Custom XML feed

Custom XML feed for WooCommerce VARIABLE products. Create PHP file inside Root of WP, Access that file via filename.php?action=whatever.

<?php
require_once('wp-load.php');

//die;
$query_args = array(
  'post_type' => 'product_variation',
  'post_status' => 'publish',
  'posts_per_page' => '-1',
  'meta_query' => array(
    '0' => array(
      'key' => '_stock',
      'value' => '1',
      'compare' => '>=',
    ),
    'relation' => 'AND',
  ),
);

if (!empty($_GET['action'])) {

  $query_args = array(
    'post_type' => 'product_variation',
    'post_status' => 'publish',
    'posts_per_page' => '4975',

    'meta_query' => array(
      '0' => array(
        'key' => '_stock',
        'value' => '1',
        'compare' => '>=',
      ),
      'relation' => 'AND',
    ),
  );
}
// The Query
$the_query = new WP_Query($query_args);
$xml = new SimpleXMLElement('<xml/>');
// The Loop
if ($the_query->have_posts()) {
  while ($the_query->have_posts()) {
    
    $the_query->the_post();
    $product = wc_get_product(get_the_ID());

    $parent = wc_get_product($product->get_parent_id());
    $track = $xml->addChild('product');
    $track->addChild('SKU', $product->get_sku());
    $track->addChild('ID', $product->get_id());
    $track->addChild('maat', $product->get_attribute('maten'));
    $track->addChild('kleur', $parent->get_attribute('kleuren'));
    $track->addChild('materiaal', $parent->get_attribute('materiaal'));
    $track->addChild('afbeeldingslink', wp_get_attachment_url($product->get_image_id()));
    $afb = $track->addChild('extra_afbeeldingslinks');
    
    $x = 0;
    foreach ($parent->get_gallery_image_ids() as $id) {
      $x++;
      $afb->addChild('afbeelding_' . $x, wp_get_attachment_url($id));
    }

    $track->addChild('titel', $product->get_name());
    $track->addChild('beschrijving', htmlentities($parent->get_description(), ENT_XML1));
    $track->addChild('extra_beschrijving', htmlentities($parent->get_short_description(), ENT_XML1));
    $track->addChild('plateauhoogte', $parent->get_attribute('plateauhoogte'));
    $track->addChild('hakhoogte', $parent->get_attribute('hakhoogte'));
    $track->addChild('type_hak', $parent->get_attribute('haksoort'));
    $track->addChild('Rits', $parent->get_attribute('rits'));
    $track->addChild('Plateau_in_cm', $parent->get_attribute('plateauhoogte'));
    $track->addChild('Neussoort', $parent->get_attribute('neussoort'));
    $track->addChild('prijs', $product->get_regular_price());
    $track->addChild('sale_prijs', $product->get_sale_price());
    $track->addChild('staat', "Nieuw");
    $track->addChild('Beschikbaarheid', "Op voorraad");
    $track->addChild('MPN', $product->get_sku());
  }
  $count = $the_query->post_count;

  Header('Content-type: text/xml');
  print($xml->asXML());

  wp_reset_postdata();
} else {

}
?>