facebook php, how do you use results paging?

Question

Hello i am using the Facebook PHP SDK (v.3.1.1)

I don't understand how to use the results paging url.

I want to get a list of ALL my friends, here is my code

$friends = $fb->api('/me/friends');
/*  
$friend == Array
(
    [data] => Array
    (
       ...
    ),
    [paging] => Array
    (
        [next] => https://graph.facebook.com/me/friends?method=GET&access_token=SOMETHING&limit=5000&offset=5000
    )
*/
if (!empty($friends['paging']['next']))
{
    $friends2 = $fb->api($friends['paging']['next']);
    //doesn't work
}

Answer 1

All of the previous responses are valid.

Here is the way I do, to get all the "next" result with the Graph API:

Note that I don't get "previous" results.

function FB_GetUserTaggedPhotos($user_id, $fields="source,id") {
    $photos_data = array();
    $offset = 0;
    $limit = 500;

    $data = $GLOBALS["facebook"]->api("/$user_id/photos?limit=$limit&offset=$offset&fields=$fields",'GET');
    $photos_data = array_merge($photos_data, $data["data"]);

    while(in_array("paging", $data) && array_key_exists("next", $data["paging"])) {
        $offset += $limit;
        $data = $GLOBALS["facebook"]->api("/$user_id/photos?limit=$limit&offset=$offset&fields=$fields",'GET');
        $photos_data = array_merge($photos_data, $data["data"]);
    }

    return $photos_data;
}

You can change the value of $limit as you want, to get less/more data per call.