Walker\\u Nav\\u Menu是处理导航菜单的核心类。您可以使用它来处理导航菜单，也可以创建自己的子类来扩展该类。

如果决定使用自己的类，那么在使用wp\\u nav\\u menu（）时必须将实例作为参数传递

class myWalkerClass Extends \\Walker_Nav_Menu {
 //overwrite any method as you see fit.
}

$args = [
  \'container\' => \'div\',
  //...other arguments,
  \'walker\' => new myWalkerClass(),
];

wp_nav_menu( $args );

编辑：子PHP类的示例：

class myWalkerChildClass Extends \\Walker_Nav_Menu {

  /*there are 4 methods that can be overwritten ( meaning that if you declare them here, you are using your own method, and if you dont declare them here, you are using the original method from Walker_Nav_Menu parent PHP class.*/


    /*please note that fore very method, $output is passed by reference, meaning you can modify $output directly in the method, and changes carry over to the next method until it is printed.*/

    function start_lvl(&$output, $depth, $args ) {

        $output .= "\\n<ul>\\n"; //here you are starting a new list,
    }

    function end_lvl(&$output, $depth, $args ) {
        $output .= "</ul>\\n"; //here you are closing a list,
    }


    function start_el(&$output, $item, $depth, $args ) {
        $output. = "<li>".esc_attr($item->label); //here you are starting a new item within a list.
    }

    function end_el(&$output, $item, $depth, $args ) {
        $output .= "</li>\\n"; //and finally closing the item
    }
}

}