filter user generated messages that start with #. For example you could add a space to the front of each message.

Answer 3

If you use graph api to upload the photo it will getting the error (#200) User must have accepted TOS.
However if you use old rest api, just changing the url to https://api.facebook.com/method/photos.upload?access_token=xXXXXXXXXXXX if you use above example.