Extract product and category URLs from OpenCart Google Sitemap feed module

/* List all product and category URLs for an OpenCart website using the standard Google Sitemap feed */

<?php
$domain = "https://www.example.com/" ; // Replace with your actual domain name
$base   = "index.php?route=feed/google_sitemap" ;
$reqURL = $domain . $base ;
$html   = @file_get_contents ($reqURL) ;

if($html === FALSE)
{
  echo '<h1>Please make sure that Google Sitemap Feed is active and the URL is correct</h1>' ;
  die();
}

$DOM  = new DOMDocument() ;
$DOM->loadHTML($html) ;

/* Filter loc tags */
$rows = $DOM->getElementsByTagName("loc") ;

$i = 0 ;

echo "<pre>\n" ;

while(is_object($url = $DOM->getElementsByTagName("url")->item($i)))
{
  foreach($url->childNodes as $url)
  {
    if($url->nodeName=='loc')
    {
      echo $url->nodeValue . PHP_EOL ;
    }
  }
  $i++ ;
}
echo "</pre>\n" ;