WordPress: ACF - Output Gallery

acf-gallery.php

<?php 
            $images = get_field('gallery');
 
            if( $images ): ?>
                <div id="slider" class="flexslider">
                    <ul class="slides">
                        <?php foreach( $images as $image ): ?>
                            <li>
                                <img src="<?php echo $image['url']; ?>" alt="<?php echo $image['alt']; ?>" />
                                <p><?php echo $image['caption']; ?></p>
                            </li>
                        <?php endforeach; ?>
                    </ul>
                </div>
            <?php endif; ?>