增加列表id栏

#   添加一个新的列ID，将ID设置为第一列
function ssid_column($columns)
{
    return array_merge(array('ssid' => 'ID'), $columns);
}
#   显示ID
function ssid_value($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;
}
function ssid_css()
{
    echo "<style>.column-ssid,#ssid{width: 50px;text-align: center; padding: 0px; margin: 0px;}</style>";
}

// 通过动作/过滤器输出各种表格和CSS
function ssid_add()
{
    add_action('admin_head', 'ssid_css');
    //文章
    add_filter('manage_posts_columns', 'ssid_column');
    add_action('manage_posts_custom_column', 'ssid_value', 10, 2);
    // 页面
    add_filter('manage_pages_columns', 'ssid_column');
    add_action('manage_pages_custom_column', 'ssid_value', 10, 2);
    // 媒体
    add_filter('manage_media_columns', 'ssid_column');
    add_action('manage_media_custom_column', 'ssid_value', 10, 2);
    // 连接
    add_filter('manage_link-manager_columns', 'ssid_column');
    add_action('manage_link_custom_column', 'ssid_value', 10, 2);
    // 连接分类
    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);
    }
    // 用户
    add_action('manage_users_columns', 'ssid_column');
    add_filter('manage_users_custom_column', 'ssid_return_value', 10, 3);
    // 评论
    add_action('manage_edit-comments_columns', 'ssid_column');
    add_action('manage_comments_custom_column', 'ssid_value', 10, 2);
}

add_action('admin_init', 'ssid_add');