edit: found a better solution
see the answer here: How to get the image from a facebook photo comment?
the query you want to perform is
/{page-post-id}/comments?fields=from,message,id,attachment,created_time,comments.fields(from,message,id,attachment,created_time)
to query this via PHP you would do something like this:
$page_comment_id = 12345; // put your id here $access_token = ''; // put your facebook access token here $url = 'https://graph.facebook.com/' . $page_comment_id . '/comments?fields=from,message,id,attachment,created_time,comments.fields(from,message,id,attachment,created_time)&access_token=' . $access_token; $data = json_decode(file_get_contents($url),true); print_r($data);