function all_view() /*注意这个函数名，调用的就是用它了*/
{
  global $wpdb;
  $count = 0;
  $views = $wpdb->get_results("SELECT * FROM $wpdb->postmeta WHERE meta_key='views'");
  foreach ($views as $key => $value) {
    $meta_value = $value->meta_value;if ($meta_value != ' ') {
      $count += (int) $meta_value;}
  }
  return $count;
}