将作者的 Wordpress 帖子网格（最新帖子）添加到自定义帖子类型

Question

I have created a custom post type called Professionals. I am using the Divi Theme Builder to display each professional with their own dynamic content (using advanced custom fields). At the bottom of each professional's page, I would like to add a divi blog module showing 3 of their most recent blog posts. Here's what I have so far - but nothing is showing on the page.

function add_author_recent_posts() {
    $author = get_the_author(); // defines your author ID if it is on the post in question
    $args = array(
                 'post_type' => 'professionals',
                 'post_status' => 'publish',
                 'author'=>$author,
                 'posts_per_page' => 3, // the number of posts you'd like to show
                 'orderby' => 'date',
                 'order' => 'DESC'
                 );
     $results = new WP_Query($args);
    while ($results->have_posts()) {
      $results->the_post();
      the_title();
      echo '</hr>'; // puts a horizontal line between results if necessary 
    }
}
add_action( 'init', 'add_author_recent_posts' );

Answer 1

The problem is where you're calling the get_the_author function. You've added it on init hook, and at this point, the Author returned will be none:

function add_author_recent_posts() {
    $author = get_the_author();
    echo $author; die;
}
add_action( 'init', 'add_author_recent_posts' );

So, I'll suggest you to place it on the_content filter, appending yours posts to the original content:

function add_author_recent_posts($content) {
  $author = get_the_author();
  $args = array(
               'post_type' => 'post',
               'post_status' => 'publish',
               'author'=>$author,
               'posts_per_page' => 3, 
               'orderby' => 'date',
               'order' => 'DESC'
               );
   $results = new WP_Query($args);
  while ($results->have_posts()) {
    $results->the_post();
    $content .= get_the_title();
    $content .= '</hr>'; 
  }
  return $content;
}
add_filter( 'the_content', 'add_author_recent_posts' );