BİZE YAZANLAR
$authors = $wpdb->get_results('SELECT DISTINCT post_author FROM '.$wpdb->posts);
if($authors){
$users = get_users( array(
'include' => $authors,
'orderby' => 'display_name'
));
foreach ((array)$users as $user) {
echo '' . $user->display_name. ' ';
}
}