How Create Dynamic WordPress Menu By php Using Function

wp_menu.php

<?php


include_once('inc/theme_files.php');

    function felxo_theme_menus(){
        register_nav_menus(array(
        'main_menu' => 'Main menu',
        'footer_menu' => 'Footer menu'
        ));
    }
    
add_action('init', 'felxo_theme_menus');


    function felxo_theme_default_menu(){
        echo'<ul class="nav navbar-nav">';
        if ('page'!=get_option('show_on_front')) {
            echo'<li><a href="'.home_url().'/">Home</a></li>';
        }
        wp_list_pages('title_li=');
        echo'</ul>';
    }
?>