function drupal_set_breadcrumb($breadcrumb = NULL) {
  $stored_breadcrumb = &drupal_static(__FUNCTION__);
  dpm(__FUNCTION__);
  if (isset($breadcrumb)) {
    $stored_breadcrumb = $breadcrumb;
  }
  return $stored_breadcrumb;
}

function ben_xyz_init(){
  dpm(drupal_get_breadcrumb());
}

这时会打印dpm(__FUNCTION__)是drupal_set_breadcrumb

变量的值是多少