wpseo_author_archive_post_types.php

<?php
/********* DO NOT COPY THE PARTS ABOVE THIS LINE *********/

/* Include authors of CPTs in the Yoast author sitemap
 * Credit: Yoast team
 * Last Tested: Jan 29 2024 using Yoast SEO 21.9.1 on WordPress 6.4.2
 * For optimial SEO, please ensure that CPT posts are included in the core author archive output
 * Example: https://wpdevdesign.com/how-to-add-cpt-entries-in-author-archives/
 */

add_filter( 'wpseo_author_archive_post_types', 'yoast_seo_sitemap_add_cpt_authors');

function yoast_seo_sitemap_add_cpt_authors ( $currentPostTypes ) {
	$addPostTypes = []; // Do not remove this line
	
	array_push( $addPostTypes, "book" ); // Repeat to add another post type
	array_push( $addPostTypes, "movie" ); // Repeat to add another post type
	
	//Do not remove the lines below
	$newPostTypeArray = array_unique( array_merge( $currentPostTypes, $addPostTypes ));
	return $newPostTypeArray;
}