#29: wp_edit_nav_menu_walker

wp_edit_nav_menu_walker.php

<?php
/**
 * Use custom Walker class when adding menu items.
 *
 * @see wp_ajax_add_menu_item()
 *
 * @param string $class The Walker class name to use. Default is 'Walker_Nav_Menu_Edit'.
 * @param int $menu_id The menu id. Uses the value of $_POST['menu'].
 *
 * @return string The Walker class name.
 */
function wpdocs_add_items_custom_walker( $class, $menu_id ) {
	return 'My_Custom_Edit_Walker';
}
add_filter( 'wp_edit_nav_menu_walker', 'wpdocs_add_items_custom_walker', 10, 2 );