我试图从基于函数的类别列表中排除类别。我在这里浏览和研究了很多，但找不到解决方案。下面是我在侧边栏中使用的代码：

 <ul class="side-cat-img"> <li> 
<?php $args = array();
$args[\'show_last_updated\'] = true;
$args[\'show_count\'] = true;
$args[\'title_li\'] = \'\';
$args[\'walker\'] = new CategoryThumbnail_Walker;

wp_list_categories($args); ?>
</li>  
</ul> 

我想排除几个类别，所以我使用了以下代码：

<?php wp_list_categories(\'exclude=4,7&title_li=\'); ?>

结果：类别确实被排除，但功能不再正常工作。

该函数应拉出每个类别的屏幕盖以显示。一旦我排除了类别，屏幕截图就不再显示了。

以下是功能代码：

class CategoryThumbnail_Walker extends Walker_Category {

    // A new element has been stumbled upon and has ended
    function end_el( &$output, $category, $depth, $args ) {
        // Output the standard link ending
        parent::end_el( &$output, $category, $depth, $args );

        // Get one post
        $posts = get_posts( array(
            // ...from this category
            \'category\' => $category->cat_ID,
            \'numberposts\' => 10
        ) );

        // we\'ll record the seen images here
        if ( !isset($this->images_seen) ) $this->images_seen = array();

        foreach ( $posts as $post ) {
            // Get its thumbnail and append it to the output
            $featured = get_the_post_thumbnail( $post->ID, \'latestpost-thumb\', null );
            // have we already seen this image?
            if ( in_array($featured, $this->images_seen) ) continue;
            else {
                $this->images_seen []= $featured;
 $post_cats = get_the_category($post->ID);
$output .= \'<li><a href="http://zoomingjapan.com/category/\'.$post_cats[0]->slug.\'" title="Category Name">\'.$featured.\'</a></li>\'; 
                break;
            }
        }
    }
}

你知道我如何修改代码以排除类别而不破坏函数的功能吗？

提前多谢！

<?php wp_list_categories(\'exclude=4,7&title_li=\'); ?>

$args = array();
$args[\'show_last_updated\'] = true;
$args[\'show_count\'] = true;
$args[\'title_li\'] = \'\';
$args[\'exclude\'] = \'4,7\';
$args[\'walker\'] = new CategoryThumbnail_Walker;

wp_list_categories($args);