自定义帖子类型为“projects”，分级分类为“projects\\u category”

projects
- big-corporates
-- company one
---- first project 1
---- second project 1
---- third project 1
-- company two
---- first project 2
---- second project 2
-- company three
---- first project 3
---- second project 3
---- third project 3
- small-businesses
-- company four
---- first project 4
---- etc...
-- company five
-- company six

下面是“大公司”下“projects\\u category”中列出的所有项目的列表，而我想将列表限制为“大公司”每个子类别中的一个项目。

<?php
    global $post;
    $args = array( \'post_type\' => \'projects\', \'projects_category\' => \'big-corporates\' );
    $myposts = get_posts( $args );
    foreach( $myposts as $post ) :  setup_postdata($post); ?>
        <li><a href="<?php the_permalink(); ?>" title="<?php the_title_attribute(); ?>"><?php #the_title(); ?><?php $terms = get_the_term_list( $post->ID, \'projects_category\' ); $terms = strip_tags( $terms ); echo $terms; ?></a></li>
    <?php endforeach; ?>

我正试图获得如下列表：

company one (links to first project 1)
company two (links to first project 2)
company three (links to first project 3)

我该怎么做？

//First get all child categories if \'big_corporates\'
$categories = $args = array(
    \'parent\'                   => $big_corporates_ID,
    \'orderby\'                  => \'name\',
    \'order\'                    => \'ASC\',
    \'hide_empty\'               => 1,
    \'taxonomy\'                 => \'projects_category\'
    );

//then loop over them and get the first post of each:
echo \'<ul>\';
foreach ($categories as $category) {
    $projects = get_posts(array(\'numberposts\' => 1, \'post_type\' => \'projects\', \'projects_category\' => $category->slug));
    foreach( $projects as $project ) {
        setup_postdata($project);
        ?><li><?php echo $category->name; ?> - <a href="<?php the_permalink(); ?>"><?php the_title(); ?></a></li><?php
    }
}
echo \'</ul>\';