好的，我会再详细一点。我用这个代码得到了一个按字母排序的艺术家列表。在这个列表中，我展示了这个艺术家术语对应的所有新闻帖子。功能正常。但是，如果有一条新闻与不止一位艺术家对应，那么我会在与该帖子对应的每一位艺术家下面得到相同的帖子。我想做的是为第一位与这篇文章相对应的艺术家展示这篇文章/新闻。而不是为列表中的每个艺术家多次显示帖子。显示的代码用于列出艺术家并显示下面相应的帖子。提前感谢，并对之前不可靠的描述表示抱歉。

<?php foreach ( $artist_terms as $artist_term ): ?>

    <?php $news = get_posts(array (
    \'numberposts\' => 0, 
    \'order\' => \'DESC\', 
    \'meta_key\' => \'date\', 
    \'value\' => \'date(yyyy-mm-dd)\', 
    \'orderby\' => \'meta_value\',  
    \'post_type\' => \'news\', 
    \'artist\' => $artist_term->slug
    ));
    ?>

    <? if($news): ?>

        <li>
            <?php foreach ($news as $post) : ?>

                        <div>   
                            <?php the_post_thumbnail();?>
                            <?php $artist_name = strip_tags (get_the_term_list( get_the_ID(), \'artist\')); echo $artist_name; ?>
                        </div>      

            <?php endforeach; ?>        
        </li>

    <?php endif; ?>
<?php endforeach; ?>

这个代码的替代品我找到了这个http://wordimpress.com/loop-through-categories-and-display-posts-within/. 这也是一样的，但对于重复项也没有解决方案。

<?php
/*
 * Loop through Categories and Display Posts within
 */
$post_type = \'news\';

// Get all the taxonomies for this post type
$taxonomies = get_object_taxonomies( array( \'post_type\' => $post_type ) );

foreach( $taxonomies as $taxonomy ) :

    // Gets every "category" (term) in this taxonomy to get the respective posts
    $terms = get_terms( $taxonomy );

    foreach( $terms as $term ) : ?>

      <?php// echo $term->name; ?>

     <?php $ids = array(); 
         $ids[] = get_the_ID();
     ?>

        <?php
        $args = array(
                \'post_type\' => $post_type,
                \'posts_per_page\' => -1,  //show all posts
                \'tax_query\' => array(
                    array(
                        \'taxonomy\' => $taxonomy,
                        \'field\' => \'slug\',
                        \'terms\' => $term->slug,
                        \'post__not_in\' => $ids
                    )
                )

            );
        $posts = new WP_Query($args);

        if( $posts->have_posts() ): while( $posts->have_posts() ) : $posts->the_post(); ?>

            <?php
        $args2 = array(
                \'post_type\' => $post_type,
                \'posts_per_page\' => -1,  //show all posts
                \'tax_query\' => array(
                    array(
                        \'taxonomy\' => $taxonomy,
                        \'field\' => \'slug\',
                        \'terms\' => $term->slug,
                        \'post__not_in\' => $ids
                    )
                )

            );
        $posts2 = new WP_Query($args2); ?>



                    <?php if(has_post_thumbnail()) { ?>
                            <?php the_post_thumbnail(); ?>
                            <br>

                    <?php }
                    /* no post image so show a default img */
                    else { ?>
                           <img src="<?php bloginfo(\'template_url\'); ?>/assets/img/default-img.png" alt="<?php echo get_the_title(); ?>" title="<?php echo get_the_title(); ?>" width="110" height="110" />
                    <?php } ?>
                    <br>
                   <?php  echo get_the_title(); ?>
                   <br><br><br>


        <?php endwhile; endif; ?>

    <?php endforeach;

endforeach; ?>

add_filter( \'posts_groupby\', \'my_posts_groupby\' );
function my_posts_groupby($groupby) {
    global $wpdb;
    $groupby = "{$wpdb->posts}.ID";
    return $groupby;
}