To create a dynamic, WordPress-compliant menu system, use this complete functional code to register navigation locations and display menus:

// Add to your theme's functions.php file
function register_dynamic_wordpress_menus() {
    // Register custom menu positions
    register_nav_menus([
        'primary_nav' => __('Primary Header Menu', 'your-theme-text-domain'),
        'footer_nav'  => __('Footer Links Menu', 'your-theme-text-domain')
    ]);
}
add_action('init', 'register_dynamic_wordpress_menus');

// Helper function to display your primary menu
function display_primary_menu() {
    if (has_nav_menu('primary_nav')) {
        wp_nav_menu([
            'theme_location' => 'primary_nav',
            'menu_class'     => 'custom-primary-menu',
            'container'      => 'nav',
            'container_class'=> 'site-header-navigation',
            'depth'          => 2, // Show up to 2 levels of submenus
            'fallback_cb'    => false
        ]);
    }
}

// Helper function to display your footer menu
function display_footer_menu() {
    if (has_nav_menu('footer_nav')) {
        wp_nav_menu([
            'theme_location' => 'footer_nav',
            'menu_class'     => 'custom-footer-menu',
            'container'      => 'div',
            'container_class'=> 'footer-menu-container',
            'depth'          => 1 // No submenus for footer
        ]);
    }
}

To use these menus in your theme:

1. In the template where you want the primary menu (e.g., header.php), add <?php display_primary_menu(); ?>
2. In your footer template, add <?php display_footer_menu(); ?>
3. Navigate to WordPress Dashboard → Appearance → Menus to create/edit menus and assign them to the registered locations.

This follows WordPress best practices for dynamic menu management, allowing full control over menu structure from the admin dashboard.

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