Authors-Editors

<?php
function authors_editors_shortcode() {
    $post_id = get_the_ID();
    $original_author_id = get_post_field('post_author', $post_id);
    $original_author = get_the_author_meta('display_name', $original_author_id);
    $original_author_url = get_author_posts_url($original_author_id);

    $coauthors = get_field('coauthors', $post_id);

    $content = '';
    if (!$coauthors) {
        $content .= "Written by: <a href='{$original_author_url}'>{$original_author}</a>";
    } else {
        $authors = array("<a href='{$original_author_url}'>{$original_author}</a>");
        $editors = array();

        if (have_rows('select_coauthors', $post_id)) {
            while (have_rows('select_coauthors', $post_id)) {
                the_row();
                $type = get_sub_field('type');
                $user = get_sub_field('select_user');

                if ($user) {
                    $user_name = $user['display_name'];
                    $user_url = get_author_posts_url($user['ID']);
                    $user_link = "<a href='{$user_url}'>{$user_name}</a>";

                    if ($type === 'author') {
                        $authors[] = $user_link;
                    } elseif ($type === 'editor') {
                        $editors[] = $user_link;
                    }
                }
            }
        }

        $content .= "Written by: " . implode(', ', $authors);

        if (!empty($editors)) {
            $content .= "<br>Edited by: " . implode(', ', $editors);
        }
    }

    return '<div id="authors-editors">' . $content . '</div>';
}
add_shortcode('authors_editors', 'authors_editors_shortcode');