MODX Snippet facebook Page Graph using API

fbPageGraph.php

<?php
//-----------------------------------------------------------
//  fbPageGraph
//-----------------------------------------------------------
/*
 * @author: Steeve from lawebfabric
 * @website: http://www.lawebfabric.com
 * @tutorial modx website: http://www.tutocms.fr/
 * @description: Returns the number of fans for a facebook fanpage (via the graph api)
 * @version 1.0.0 - 2018-11-22
 *
 * PROPERTIES
 * page_id - the facebook id of your fanpage
 * access_token - the app access token
 *
 * EXAMPLE USAGE
 * [[!fbPageGraph]] OR [[!fbPageGraph? &pageURL=`https://www.facebook.com/nike/`]]
 * 
 * ATTENTION
 * If you copy this to a new snippet in MODX you need to create 2 properties
 * access_token = access token from Facebook
 * https://developers.facebook.com/tools/explorer/ SELECT APP AND GET ACCESS TOKEN FOR THE APP
 * PAGEID?fields=cover,fan_count,picture.type(large),posts{created_time,description,full_picture,picture,message,is_published,is_expired,is_hidden,name,place,status_type,type},photos
 * PAGEID?fields=about,category,cover,description,emails,fan_count,hours,link,location,picture{url,is_silhouette,cache_key,height,width},phone,name,videos,website
 * PAGEID?fields=posts{created_time,description,full_picture,picture,message,is_published,is_expired,is_hidden,name,place,status_type,type}
 * page_id = you Facebook page ID you can find it here https://findmyfbid.com/
 * OR YOU CAN USE FACEBOOK PAGE URL like for Nike : https://www.facebook.com/nike/
 * FACEBOOK REFERENCE PAGE: 
 * https://developers.facebook.com/docs/graph-api/reference/page/
 * https://developers.facebook.com/docs/graph-api/reference/v3.2/page/feed
 *
 * fbPageGraph is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License as published by the Free Software
 * Foundation; either version 2 of the License, or (at your option) any later
 * version.
 *
 * fbPageGraph is distributed in the hope that it will be useful, but WITHOUT ANY
 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
 * A PARTICULAR PURPOSE. See the GNU General Public License for more details.
 *
 */

// Get the script properties page_id and access_token
// To get your Facebook page ID : https://findmyfbid.com/
$page_id        = $scriptProperties['page_id'];
// To get an access token from your APP : https://developers.facebook.com/tools/explorer/
$access_token   = $scriptProperties['access_token'];
// Get the script properties pageURL
$page_url       = $modx->getOption('pageURL', $scriptProperties);
if(!isset($page_url)){
    $page_url    = explode('/', $page_url);
    $page_url    = $page_url[3];
}

// Verify if page id is set in the snippet properties
if(empty($page_id) && !isset($page_url)) {
    $modx->log(modX::LOG_LEVEL_ERROR, '[fbPageLikes] missing required properties page_id OR script propertie pageURL!');
    return;
}
// Verify if access token is set in the snippet properties
if(empty($access_token)) {
    $modx->log(modX::LOG_LEVEL_ERROR, '[fbPageLikes] missing required properties access_token!');
    return;
}

if(empty($page_id)){
    $page_id = $page_url;
}

$url = 'https://graph.facebook.com/'.$page_id.'?access_token='.$access_token.'&fields=fan_count';

$curl = curl_init($url);
curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);   
curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);
$result = curl_exec($curl);  
curl_close($curl);
$data = json_decode($result,true);


return $data['fan_count'];