Fetching Guest Author Meta | WordPress.org

Hi Jones 🙂

I have created a section to fetch guest authors name, image(avatar/custom) and bio to fetch below my blog post article, but unfortunately only name is coming accurately, can you please suggest what should I do in order to fetch all accurately. Thanks : )
Here is the code I tried

<?php
						global $post;

						$post_author_name="";

						if (function_exists('sgan_get_guest_author_name')) {
							$guest_author_name = sgan_get_guest_author_name($post->ID);
							if (!empty($guest_author_name)) {
								$post_author_name = $guest_author_name;
							}
						}

						if (empty($post_author_name)) {
							$post_author_id = $post->post_author;
							$post_author_data = get_userdata($post_author_id);
							if ($post_author_data) {
								$post_author_name = get_the_author($post_id);
							}
						}

						$author_bio = '';

						if (!empty($post_author_id)) {
							$author_bio = get_the_author_meta('description', $post_author_id);
						}

						if (!empty($post_author_name)) {
							$author_image_url = get_avatar_url($post_author_id);
						?>