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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 |
|---|---|
| 191 | * |
| 192 | * If a falsey value is returned instead of an object, the menu items |
| 193 | * meta box for the current meta box object will not be added. |
| 194 | * |
| 195 | * @since 3.0.0 |
| 196 | * |
| 197 | * @param object $meta_box_object The current object to add a menu items |
| 198 | * meta box for. |
| 199 | */ |
| 200 | $post_type = apply_filters( 'nav_menu_meta_box_object', $post_type ); |
| 201 | if ( $post_type ) { |
| 202 | $id = $post_type->name; |
| 203 | // Give pages a higher priority. |
| 204 | $priority = ( 'page' == $post_type->name ? 'core' : 'default' ); |
| 205 | add_meta_box( "add-post-type-{$id}", $post_type->labels->name, 'wp_nav_menu_item_post_type_meta_box', 'nav-menus', 'side', $priority, $post_type ); |
| 206 | } |
| 207 | } |
| 208 | } |
| 209 | |
| Line | Code |
| 214 | */ |
| 215 | function wp_nav_menu_taxonomy_meta_boxes() { |
| 216 | $taxonomies = get_taxonomies( array( 'show_in_nav_menus' => true ), 'object' ); |
| 217 | |
| 218 | if ( !$taxonomies ) |
| 219 | return; |
| 220 | |
| 221 | foreach ( $taxonomies as $tax ) { |
| 222 | /** This filter is documented in wp-admin/includes/nav-menu.php */ |
| 223 | $tax = apply_filters( 'nav_menu_meta_box_object', $tax ); |
| 224 | if ( $tax ) { |
| 225 | $id = $tax->name; |
| 226 | add_meta_box( "add-{$id}", $tax->labels->name, 'wp_nav_menu_item_taxonomy_meta_box', 'nav-menus', 'side', 'default', $tax ); |
| 227 | } |
| 228 | } |
| 229 | } |
| 230 | |
| 231 | /** |
| 232 | * Check whether to disable the Menu Locations meta box submit button |