Post Slider With CMB2 MetaBox

################
Post Slider With CMB2 metabox use.......

$about_over_image=get_post_meta($post->ID,$prefix.'about_over_image',true);

$images = get_post_meta(get_the_ID(),'slider_img',true);


<ul class="slides">
    <?php
        if(is_array($images)){
            foreach ($images as $image){
                echo '<li><img src="'.$image.'" alt="" /></li>';
            };
        }
    ?>
</ul>