/**
* Gets author ID by post ID.
*
* Alternative solution: `get_post( $post_id )->post_author`
*
* @see https://wpcodebook.com/wordpress-get-author-id-by-post-id/
*/
function wpcodebook_get_post_author( $post_id ) {
return get_post_field( 'post_author', $post_id );
}