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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 |
|---|---|
| 617 | } |
| 618 | |
| 619 | $sidebars_widgets = wp_get_sidebars_widgets(); |
| 620 | if ( empty( $wp_registered_sidebars[ $index ] ) || empty( $sidebars_widgets[ $index ] ) || ! is_array( $sidebars_widgets[ $index ] ) ) { |
| 621 | /** This action is documented in wp-includes/widget.php */ |
| 622 | do_action( 'dynamic_sidebar_before', $index, false ); |
| 623 | /** This action is documented in wp-includes/widget.php */ |
| 624 | do_action( 'dynamic_sidebar_after', $index, false ); |
| 625 | /** This filter is documented in wp-includes/widget.php */ |
| 626 | return apply_filters( 'dynamic_sidebar_has_widgets', false, $index ); |
| 627 | } |
| 628 | |
| 629 | /** |
| 630 | * Fires before widgets are rendered in a dynamic sidebar. |
| 631 | * |
| 632 | * Note: The action also fires for empty sidebars, and on both the front-end |
| 633 | * and back-end, including the Inactive Widgets sidebar on the Widgets screen. |
| 634 | * |
| 635 | * @since 3.9.0 |
| Line | Code |
| 751 | * Note: The filter is also evaluated for empty sidebars, and on both the front-end |
| 752 | * and back-end, including the Inactive Widgets sidebar on the Widgets screen. |
| 753 | * |
| 754 | * @since 3.9.0 |
| 755 | * |
| 756 | * @param bool $did_one Whether at least one widget was rendered in the sidebar. |
| 757 | * Default false. |
| 758 | * @param int|string $index Index, name, or ID of the dynamic sidebar. |
| 759 | */ |
| 760 | return apply_filters( 'dynamic_sidebar_has_widgets', $did_one, $index ); |
| 761 | } |
| 762 | |
| 763 | /** |
| 764 | * Whether widget is displayed on the front-end. |
| 765 | * |
| 766 | * Either $callback or $id_base can be used |
| 767 | * $id_base is the first argument when extending WP_Widget class |
| 768 | * Without the optional $widget_id parameter, returns the ID of the first sidebar |
| 769 | * in which the first instance of the widget with the given callback or $id_base is found. |