<nav id="mobile-nav">
    <div>
        <ul>
            <?php foreach($global_cats as $index => $cat): ?>
                <li>
                    <a href="/category/<?php echo e($cat->slug); ?>"><?php echo e($cat->title); ?></a>
                    <ul>
                        <?php foreach($cat->sub_categories as $sub_cat): ?>
                            <li><a href="/category/<?php echo e($cat->slug); ?>/<?php echo e($sub_cat->slug); ?>"><?php echo e($sub_cat->title); ?></a></li>
                        <?php endforeach; ?>
                    </ul>
                </li>
            <?php endforeach; ?>
        </ul>
    </div>
</nav>