WordPress后台直接显示文章、页面、分类、标签和用户等ID号

有时我们需要查看某篇文章或者分类的ID，需要将鼠标放在文章或者分类名称上，然后查看浏览器状态栏上链接中的数字才能获得ID号，不够直观，可以将下面的代码添加到当前主题 functions.php 文件中，之后会在后台文章、分类等列表后面直接显示ID号：

// Prepend the new column to the columns arrayfunction ssid_column($cols) {    $cols['ssid'] = 'ID';    return $cols;}// Echo the ID for the new columnfunction ssid_value($column_name, $id) {    if ($column_name == 'ssid')        echo $id;}function ssid_return_value($value, $column_name, $id) {    if ($column_name == 'ssid')        $value = $id;    return $value;}// Output CSS for width of new columnfunction ssid_css() {?><style type="text/css">    #ssid { width: 50px; } /* Simply Show IDs */</style><?php}// Actions/Filters for various tables and the css outputfunction ssid_add() {    add_action('admin_head', 'ssid_css');    add_filter('manage_posts_columns', 'ssid_column');    add_action('manage_posts_custom_column', 'ssid_value', 10, 2);    add_filter('manage_pages_columns', 'ssid_column');    add_action('manage_pages_custom_column', 'ssid_value', 10, 2);    add_filter('manage_media_columns', 'ssid_column');    add_action('manage_media_custom_column', 'ssid_value', 10, 2);    add_filter('manage_link-manager_columns', 'ssid_column');    add_action('manage_link_custom_column', 'ssid_value', 10, 2);    add_action('manage_edit-link-categories_columns', 'ssid_column');    add_filter('manage_link_categories_custom_column', 'ssid_return_value', 10, 3);    foreach ( get_taxonomies() as $taxonomy ) {        add_action("manage_edit-${taxonomy}_columns", 'ssid_column');        add_filter("manage_${taxonomy}_custom_column", 'ssid_return_value', 10, 3);    }    add_action('manage_users_columns', 'ssid_column');    add_filter('manage_users_custom_column', 'ssid_return_value', 10, 3);    add_action('manage_edit-comments_columns', 'ssid_column');    add_action('manage_comments_custom_column', 'ssid_value', 10, 2);}add_action('admin_init', 'ssid_add');