WordPress Version: 6.1
/**
* Checks a post's content for galleries and return the image srcs for the first found gallery.
*
* @since 3.6.0
*
* @see get_post_gallery()
*
* @param int|WP_Post $post Optional. Post ID or WP_Post object. Default is global `$post`.
* @return string[] A list of a gallery's image srcs in order.
*/
function get_post_gallery_images($post = 0)
{
$gallery = get_post_gallery($post, false);
return empty($gallery['src']) ? array() : $gallery['src'];
}