function File::valueCallback

Overrides FormElementBase::valueCallback

File

core/lib/Drupal/Core/Render/Element/File.php, line 84

Class

File

Provides a form element for uploading a file.

Namespace

Code

public static function valueCallback(&$element, $input, FormStateInterface $form_state) {
  if ($input === FALSE) {
    return NULL;
  }
  $parents = $element['#parents'];
  $element_name = array_shift($parents);
  $uploaded_files = \Drupal::request()->files
    ->get('files', []);
  $uploaded_file = $uploaded_files[$element_name] ?? NULL;
  if ($uploaded_file) {
    // Cast this to an array so that the structure is consistent regardless of
    // whether #value is set or not.
    return (array) $uploaded_file;
  }
  return NULL;
}