• The code below works fine in archive.php, but does not work in single.php
    How to get it to work?

    <?php $cat_ID = get_query_var('cat');?>
    <?php if (function_exists('get_highest_rated_category')): ?>
       <ul>
          <?php get_highest_rated_category($cat_ID);  ?>
       </ul>
    <?php endif; ?>

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