php if get_post_meta post- ID postreaction true div class article_reac

<?php if (get_post_meta($post->ID, 'postreaction', true)) { ?>
  <div class="article_reaction">
    <div class="label-reaction"><span><?php echo get_post_meta($post->ID, 'postreaction', true); ?></span></div>
  </div><!-- /.article_reaction -->
<?php } ?>