How do I can post a multiple photos via Facebook API

Now I posting a single photo to wall like this:

$response = $facebook->api("/$group_id/photos", "POST", array(
    'access_token=' => $access_token,
    'message' => 'This is a test message',
    'url' => 'http://d24w6bsrhbeh9d.cloudfront.net/photo/agydwb6_460s.jpg',
   )
);

It works fine, but can I somehow post a multiple photos, something like this:

You can make batch requests as mentioned here: https://stackoverflow.com/a/11025457/1343690

But its simple to loop through your images and publish them directly.

foreach($photos as $photo)
{
       //publish photo
}

Edit:

(regarding grouping of photos on wall)

This grouping is done by facebook automatically if some photos are uploaded into the same album.

Currently you cannot create an album in a group via Graph API - it is not supported (as of now), see this bug.

But you can do this - create an album manually, then get the album_id by-
\GET /{group-id}/albums, then use the the code with album_id instead of group_id-

foreach($photos as $photo){
   $facebook->api("/{album-id}/photos", "POST", array(
      'access_token=' => $access_token,
      'name' => 'This is a test message',
      'url' => $photo
      )
   );
}

---

I've tested it, see the result-