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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 |
|---|---|
| 929 | |
| 930 | if ( ! isset( $menu_item->description ) ) { |
| 931 | /** |
| 932 | * Filters a navigation menu item's description. |
| 933 | * |
| 934 | * @since 3.0.0 |
| 935 | * |
| 936 | * @param string $description The menu item description. |
| 937 | */ |
| 938 | $menu_item->description = apply_filters( 'nav_menu_description', wp_trim_words( $menu_item->post_content, 200 ) ); |
| 939 | } |
| 940 | |
| 941 | $menu_item->classes = ! isset( $menu_item->classes ) ? (array) get_post_meta( $menu_item->ID, '_menu_item_classes', true ) : $menu_item->classes; |
| 942 | $menu_item->xfn = ! isset( $menu_item->xfn ) ? get_post_meta( $menu_item->ID, '_menu_item_xfn', true ) : $menu_item->xfn; |
| 943 | } else { |
| 944 | $menu_item->db_id = 0; |
| 945 | $menu_item->menu_item_parent = 0; |
| 946 | $menu_item->object_id = (int) $menu_item->ID; |
| 947 | $menu_item->type = 'post_type'; |
| Line | Code |
| 957 | |
| 958 | $menu_item->title = $menu_item->post_title; |
| 959 | $menu_item->url = get_permalink( $menu_item->ID ); |
| 960 | $menu_item->target = ''; |
| 961 | |
| 962 | /** This filter is documented in wp-includes/nav-menu.php */ |
| 963 | $menu_item->attr_title = apply_filters( 'nav_menu_attr_title', '' ); |
| 964 | |
| 965 | /** This filter is documented in wp-includes/nav-menu.php */ |
| 966 | $menu_item->description = apply_filters( 'nav_menu_description', '' ); |
| 967 | $menu_item->classes = array(); |
| 968 | $menu_item->xfn = ''; |
| 969 | } |
| 970 | } elseif ( isset( $menu_item->taxonomy ) ) { |
| 971 | $menu_item->ID = $menu_item->term_id; |
| 972 | $menu_item->db_id = 0; |
| 973 | $menu_item->menu_item_parent = 0; |
| 974 | $menu_item->object_id = (int) $menu_item->term_id; |
| 975 | $menu_item->post_parent = (int) $menu_item->parent; |