您可以在get\\u users中设置“orderby”和“who”：https://codex.wordpress.org/Function_Reference/get_users

   $usersList = get_users( \'orderby=post_count&who=authors\' );
      foreach ( $usersList as $user ) {
      echo \'<li>\' . esc_html( $user->display_name ) . \'</li>\';
  }

您始终可以使用自定义sql查询来执行类似的操作。

function custom_query(){
    global $wpdb;
    $tbl_users = $wpdb->prefix . "users";
    $tbl_posts = $wpdb->prefix . "posts";

    $sql = "SELECT ID, user_nicename FROM $tbl_users where ID in (SELECT post_author from tbl_posts WHERE post_status=\'publish\' group by post_author);";
    $results = $wpdb->get_results($sql);

    if($results){
        foreach($results as $row){
            response[] = array($row->ID, $row->user_nicename);
        }
        return response;
    }else{
        return null;
    }
}

EDIT: 我添加了这个方法，只是为了表明如果你坚持做某事，你总是可以进行自定义查询。