ImageStyle::flush

public ImageStyle::flush($path = NULL)

public function flush($path = NULL) {
  // A specific image path has been provided. Flush only that derivative.
  if (isset($path)) {
    $derivative_uri = $this->buildUri($path);
    if (file_exists($derivative_uri)) {
      file_unmanaged_delete($derivative_uri);
    }
    return $this;
  }

  // Delete the style directory in each registered wrapper.
  $wrappers = $this->getStreamWrapperManager()->getWrappers(StreamWrapperInterface::WRITE_VISIBLE);
  foreach ($wrappers as $wrapper => $wrapper_data) {
    if (file_exists($directory = $wrapper . '://styles/' . $this->id())) {
      file_unmanaged_delete_recursive($directory);
    }
  }

  // Let other modules update as necessary on flush.
  $module_handler = \Drupal::moduleHandler();
  $module_handler->invokeAll('image_style_flush', array($this));

  // Clear caches so that formatters may be added for this style.
  drupal_theme_rebuild();

  Cache::invalidateTags($this->getCacheTagsToInvalidate());

  return $this;
}