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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 |
|---|---|
| 702 | } |
| 703 | |
| 704 | $sidebars_widgets = wp_get_sidebars_widgets(); |
| 705 | if ( empty( $wp_registered_sidebars[ $index ] ) || empty( $sidebars_widgets[ $index ] ) || ! is_array( $sidebars_widgets[ $index ] ) ) { |
| 706 | /** This action is documented in wp-includes/widget.php */ |
| 707 | do_action( 'dynamic_sidebar_before', $index, false ); |
| 708 | /** This action is documented in wp-includes/widget.php */ |
| 709 | do_action( 'dynamic_sidebar_after', $index, false ); |
| 710 | /** This filter is documented in wp-includes/widget.php */ |
| 711 | return apply_filters( 'dynamic_sidebar_has_widgets', false, $index ); |
| 712 | } |
| 713 | |
| 714 | $sidebar = $wp_registered_sidebars[ $index ]; |
| 715 | |
| 716 | $sidebar['before_sidebar'] = sprintf( $sidebar['before_sidebar'], $sidebar['id'], $sidebar['class'] ); |
| 717 | |
| 718 | /** |
| 719 | * Fires before widgets are rendered in a dynamic sidebar. |
| 720 | * |
| Line | Code |
| 863 | * Note: The filter is also evaluated for empty sidebars, and on both the front end |
| 864 | * and back end, including the Inactive Widgets sidebar on the Widgets screen. |
| 865 | * |
| 866 | * @since 3.9.0 |
| 867 | * |
| 868 | * @param bool $did_one Whether at least one widget was rendered in the sidebar. |
| 869 | * Default false. |
| 870 | * @param int|string $index Index, name, or ID of the dynamic sidebar. |
| 871 | */ |
| 872 | return apply_filters( 'dynamic_sidebar_has_widgets', $did_one, $index ); |
| 873 | } |
| 874 | |
| 875 | /** |
| 876 | * Determines whether a given widget is displayed on the front end. |
| 877 | * |
| 878 | * Either $callback or $id_base can be used |
| 879 | * $id_base is the first argument when extending WP_Widget class |
| 880 | * Without the optional $widget_id parameter, returns the ID of the first sidebar |
| 881 | * in which the first instance of the widget with the given callback or $id_base is found. |