Title: next_widget_id_number
Published: April 25, 2014
Last modified: May 20, 2026

---

# next_widget_id_number( string $id_base ): int

## In this article

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

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

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

 `$id_base`stringrequired

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

 int Next available widget ID number.

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

    ```php
    function next_widget_id_number( $id_base ) {
    	global $wp_registered_widgets;
    	$number = 1;

    	foreach ( $wp_registered_widgets as $widget_id => $widget ) {
    		if ( preg_match( '/' . preg_quote( $id_base, '/' ) . '-([0-9]+)$/', $widget_id, $matches ) ) {
    			$number = max( $number, $matches[1] );
    		}
    	}
    	++$number;

    	return $number;
    }
    ```

[View all references](https://developer.wordpress.org/reference/files/wp-admin/includes/widgets.php/)
[View on Trac](https://core.trac.wordpress.org/browser/tags/7.0/src/wp-admin/includes/widgets.php#L162)
[View on GitHub](https://github.com/WordPress/wordpress-develop/blob/7.0/src/wp-admin/includes/widgets.php#L162-L174)

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

| Used by | Description | 
| [WP_REST_Widgets_Controller::save_widget()](https://developer.wordpress.org/reference/classes/wp_rest_widgets_controller/save_widget/)`wp-includes/rest-api/endpoints/class-wp-rest-widgets-controller.php` |

Saves the widget in the request object.

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

Display list of the available widgets.

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

Builds up an index of all available widgets for use in Backbone models.

  |

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