/**
* Implements template_preprocess_input().
*/
function EXAMPLE_preprocess_input(&$variables) {
  if (isset($variables['attributes']['id'])) {
    if ($variables['attributes'][

/**
*  Implements template_preprocess_fieldset()
*/
function EXAMPLE_preprocess_fieldset(&$variables) {
  if (isset($variables['element']['#id'])) {
    $id = $variables['element']['#id']

/**
* Implements hook_preprocess_HOOK().
*/
function EXAMPLE_preprocess_page(&$variables) {
 $route_name = \Drupal::routeMatch()->getRouteName();
 if ($route_name == 'entity.user.canonical') {
   $current_user = \Drupal::currentUser();
   $roles = $current_user->getRoles();
   if

$nodes = $this->entityTypeManager->getStorage('node')->loadByProperties([
 'type' => 'product',
]);
foreach ($nodes as $node) {
 $node->delete();
}

/**
 * Import categories batch.
 */
public static function importCategories($arg1, $arg2, &$context) {
 $a = 1;
}
/**
 * {@inheritdoc}
 */
public 

$files = [];
$index = 1;
foreach ($pictures as $picture) {
 $filename = 'image_' . $offer_id . '_' . $index . '.jpg';
 $destination = 'sites/default/files/product-photos/' .

$node = Node::create([
  'type' => 'product',
  'title'  => $offer_name,
  'add_to_cart_price' => $offer_price,
  'field_offer_id' => $offer_id,
  'body' => $offer_desc .

$category_term = \Drupal::entityTypeManager()->getStorage('taxonomy_term')->loadByProperties([
  'vid' => 'category',
  'field_category_id' => $id,
]);
$category_term = \reset($category_term);

/**
* {@inheritdoc}
*/
public function buildForm(array $form, FormStateInterface $form_state) {
  $validators = [
    'file_validate_extensions' => ['xml'],
  ];
  $form['upload'] = [
    '#type'

use Drupal\Core\Messenger\MessengerInterface;
/**
 * The messenger service.
 *
 * @var \Drupal\Core\Messenger\MessengerInterface
 */
protected $messenger;
/**
 * The form constructor.
 *
 * @param \Drupal\Core\Messenger\MessengerInterfa