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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 |
|---|---|
| 1318 | unset( $nav_menu_option['auto_add'][$key] ); |
| 1319 | } |
| 1320 | // Remove nonexistent/deleted menus |
| 1321 | $nav_menu_option['auto_add'] = array_intersect( $nav_menu_option['auto_add'], wp_get_nav_menus( array( 'fields' => 'ids' ) ) ); |
| 1322 | update_option( 'nav_menu_options', $nav_menu_option ); |
| 1323 | |
| 1324 | wp_defer_term_counting( false ); |
| 1325 | |
| 1326 | /** This action is documented in wp-includes/nav-menu.php */ |
| 1327 | do_action( 'wp_update_nav_menu', $nav_menu_selected_id ); |
| 1328 | |
| 1329 | $messages[] = '<div id="message" class="updated"><p>' . sprintf( __( '<strong>%1$s</strong> has been updated.' ), $nav_menu_selected_title ) . '</p></div>'; |
| 1330 | unset( $menu_items, $unsorted_menu_items ); |
| 1331 | |
| 1332 | return $messages; |
| 1333 | } |
| 1334 | |