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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 |
---|---|
924 |
|
925 | if ( ! isset( $menu_item->description ) ) { |
926 | /** |
927 | * Filters a navigation menu item's description. |
928 | * |
929 | * @since 3.0.0 |
930 | * |
931 | * @param string $description The menu item description. |
932 | */ |
933 | $menu_item->description = apply_filters( 'nav_menu_description', wp_trim_words( $menu_item->post_content, 200 ) ); |
934 | } |
935 |
|
936 | $menu_item->classes = ! isset( $menu_item->classes ) ? (array) get_post_meta( $menu_item->ID, '_menu_item_classes', true ) : $menu_item->classes; |
937 | $menu_item->xfn = ! isset( $menu_item->xfn ) ? get_post_meta( $menu_item->ID, '_menu_item_xfn', true ) : $menu_item->xfn; |
938 | } else { |
939 | $menu_item->db_id = 0; |
940 | $menu_item->menu_item_parent = 0; |
941 | $menu_item->object_id = (int) $menu_item->ID; |
942 | $menu_item->type = 'post_type'; |
Line | Code |
952 |
|
953 | $menu_item->title = $menu_item->post_title; |
954 | $menu_item->url = get_permalink( $menu_item->ID ); |
955 | $menu_item->target = ''; |
956 |
|
957 | /** This filter is documented in wp-includes/nav-menu.php */ |
958 | $menu_item->attr_title = apply_filters( 'nav_menu_attr_title', '' ); |
959 |
|
960 | /** This filter is documented in wp-includes/nav-menu.php */ |
961 | $menu_item->description = apply_filters( 'nav_menu_description', '' ); |
962 | $menu_item->classes = array(); |
963 | $menu_item->xfn = ''; |
964 | } |
965 | } elseif ( isset( $menu_item->taxonomy ) ) { |
966 | $menu_item->ID = $menu_item->term_id; |
967 | $menu_item->db_id = 0; |
968 | $menu_item->menu_item_parent = 0; |
969 | $menu_item->object_id = (int) $menu_item->term_id; |
970 | $menu_item->post_parent = (int) $menu_item->parent; |