fetch.php

<?php

$url = 'https://gist.githubusercontent.com/xnekv03/9dbe230b5dfb8c8b26912e02e92c563a/raw/443d364cfde02415ad994445b4d02b18718e94b0/sitemap.xml';

// tohle si urcis sam kam to ches ukladat
$destination = 'sitemap.xml';

$ch = curl_init($url);

curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);

$fileContent = curl_exec($ch);

if ($fileContent === FALSE) {
    die('cURL error: ' . curl_error($ch));
}


curl_close($ch);

file_put_contents($destination, $fileContent);