Get ThemeForest theme statistics and information in simple PHP script

ThemeForestThemeStatisticsAndInformation.php

<?php
/**
 * ThemeForest specific theme information with Theme details, Total Sell Count, Total Comments, etc..
 *
 * encouraged by @sohelrana820 & @aislamfaisal on a chitchat
 *
 * @autho: Shaharia Azam <shaharia.azam@gmail.com>
 * @url: https://blog.shaharia.com
 *
 *
 * @param null $themeUrl
 * @return int
 */

function loadDom($themeUrl)
{
    $ch = curl_init($themeUrl);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    $html = curl_exec($ch);
    curl_close($ch);

    $dom = new DOMDocument();
    @$dom->loadHTML($html);

    return new DOMXPath($dom);
}

function getInfo($themeUrl = null)
{
    $x = loadDom($themeUrl);
    //Sell count
    foreach ($x->query('//*[@class="sidebar-stats__number"]') as $node) {
        $possibleData[] = $node->nodeValue;
    }

    //Total Price
    foreach ($x->query('//*[@class="js-purchase-price"]') as $node) {
        $price[] = $node->nodeValue;
    }

    //Additional Info
    foreach ($x->query('//*[@class="meta-attributes__attr-detail"]') as $node) {
        $info[] = preg_replace('/\s+/', '', $node->nodeValue);
    }

    $y = loadDom($themeUrl . '/comments');

    foreach ($y->query('//*[@class="t-heading -size-s h-mb2"]') as $node) {
        $infoComment[] = preg_replace('/\s+/', '', $node->nodeValue);
    }

    $data = [
        'sellCount' => intval($possibleData[0]),
        'price' => $price[0],
        'created' => date('Y-m-d', strtotime($info[0])),
        'lastUpdated' => date('Y-m-d', strtotime($info[1])),
        'highResolution' => $info[2],
        'compatibleBrowsers' => $info[3],
        'filesIncluded' => $info[4],
        'columns' => $info[5],
        'documentation' => $info[6],
        'layout' => $info[7],
        'totalComment' => intval($infoComment[0])
    ];

    return $data;
}

//Provide your specific theme URL here
$themeUrl = "https://themeforest.net/item/car-house-car-dealer-template/17628233";
print_r(getInfo($themeUrl));

hi i run this code in my local php nut i will get a lot of error Undefined variable: all of the line why can you help me please!!!!:(((