如何以编程方式更改Wordpress中的菜单？

I've created one menu in Norwegian menu_no and one in English menu_en.

I can see that my theme supports only one menu, but I'm not planning on using more that one menu at a time. So when user selects English language, how can I change the active menu?

I've not found anything on Google and I can't find the right function in nav-menu.php.

UPDATE
I found quite a simple solution for my problem. I just had to think a bit differently. In my functions.phpI added this code:

add_action('init', 'register_menus');

function register_menus(){
    register_nav_menus( array(
        'menu_no' => 'Norwegian menu',
        'menu_en' => 'English menu',
    ) );
}

and in my header.php file I use this code:

global $lang;

$args = array(
    'theme_location' => 'menu_'.$lang,
    'container'         => false
);


<?php wp_nav_menu($args); ?>

Voila. I'll post it as answer later - if not anyone else comes up with a better idea.

Here is How You Can Do That.

Past this code to function.php file

// Register Navigation Menus
function custom_navigation_menus() {
$locations = array(
    'first_menu' => __( 'Menu for English language', 'text_domain' ),
    'second_menu' => __( 'Menu for Other Language', 'text_domain' ),
);
register_nav_menus( $locations );

}

// Hook into the 'init' action

add_action( 'init', 'custom_navigation_menus' );

You can customize the above code. Now use wp_nav_menu function to display anywhere you want like this

                              <?php
                             wp_nav_menu( array(
                                'menu'              => 'primary',
                                'theme_location'    => 'first_menu',
                            );

                             ?>

                            <?php
                             wp_nav_menu( array(
                                'menu'              => 'secondary',
                                'theme_location'    => 'second_menu',
                            );

                             ?>

You can display each menu in different places. Now you to Option in you menu Primary and Secondary