Question

This returns an array ordered in anti-chronological order. How do I specify an offset/limit for the query?

$photos = $facebook->api('me/photos');

Answer 1

The order is based on the created_time parameter check for yourself to validate

http://developers.facebook.com/tools/explorer/?method=GET&path=me%2Fphotos%3Ffields%3Dcreated_time%2Cupdated_time

The paging property at the end of every JSON response allows you to traverse the set.

"paging": {
    "previous": "https://graph.facebook.com/me/photos?fields=created_time\u00252Cupdated_time&value=1&redirect=1&limit=25&since=1341554766", 
    "next": "https://graph.facebook.com/me/photos?fields=created_time\u00252Cupdated_time&value=1&redirect=1&limit=25&until=1311564489"
  }

For example to get all the photos,

if($user_id) {
    $the_photos = array();

    $your_photos = $facebook->api("me/photos");

    while ($your_photos['data'])
    {
        $the_photos = array_merge( $the_photos, $your_photos['data'] );

        $paging = $your_photos['paging'];
        $next = $paging['next'];

        $query = parse_url($next, PHP_URL_QUERY);
        parse_str($query, $par);

        $your_photos = $facebook->api(
                "me/photos", 'GET', array(
                'limit' => $par['limit'],
                'until'  => $par['until'] ));
    }

    echo count($the_photos);
}

If you still don’t feel comfortable with this then just switch out and use offset and limit, they are allowed as paramaters as well. Increment the offset parameter with the limit on each traverse.