Facebook graph api comments pagination - php

Question

I'm trying to get all the comments of post by using the following api url request:
$fb->get($yourPage.'/feed?fields=comments.limit(100)&limit=25&since=2017-7-01&until=2017-7-31', $accessToken);
But some posts have more than 500 comments which yields pagination '(next)' in the api response. Now I want to retrieve all the comments, so how do I paginate through the "comments" because I know how to paginate through posts through this code:
$response = $fb->get($yourPage.'/feed?fields=comments.limit(500)&limit=25&since=2017-7-01&until=2017-7-31', $accessToken);
$comments = $response->getGraphEdge();
$totalcomments = array();
if ($fb->next($comments)) {
//Do something if there is pagination in the posts
}
So how do I do the same for comments? I've searched alot on stack and google but no questions point to this... Thanks

Answer 1

Each comments object includes a paging object for that:
{
"comments": {
"data": [
{
"created_time": "2017-09-01T12:06:19+0000",
"from": {
"name": "xxx",
"id": "1234"
},
"message": "xxx",
"id": "1234"
},
...
],
"paging": {
"cursors": {
"before": "NzkZD",
"after": "NzgZD"
},
"next": "https://graph.facebook.com/v2.10/cccccc/comments?access_token=xxx&pretty=0&limit=2&after=NzgZD"
}
},
"id": "xxx"
}
For every post you get, you need a subroutine (for example, with a recursive function) to use the "next" parameter in a separate API call to get all comments.