Facebook graph API loop through paging
Your code works for me, the only thing that I did is to make sure that count($data["data"]) > 0 before merging it with the existing information. So it looks like this:
//loop through pages to return all results
while(in_array("paging", $data) && array_key_exists("next", $data["paging"])) {
$offset += $limit;
$data = $facebook->api("$fid/events/?limit=$limit&offset=$offset", $params);
// make sure we do not merge with an empty array
if (count($data["data"]) > 0){
$events_data = array_merge($events_data, $data["data"]);
} else {
// if the data entry is empty, we have reached the end, exit the while loop
break;
}
}}