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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 |
|---|---|
| 647 | } |
| 648 | |
| 649 | $sidebars_widgets = wp_get_sidebars_widgets(); |
| 650 | if ( empty( $wp_registered_sidebars[ $index ] ) || empty( $sidebars_widgets[ $index ] ) || ! is_array( $sidebars_widgets[ $index ] ) ) { |
| 651 | /** This action is documented in wp-includes/widget.php */ |
| 652 | do_action( 'dynamic_sidebar_before', $index, false ); |
| 653 | /** This action is documented in wp-includes/widget.php */ |
| 654 | do_action( 'dynamic_sidebar_after', $index, false ); |
| 655 | /** This filter is documented in wp-includes/widget.php */ |
| 656 | return apply_filters( 'dynamic_sidebar_has_widgets', false, $index ); |
| 657 | } |
| 658 | |
| 659 | /** |
| 660 | * Fires before widgets are rendered in a dynamic sidebar. |
| 661 | * |
| 662 | * Note: The action also fires for empty sidebars, and on both the front end |
| 663 | * and back end, including the Inactive Widgets sidebar on the Widgets screen. |
| 664 | * |
| 665 | * @since 3.9.0 |
| Line | Code |
| 792 | * Note: The filter is also evaluated for empty sidebars, and on both the front end |
| 793 | * and back end, including the Inactive Widgets sidebar on the Widgets screen. |
| 794 | * |
| 795 | * @since 3.9.0 |
| 796 | * |
| 797 | * @param bool $did_one Whether at least one widget was rendered in the sidebar. |
| 798 | * Default false. |
| 799 | * @param int|string $index Index, name, or ID of the dynamic sidebar. |
| 800 | */ |
| 801 | return apply_filters( 'dynamic_sidebar_has_widgets', $did_one, $index ); |
| 802 | } |
| 803 | |
| 804 | /** |
| 805 | * Determines whether a given widget is displayed on the front end. |
| 806 | * |
| 807 | * Either $callback or $id_base can be used |
| 808 | * $id_base is the first argument when extending WP_Widget class |
| 809 | * Without the optional $widget_id parameter, returns the ID of the first sidebar |
| 810 | * in which the first instance of the widget with the given callback or $id_base is found. |