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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 |
|---|---|
| 422 | * @since 3.0.0 |
| 423 | */ |
| 424 | function wp_nav_menu_post_type_meta_boxes() { |
| 425 | $post_types = get_post_types( array( 'show_in_nav_menus' => true ), 'object' ); |
| 426 | |
| 427 | if ( ! $post_types ) |
| 428 | return; |
| 429 | |
| 430 | foreach ( $post_types as $post_type ) { |
| 431 | $post_type = apply_filters( 'nav_menu_meta_box_object', $post_type ); |
| 432 | if ( $post_type ) { |
| 433 | $id = $post_type->name; |
| 434 | add_meta_box( "add-{$id}", $post_type->labels->name, 'wp_nav_menu_item_post_type_meta_box', 'nav-menus', 'side', 'default', $post_type ); |
| 435 | } |
| 436 | } |
| 437 | } |
| 438 | |
| 439 | /** |
| 440 | * Creates metaboxes for any taxonomy menu item. |
| Line | Code |
| 442 | * @since 3.0.0 |
| 443 | */ |
| 444 | function wp_nav_menu_taxonomy_meta_boxes() { |
| 445 | $taxonomies = get_taxonomies( array( 'show_in_nav_menus' => true ), 'object' ); |
| 446 | |
| 447 | if ( !$taxonomies ) |
| 448 | return; |
| 449 | |
| 450 | foreach ( $taxonomies as $tax ) { |
| 451 | $tax = apply_filters( 'nav_menu_meta_box_object', $tax ); |
| 452 | if ( $tax ) { |
| 453 | $id = $tax->name; |
| 454 | add_meta_box( "add-{$id}", $tax->labels->name, 'wp_nav_menu_item_taxonomy_meta_box', 'nav-menus', 'side', 'default', $tax ); |
| 455 | } |
| 456 | } |
| 457 | } |
| 458 | |
| 459 | /** |
| 460 | * Displays a metabox for the nav menu theme locations. |