<?php
    class FacebookHelper
    {
        private static $fb_check_endpoint = "https://graph.facebook.com";

        public static function checkToken($inputToken){
            $client = new GuzzleHttp\Client(['base_uri' => self::$fb_check_endpoint]);
            $params = [
                "access_token" => getenv("FB_ACCESS_TOKEN"),
                "input_token" => $inputToken
            ];
            $body = $client->request("GET", "debug_token", [ 'query' => $params ])->getBody();
            return json_decode($body, TRUE);
        }
    }
?>