If there are posts with this ID, then... and if not, then... WordPress, how?

Question

WordPress

Good day!
Please tell me how to make such a filter in WordPress posts:
if there are posts with such IDs, then show this ad unit, if not, then another one.
In simple words:
In some posts, the place of the adsense block is to show another ad...
Thank you very much in advance

Answer 1

Conditional Tags
For example, in single.php where you show ads:

<?php
$page_ids = array( 11, 34, 76, 237 ); // ID постов
if( is_single( $page_ids ) ) {
    // тут показываем рекламу которая нужна на страницах этих постов
} else {
    // тут показываем рекламу для всех остальных постов
}