如何排除父类别而显示子类别？

我知道了如何在我的单篇文章视图侧栏中排除当前文章的显示，但现在我想排除父类别，只显示子类别。有什么办法吗？非常感谢！！

<div id="sidebar" class="grid_4">
<div class="item portfolio"><hr></hr>
    <h4>Similar Items</h4>
<?php
    if ( is_single() ) {
    $cats = wp_get_post_categories($post->ID);
    if ($cats) {
    $first_cat = $cats[0];
    $args=array(
      \'cat\' => $first_cat, //cat__not_in wouldn\'t work
      \'post__not_in\' => array($post->ID),
         \'showposts\'=>8,
      \'caller_get_posts\'=>1
);
    $my_query = new WP_Query($args);
    if( $my_query->have_posts() ) {
      echo \'\';
      while ($my_query->have_posts()) : $my_query->the_post(); ?>

<?php if (in_category(\'15\')) continue; ?>

<div ID="similarentry"><ul>
            <li ID="similarthmb"><?php get_the_image( array( \'custom_key\' => array( \'thumbnail\' ), \'default_size\' => \'thumbnail\', \'width\' => \'119\', \'height\' => \'75\', \'link_to_post\' => true ) ); ?></li>
            <li ID="similarttl"><a href="<?php the_permalink() ?>" rel="bookmark" title="Permanent Link to <?php the_title_attribute(); ?>"><?php the_title() ?></a></li>
        </ul></div>
       <?php
      endwhile;
    } //if ($my_query)
  } //if ($cats)
  wp_reset_query();  // Restore global post data stomped by the_post().
} //if (is_single())
?>
</div></div>

global $wp_query $twc_menu_item_object = $wp_query->object_id; //is the object id of the current page. $objects[\'menu-item-object\'] = \'\'; //the object id of the tax to display under if ( taxonomy_exists($twc_menu_item_object) && isset($objects[\'menu-item-object\']) ) { foreach ($objects[\'menu-item-object\'] as $menu_id => $menu_type) { if ( $menu_type != $twc_menu_item_object ) continue; if ( !cat_is_ancestor_of( $menu_id, $object_id ) ) continue; return true; } } return false;

<?php global $wp_query; //* first let\'s get current post parent category ID $ID = $wp_query->posts[0]->ID; //* get current post ID $postcat = get_the_category($ID); //* based on post ID, get current post categories IDs -> WP function returns array of stdClass Objects, one stdClass Object for each category; if there is child - parent relationship, first it will return Objects for children categories and than for parents -> add "print_r ($postcat);" without quotation marks in next row to see content of array $cat = $postcat[0]->cat_ID; //* get first category ID from first Object in $postcat array (if post has children categories, it will get first child ID, else it will get first category ID) $thiscat = get_category ($cat); //* get array of category objects for $cat (current) category -> add "print_r ($thiscat);" without quotation marks in next row to see content of array $parent = $thiscat->category_parent; //* and extract parent category ID; if category has no parent category (and parent category has no parent), ID = 0 //* now we have current category parent ID No, or if category has no children ID = 0 //* let\'s check if we heave categroy with children categories or not if ($parent == 0) //* if parent ID = 0, it is category without parent category {} //* do nothing else { //* else, if it has children categories $subcategories = get_categories(\'child_of=\'.$parent); //* get array of children categories Objects and $items=\'\'; //* create new ArrayObject and foreach($subcategories as $subcat) { //* foreach child category in array if($thiscat->term_id == $subcat->term_id) //* check if current category ID is same as child category ID $current = \' current-cat\'; //* if true, add current-cat to li class else $current = \'\'; //* if not, add nothing $items .= \' <li class="cat-item cat-item-\'.$subcat->term_id.$current.\'">  <a href="\'.get_category_link( $subcat->term_id ).\'" title="\'.$subcat->description.\'">\'.$subcat->name.\' (\'.$subcat->count.\' posts)</a>  </li>\'; } echo "<ul>$items</ul>"; } ?>

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