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To save our bandwidth, we show only a snippet of code around each occurence of the hook. View complete file in SVN (without highlighting).
The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
This hook occurs 2 times in this file.
| Line | Code | 
|---|---|
| 330 |       * Note: these actions are also fired in wp_ajax_update_widget(). | 
| 331 |       * | 
| 332 |       * @since 3.9.0 | 
| 333 |       */ | 
| 334 |      public function customize_controls_init() { | 
| 335 |           /** This action is documented in wp-admin/includes/ajax-actions.php */ | 
| 336 |           do_action( 'load-widgets.php' ); // phpcs:ignore WordPress.NamingConventions.ValidHookName.UseUnderscores | 
| 337 |  | 
| 338 |           /** This action is documented in wp-admin/includes/ajax-actions.php */ | 
| 339 |           do_action( 'widgets.php' ); // phpcs:ignore WordPress.NamingConventions.ValidHookName.UseUnderscores | 
| 340 |  | 
| 341 |           /** This action is documented in wp-admin/widgets.php */ | 
| 342 |           do_action( 'sidebar_admin_setup' ); | 
| 343 |      } | 
| 344 |  | 
| 345 |      /** | 
| 346 |       * Ensures widgets are available for all types of previews. | 
| 347 |       * | 
| 348 |       * When in preview, hook to {@see 'customize_register'} for settings after WordPress is loaded | 
| Line | Code | 
| 1693 |  | 
| 1694 |           if ( empty( $_POST['widget-id'] ) ) { | 
| 1695 |                wp_send_json_error( 'missing_widget-id' ); | 
| 1696 |           } | 
| 1697 |  | 
| 1698 |           /** This action is documented in wp-admin/includes/ajax-actions.php */ | 
| 1699 |           do_action( 'load-widgets.php' ); // phpcs:ignore WordPress.NamingConventions.ValidHookName.UseUnderscores | 
| 1700 |  | 
| 1701 |           /** This action is documented in wp-admin/includes/ajax-actions.php */ | 
| 1702 |           do_action( 'widgets.php' ); // phpcs:ignore WordPress.NamingConventions.ValidHookName.UseUnderscores | 
| 1703 |  | 
| 1704 |           /** This action is documented in wp-admin/widgets.php */ | 
| 1705 |           do_action( 'sidebar_admin_setup' ); | 
| 1706 |  | 
| 1707 |           $widget_id = $this->get_post_value( 'widget-id' ); | 
| 1708 |           $parsed_id = $this->parse_widget_id( $widget_id ); | 
| 1709 |           $id_base   = $parsed_id['id_base']; | 
| 1710 |  | 
| 1711 |           $is_updating_widget_template = ( |