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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.
| Line | Code |
|---|---|
| 370 | if ( false !== ( $key = array_search( $nav_menu_selected_id, $nav_menu_option['auto_add'] ) ) ) |
| 371 | unset( $nav_menu_option['auto_add'][$key] ); |
| 372 | } |
| 373 | // Remove nonexistent/deleted menus |
| 374 | $nav_menu_option['auto_add'] = array_intersect( $nav_menu_option['auto_add'], wp_get_nav_menus( array( 'fields' => 'ids' ) ) ); |
| 375 | update_option( 'nav_menu_options', $nav_menu_option ); |
| 376 | |
| 377 | wp_defer_term_counting(false); |
| 378 | |
| 379 | do_action( 'wp_update_nav_menu', $nav_menu_selected_id ); |
| 380 | |
| 381 | $messages[] = '<div id="message" class="updated"><p>' . sprintf( __('The <strong>%s</strong> menu has been updated.'), $nav_menu_selected_title ) . '</p></div>'; |
| 382 | unset( $menu_items, $unsorted_menu_items ); |
| 383 | } |
| 384 | } |
| 385 | break; |
| 386 | } |
| 387 | |
| 388 | // Get all nav menus |