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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 |
|---|---|
| 678 | $index = $key; |
| 679 | break; |
| 680 | } |
| 681 | } |
| 682 | } |
| 683 | |
| 684 | $sidebars_widgets = wp_get_sidebars_widgets(); |
| 685 | if ( empty( $wp_registered_sidebars[ $index ] ) || empty( $sidebars_widgets[ $index ] ) || ! is_array( $sidebars_widgets[ $index ] ) ) { |
| 686 | /** This action is documented in wp-includes/widget.php */ |
| 687 | do_action( 'dynamic_sidebar_before', $index, false ); |
| 688 | /** This action is documented in wp-includes/widget.php */ |
| 689 | do_action( 'dynamic_sidebar_after', $index, false ); |
| 690 | /** This filter is documented in wp-includes/widget.php */ |
| 691 | return apply_filters( 'dynamic_sidebar_has_widgets', false, $index ); |
| 692 | } |
| 693 | |
| 694 | /** |
| 695 | * Fires before widgets are rendered in a dynamic sidebar. |
| 696 | * |
| 697 | * Note: The action also fires for empty sidebars, and on both the front end |
| 698 | * and back end, including the Inactive Widgets sidebar on the Widgets screen. |
| 699 | * |
| 700 | * @since 3.9.0 |
| 701 | * |
| 702 | * @param int|string $index Index, name, or ID of the dynamic sidebar. |
| 703 | * @param bool $has_widgets Whether the sidebar is populated with widgets. |
| 704 | * Default true. |
| 705 | */ |
| 706 | do_action( 'dynamic_sidebar_before', $index, true ); |
| 707 | $sidebar = $wp_registered_sidebars[ $index ]; |
| 708 | |
| 709 | $did_one = false; |
| 710 | foreach ( (array) $sidebars_widgets[ $index ] as $id ) { |
| 711 | |
| 712 | if ( ! isset( $wp_registered_widgets[ $id ] ) ) { |
| 713 | continue; |
| 714 | } |
| 715 | |