Ben şöyle bir kod kullanıyorum
<?php
// this is where 10 headlines from the current category get printed
if ( is_single() ) :
global $post;
$categories = get_the_category();
foreach ($categories as $category) :
?>

<span id="tags"><h4><strong><?php echo $category->name; ?> </strong> kategorisinin diğer yazıları </h4></span>
<ul>
<?php
$posts = get_posts('numberposts=10&category='. $category->term_id);
foreach($posts as $post) :
?>
<li><a href="<?php the_permalink(); ?>"><?php the_title(); ?></a></li>

<?php endforeach; ?>

<li><strong><a href="<?php echo get_category_link($category->term_id);?>" title="View all posts filed under <?php echo $category->name; ?>"> '<?php echo $category->name; ?>' arsivi</a></strong></li>
</ul>

<?php endforeach; endif ; ?>

..............................
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