CssCollectionOptimizer::deleteAll

public CssCollectionOptimizer::deleteAll()

public function deleteAll() {
  $this->state->delete('drupal_css_cache_files');

  $delete_stale = function($uri) {
    // Default stale file threshold is 30 days.
    if (REQUEST_TIME - filemtime($uri) > \Drupal::config('system.performance')->get('stale_file_threshold')) {
      file_unmanaged_delete($uri);
    }
  };
  file_scan_directory('public://css', '/.*/', array('callback' => $delete_stale));
}