How to Add wp MDBootstrap nav walker

Installation

Step:- 1

class-wp-bootstrap-navwalker.php download to Click here

Step:- 2

Place class-wp-bootstrap-navwalker.php in your WordPress theme folder /wp-content/themes/your-theme/
Open your WordPress themes functions.php file - /wp-content/themes/your-theme/functions.php - and add the following code:

/**
 * Register Custom Navigation Walker
 */
function register_navwalker(){
	require_once get_template_directory() . '/class-wp-bootstrap-navwalker.php';
}
add_action( 'after_setup_theme', 'register_navwalker' );

Step:- 3

You will also need to declare a new menu in your functions.php file if one doesn't already exist.

register_nav_menus( array(
    'primary' => __( 'Primary Menu', 'THEMENAME' ),
) );

Step:- 4

Add or update any wp_nav_menu() functions in your theme (often found in header.php) to use the new walker by adding a 'walker' item to the wp_nav_menu args array.

wp_nav_menu( array(
    'theme_location'  => 'primary',
    'depth'           => 2, // 1 = no dropdowns, 2 = with dropdowns.
    'container'       => 'div',
    'container_class' => 'collapse navbar-collapse',
    'container_id'    => 'navbarRightAlignExample',
    'menu_class'      => 'navbar-nav ms-auto mb-2 mb-lg-0',
    'fallback_cb'     => 'WP_Bootstrap_Navwalker::fallback',
    'walker'          => new WP_Bootstrap_Navwalker(),
) );

<nav class="navbar navbar-expand-lg navbar-light bg-light">
  <!-- Container wrapper -->
  <div class="container-fluid">
  <a class="navbar-brand" href="#">Navbar</a>
    <!-- Toggle button -->
    <button
      class="navbar-toggler"
      type="button"
      data-mdb-toggle="collapse"
      data-mdb-target="#navbarRightAlignExample"
      aria-controls="navbarRightAlignExample"
      aria-expanded="false"
      aria-label="<?php esc_attr_e( 'Toggle navigation', 'your-theme-slug' ); ?>"
    >
      <i class="fas fa-bars"></i>
    </button>

    <?php
        wp_nav_menu( array(
            'theme_location'    => 'primary',
            'depth'             => 2,
            'container'         => 'div',
            'container_class'   => 'collapse navbar-collapse',
            'container_id'      => 'navbarRightAlignExample',
            'menu_class'        => 'navbar-nav ms-auto mb-2 mb-lg-0',
            'fallback_cb'       => 'WP_Bootstrap_Navwalker::fallback',
            'walker'            => new WP_Bootstrap_Navwalker(),
        ) );
        ?>
        
  </div>
  <!-- Container wrapper -->
</nav>

Installation is finished. If you get any problems and error. Please comments below