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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 |
|---|---|
| 706 | |
| 707 | if ( empty( $menu_item->description ) ) { |
| 708 | /** |
| 709 | * Filter a navigation menu item's description. |
| 710 | * |
| 711 | * @since 3.0.0 |
| 712 | * |
| 713 | * @param string $description The menu item description. |
| 714 | */ |
| 715 | $menu_item->description = apply_filters( 'nav_menu_description', wp_trim_words( $menu_item->post_content, 200 ) ); |
| 716 | } |
| 717 | |
| 718 | $menu_item->classes = empty( $menu_item->classes ) ? (array) get_post_meta( $menu_item->ID, '_menu_item_classes', true ) : $menu_item->classes; |
| 719 | $menu_item->xfn = empty( $menu_item->xfn ) ? get_post_meta( $menu_item->ID, '_menu_item_xfn', true ) : $menu_item->xfn; |
| 720 | } else { |
| 721 | $menu_item->db_id = 0; |
| 722 | $menu_item->menu_item_parent = 0; |
| 723 | $menu_item->object_id = (int) $menu_item->ID; |
| 724 | $menu_item->type = 'post_type'; |
| Line | Code |
| 732 | |
| 733 | $menu_item->title = $menu_item->post_title; |
| 734 | $menu_item->url = get_permalink( $menu_item->ID ); |
| 735 | $menu_item->target = ''; |
| 736 | |
| 737 | /** This filter is documented in wp-includes/nav-menu.php */ |
| 738 | $menu_item->attr_title = apply_filters( 'nav_menu_attr_title', '' ); |
| 739 | |
| 740 | /** This filter is documented in wp-includes/nav-menu.php */ |
| 741 | $menu_item->description = apply_filters( 'nav_menu_description', '' ); |
| 742 | $menu_item->classes = array(); |
| 743 | $menu_item->xfn = ''; |
| 744 | } |
| 745 | } elseif ( isset( $menu_item->taxonomy ) ) { |
| 746 | $menu_item->ID = $menu_item->term_id; |
| 747 | $menu_item->db_id = 0; |
| 748 | $menu_item->menu_item_parent = 0; |
| 749 | $menu_item->object_id = (int) $menu_item->term_id; |
| 750 | $menu_item->post_parent = (int) $menu_item->parent; |