Title: is_registered_sidebar
Published: December 9, 2015
Last modified: April 28, 2025

---

# is_registered_sidebar( string|int $sidebar_id ): bool

## In this article

 * [Parameters](https://developer.wordpress.org/reference/functions/is_registered_sidebar/?output_format=md#parameters)
 * [Return](https://developer.wordpress.org/reference/functions/is_registered_sidebar/?output_format=md#return)
 * [Source](https://developer.wordpress.org/reference/functions/is_registered_sidebar/?output_format=md#source)
 * [Related](https://developer.wordpress.org/reference/functions/is_registered_sidebar/?output_format=md#related)
 * [Changelog](https://developer.wordpress.org/reference/functions/is_registered_sidebar/?output_format=md#changelog)

[ Back to top](https://developer.wordpress.org/reference/functions/is_registered_sidebar/?output_format=md#wp--skip-link--target)

Checks if a sidebar is registered.

## 󠀁[Parameters](https://developer.wordpress.org/reference/functions/is_registered_sidebar/?output_format=md#parameters)󠁿

 `$sidebar_id`string|intrequired

The ID of the sidebar when it was registered.

## 󠀁[Return](https://developer.wordpress.org/reference/functions/is_registered_sidebar/?output_format=md#return)󠁿

 bool True if the sidebar is registered, false otherwise.

## 󠀁[Source](https://developer.wordpress.org/reference/functions/is_registered_sidebar/?output_format=md#source)󠁿

    ```php
    function is_registered_sidebar( $sidebar_id ) {
    	global $wp_registered_sidebars;

    	return isset( $wp_registered_sidebars[ $sidebar_id ] );
    }
    ```

[View all references](https://developer.wordpress.org/reference/files/wp-includes/widgets.php/)
[View on Trac](https://core.trac.wordpress.org/browser/tags/6.9.4/src/wp-includes/widgets.php#L357)
[View on GitHub](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/widgets.php#L357-L361)

## 󠀁[Related](https://developer.wordpress.org/reference/functions/is_registered_sidebar/?output_format=md#related)󠁿

| Used by | Description | 
| [WP_Customize_Widgets::render_widget_partial()](https://developer.wordpress.org/reference/classes/wp_customize_widgets/render_widget_partial/)`wp-includes/class-wp-customize-widgets.php` |

Renders a specific widget using the supplied sidebar arguments.

  | 
| [WP_Customize_Widgets::filter_dynamic_sidebar_params()](https://developer.wordpress.org/reference/classes/wp_customize_widgets/filter_dynamic_sidebar_params/)`wp-includes/class-wp-customize-widgets.php` |

Inject selective refresh data attributes into widget container elements.

  | 
| [register_sidebars()](https://developer.wordpress.org/reference/functions/register_sidebars/)`wp-includes/widgets.php` |

Creates multiple sidebars.

  | 
| [WP_Customize_Widgets::tally_sidebars_via_is_active_sidebar_calls()](https://developer.wordpress.org/reference/classes/wp_customize_widgets/tally_sidebars_via_is_active_sidebar_calls/)`wp-includes/class-wp-customize-widgets.php` |

Tallies the sidebars rendered via [is_active_sidebar()](https://developer.wordpress.org/reference/functions/is_active_sidebar/) .

  | 
| [WP_Customize_Widgets::tally_sidebars_via_dynamic_sidebar_calls()](https://developer.wordpress.org/reference/classes/wp_customize_widgets/tally_sidebars_via_dynamic_sidebar_calls/)`wp-includes/class-wp-customize-widgets.php` |

Tallies the sidebars rendered via [dynamic_sidebar()](https://developer.wordpress.org/reference/functions/dynamic_sidebar/) .

  | 
| [WP_Customize_Widgets::customize_register()](https://developer.wordpress.org/reference/classes/wp_customize_widgets/customize_register/)`wp-includes/class-wp-customize-widgets.php` |

Registers Customizer settings and controls for all sidebars and widgets.

  |

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## 󠀁[Changelog](https://developer.wordpress.org/reference/functions/is_registered_sidebar/?output_format=md#changelog)󠁿

| Version | Description | 
| [4.4.0](https://developer.wordpress.org/reference/since/4.4.0/) | Introduced. |

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