在创建自定义帖子类型时，我试图定义功能，但它不起作用。这个代码怎么了？

$args = array(
  \'labels\' => $labels,
  \'public\' => true,
  \'publicly_queryable\' => true,
  \'show_ui\' => true,
  \'query_var\' => true,
  \'rewrite\' => true,
  \'hierarchical\' => false,
  \'menu_position\' => null,
  \'supports\' => array(\'title\'),
  \'capabilities\' => array(
   \'edit_post\' => \'edit_video\',
   \'edit_posts\' => \'edit_videos\',
   \'edit_others_posts\' => \'edit_others_videos\',
   \'publish_posts\' => \'publish_videos\',
   \'read_post\' => \'read_videos\',
   \'read_private_posts\' => \'read_private_videos\',
   \'delete_post\' => \'delete_videos\'
   )
   );