Why doesn't url_to_postid work or how to get the id of the next post in the list?

Question

WordPress

https://wp-kama.ru/function/url_to_postid

Hello!
There is a code:

$url = next_post_link();
$post_ID = url_to_postid($url);

Why does url_to_postid return 0?

And if you pass in url_to_postid not next_post_link but just a string link, then everything works.

Or how to get the id of the next post in the list?

Answer 1

Or how to get the id of the next post in the list?

get_next_post ?