PHP - if element present or exist

Question

<?php if (!empty($filter['combine'])):?>
  <h1 class="page-heading">Latest news for:
  <strong id="search-for"><?php echo $filter['combine'];?></strong>
  </h1>
<?php else:?>
  <h1 class="page-heading"><strong id="search-for"><?php echo $category_name;?></strong>
  </h1>
<?php endif;?>