将帖子类别输出为班级 [英] Outputting a posts categories as a class

问题描述

我现有的代码输出投资组合类别中的所有帖子，但是我还想向该帖子所涉及的类别填充的每个项目中添加一个类。我尝试使用get_the_category并认为我已经快到了，但无法解决我尚未完全正确的操作：

My existing code outputs all posts in the portfolio category, however I want to also add a class to each item that is populated by the categories the post relates to. I've tried using get_the_category and think i'm nearly there but can't work out what I haven't quite done correct:

    <?php query_posts('category_name=portfolio&order=DSC&orderby=ID&posts_per_page=20'); 
        if (have_posts()) : while (have_posts()) : the_post(); ?>
        <?php 
          $portfolio_link = get_post_meta($post->ID, 'portfolio_link', true); 
          $categories = get_the_category($postID);
        ?>
        <li class="<?php echo $categories->cat_name;?>">
         <?php if ($portfolio_link) { echo "<a href='$portfolio_link'>"; } ?>
           <?php the_post_thumbnail('small'); ?>
          <?php if ($portfolio_link) { echo "</a>"; } ?>
        </li>
     <?php endwhile; endif; wp_reset_query();?>

目前根本没有输出任何类，但也没有显示错误！

At the moment no classes are output at all, but no errors are shown either!

推荐答案

get_the_category（）返回一个数组，因此您需要对其进行迭代。

get_the_category() returns an array so you need to iterate over it.

$catNames = array();
foreach($categories as $category) {

    $catNames[] = $category->cat_name;
}

$classes = implode(' ', $catNames);
<li class="<?php echo $classes ?>">

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