// Adds a new sortable "last updated" column to posts and pages backend. function custom_columns($defaults) { $defaults['last_updated'] = __('Last Updated', 'your-textdomain'); return $defaults; } add_filter('manage_posts_columns', 'custom_columns'); add_filter('manage_pages_columns', 'custom_columns'); function custom_columns_content($column_name, $post_id) { if ($column_name == 'last_updated') { $last_updated = get_the_modified_date(); echo $last_updated; } } add_action('manage_posts_custom_column', 'custom_columns_content', 10, 2); add_action('manage_pages_custom_column', 'custom_columns_content', 10, 2); function custom_columns_sortable($columns) { $columns['last_updated'] = 'last_updated'; return $columns; } add_filter('manage_edit-post_sortable_columns', 'custom_columns_sortable'); add_filter('manage_edit-page_sortable_columns', 'custom_columns_sortable'); function custom_columns_orderby($query) { if (!is_admin()) { return; } $orderby = $query->get('orderby'); if ('last_updated' == $orderby) { $query->set('orderby', 'modified'); } } add_action('pre_get_posts', 'custom_columns_orderby');