Using WordPress ‘dynamic_sidebar_has_widgets’ PHP filter

The dynamic_sidebar_has_widgets WordPress PHP filter allows you to modify whether a sidebar has widgets or not.

Usage

add_filter('dynamic_sidebar_has_widgets', 'your_custom_function', 10, 2);

function your_custom_function($did_one, $index) {
    // your custom code here
    return $did_one;
}

Parameters

$did_one (bool) – Whether at least one widget was rendered in the sidebar. Default is false.
$index (int|string) – Index, name, or ID of the dynamic sidebar.

More information

See WordPress Developer Resources: dynamic_sidebar_has_widgets

Examples

If you want to always display a specific widget in all sidebars, you can use this filter.

add_filter('dynamic_sidebar_has_widgets', 'always_show_widget', 10, 2);

function always_show_widget($did_one, $index) {
    if (!$did_one) {
        // Display your specific widget
        the_widget('WP_Widget_YourWidget');
    }
    return true;
}

Hide widgets on a specific page

To hide widgets on a specific page, you can use this filter.

add_filter('dynamic_sidebar_has_widgets', 'hide_widgets_on_specific_page', 10, 2);

function hide_widgets_on_specific_page($did_one, $index) {
    if (is_page('your-specific-page-slug')) {
        return false;
    }
    return $did_one;
}

Show widgets only for logged-in users

You can use this filter to show widgets only for logged-in users.

add_filter('dynamic_sidebar_has_widgets', 'show_widgets_for_logged_in_users', 10, 2);

function show_widgets_for_logged_in_users($did_one, $index) {
    if (!is_user_logged_in()) {
        return false;
    }
    return $did_one;
}

Hide widgets on certain post types

To hide widgets on certain post types, you can use this filter.

add_filter('dynamic_sidebar_has_widgets', 'hide_widgets_on_post_types', 10, 2);

function hide_widgets_on_post_types($did_one, $index) {
    if (is_singular('your-post-type')) {
        return false;
    }
    return $did_one;
}

Show widgets only on specific categories

You can use this filter to show widgets only on specific categories.

add_filter('dynamic_sidebar_has_widgets', 'show_widgets_on_specific_categories', 10, 2);

function show_widgets_on_specific_categories($did_one, $index) {
    if (!is_category(array('category-1', 'category-2'))) {
        return false;
    }
    return $did_one;
}