WordPress为文章列表添加id列

在 function.php 下添加：

需要注意 add_filter 和 add_action，不要弄混

function krjojo_tool_id_column($columns)
{
  if (count($columns) > 2) {
    $columns = array_merge(array_slice($columns, 0, 1), ['krjojo_tool_id' => 'ID'], array_slice($columns, 1));
  }
  // $columns['id'] = 'ID';
  return $columns;
}
function krjojo_tool_id_value($column_name, $id)
{
  if ($column_name == 'krjojo_tool_id') echo $id;
}
function krjojo_tool_filter_id_value($value, $column_name, $id)
{
  if ($column_name == 'krjojo_tool_id') $value = $id;
  return $value;
}
// 文章
add_filter('manage_posts_columns', 'krjojo_tool_id_column');
add_action('manage_posts_custom_column', 'krjojo_tool_id_value', 10, 2);
// 页面
add_filter('manage_pages_columns', 'krjojo_tool_id_column');
add_action('manage_pages_custom_column', 'krjojo_tool_id_value', 10, 2);
// 媒体
add_filter('manage_media_columns', 'krjojo_tool_id_column');
add_action('manage_media_custom_column', 'krjojo_tool_id_value', 10, 2);
// 链接
add_filter('manage_link-manager_columns', 'krjojo_tool_id_column');
add_action('manage_link_custom_column', 'krjojo_tool_id_value', 10, 2);
// 分类
foreach (get_taxonomies() as $taxonomy) {
  add_action("manage_edit-" . $taxonomy . "_columns", 'krjojo_tool_id_column');
  add_filter("manage_" . $taxonomy . "_custom_column", 'krjojo_tool_filter_id_value', 10, 3);
}
// 用户
add_action('manage_users_columns','krjojo_tool_id_column');
add_filter('manage_users_custom_column','krjojo_tool_filter_id_value',10,3);
// 评论
add_action('manage_edit-comments_columns','krjojo_tool_id_column');
add_action('manage_comments_custom_column','krjojo_tool_id_value',10,2);
// 样式 ID列宽度
add_action('admin_head', function () {
  echo '<style type="text/css">#krjojo_tool_id { width: 50px; }</style>';
});