function engagement_get_posts_json($id, $since = 0, $until = 0) { $page = new Page($id); $params = array(); $url = '/' . $id . '/posts?'; $params = array(); if ($since != '0' && $since != 0) { $params[] = 'since=' . $since; } if ($until != '0' && $until != 0) { $params[] = 'until=' . $until; } $url .= implode('&', $params); $res = $page->get_posts_from_fb($url); return json_encode($res); }