How to exclude a post in WordPress by its ID?

Question

WordPress

The post displays the "Related Pages" block. This block shows links to posts that are in the same category as the post itself. I need to exclude the link to this post so that the page doesn't link to itself.
I'm trying to exclude a post of a certain category like this:

$arg = array (
    'cat' => 54, // выводить посты из этой категории
    'post__not_in' => 2197, // исключить конкретный пост
    'posts_per_page' => 10, // сколько постов выводить
    'orderby' => rand // рандомно
);

For some reason, the line does not work, the post (record) IDs are exactly the same as I set. Where is the mistake? post__not_in => 2197

Answer 1

Try throwing an array there

$arg = array (
    'cat' => 54, // выводить посты из этой категории
    'post__not_in' => array(2197), // исключить конкретный пост
    'posts_per_page' => 10, // сколько постов выводить
    'orderby' => rand // рандомно
);