footer.php

<?php
/**
 *******************************************************************************
 * //footer.php
 *******************************************************************************
 *
 * The general footer.
 *
 * CODEX REF
 * https://codex.wordpress.org/Theme_Development#Footer_.28footer.php
 *
 * @author
 * @copyright
 * @link
 * @todo
 * @license
 * @since
 * @version
**/
?>

<section class="widgets">
    <div class="container">
        <div class="row">
            <div class="col-12 col-sm-4">
                <?php if ( !dynamic_sidebar( 'footer_left' ) ): ?>
                <h4 class="text-center">Sidebar (Page)</h4>
                <p>Oh! No Sidebar?</p>
                <?php endif; ?>
            </div>

            <div class="col-12 col-sm-4">
                <?php if ( !dynamic_sidebar( 'footer_center' ) ): ?>
                <h4 class="text-center">Sidebar (Page)</h4>
                <p>Oh! No Sidebar?</p>
                <?php endif; ?>
            </div>

            <div class="col-12 col-sm-4">
                <?php if ( !dynamic_sidebar( 'footer_right' ) ): ?>
                <h4 class="text-center">Sidebar (Page)</h4>
                <p>Oh! No Sidebar?</p>
                <?php endif; ?>
            </div>
        </div>
    </div>
</section>

<?php
    $nav_check = wp_nav_menu( array('echo' => FALSE, 'fallback_cb' => '') );
    if (!empty($nav_check)) {
?>
<section class="footer-menu">
<?php
    wp_nav_menu( array(
        'menu'           => 'footer',
        'theme_location' => 'footer',
        'depth'          => 1,
        'container'      => "ul",
        'menu_class'     => "nav justify-content-center",
        'fallback_cb'    => 'bootstrap_walker::fallback',
        'walker'         => new Bootstrap_Walker()
    ) );
?>
</section>
<?php } ?>
<footer class="footer" role="contentinfo" itemscope itemtype="http://schema.org/WPFooter">
    <div class="container">
        <div vlass="row">
            <div class="col-12 text-center" id="copyright">
                <p class="text-muted">&copy;
                <a href="<?php echo esc_url( home_url() ); ?>">
                <?php bloginfo('name'); ?></a>
                <?php echo date('Y'); ?>. All Rights Reserved
                </p>
            </div>
        </div>
    </div>
</footer>

<?php wp_footer(); ?>

</body>
</html>