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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 |
|---|---|
| 221 | * |
| 222 | * If a falsey value is returned instead of an object, the menu items |
| 223 | * meta box for the current meta box object will not be added. |
| 224 | * |
| 225 | * @since 3.0.0 |
| 226 | * |
| 227 | * @param WP_Post_Type|false $post_type The current object to add a menu items |
| 228 | * meta box for. |
| 229 | */ |
| 230 | $post_type = apply_filters( 'nav_menu_meta_box_object', $post_type ); |
| 231 | if ( $post_type ) { |
| 232 | $id = $post_type->name; |
| 233 | // Give pages a higher priority. |
| 234 | $priority = ( 'page' === $post_type->name ? 'core' : 'default' ); |
| 235 | add_meta_box( "add-post-type-{$id}", $post_type->labels->name, 'wp_nav_menu_item_post_type_meta_box', 'nav-menus', 'side', $priority, $post_type ); |
| 236 | } |
| 237 | } |
| 238 | } |
| 239 | |
| Line | Code |
| 245 | function wp_nav_menu_taxonomy_meta_boxes() { |
| 246 | $taxonomies = get_taxonomies( array( 'show_in_nav_menus' => true ), 'object' ); |
| 247 | |
| 248 | if ( ! $taxonomies ) { |
| 249 | return; |
| 250 | } |
| 251 | |
| 252 | foreach ( $taxonomies as $tax ) { |
| 253 | /** This filter is documented in wp-admin/includes/nav-menu.php */ |
| 254 | $tax = apply_filters( 'nav_menu_meta_box_object', $tax ); |
| 255 | if ( $tax ) { |
| 256 | $id = $tax->name; |
| 257 | add_meta_box( "add-{$id}", $tax->labels->name, 'wp_nav_menu_item_taxonomy_meta_box', 'nav-menus', 'side', 'default', $tax ); |
| 258 | } |
| 259 | } |
| 260 | } |
| 261 | |
| 262 | /** |
| 263 | * Check whether to disable the Menu Locations meta box submit button and inputs. |