我有以下代码来执行foreach循环，我想以循环中的最后一个项目为目标（例如，如果它在3个事件上循环，我想以第3个事件为目标），以与css略有不同。我该怎么做？

<?php $pages = get_pages(array(\'child_of\' => $post->ID, \'sort_column\' => \'menu_order\'));
    foreach($pages as $post)
    {
    setup_postdata($post);
    $fields = get_fields();
?>
<div class="event">
    <img class="event-thumbimage" src="<?php echo $fields->thumb_image; ?>" height="120" width="140" alt="<?php echo $fields->event_title; ?>" />
    <h2><?php echo $fields->event_title; ?></h2>
    <p>
        Location: <?php echo $fields->location; ?><br />
        Start: <?php echo $fields->start_date; ?> at <?php echo $fields->start_time; ?>
        <?php $fields = get_acf(); if($fields->end_date != "") : ?>
        , End: <?php echo $fields->end_date; ?> at <?php echo $fields->end_time; ?>
        <?php else : ?>
        <?php endif; ?>
    </p>                        
    <p style="margin-bottom:0px!IMPORTANT;"><?php echo substr($fields->description,0,170) . "..."; ?></p>
    <p><a class="read-more" href="<?php echo get_page_link($post->ID); ?>" title="Read more about: <?php echo $fields->event_title; ?>">Read more...</a></p>
</div>
<?php } wp_reset_query(); ?>