The WordPress search results, by default, contain information from all available posts, pages, and custom post types. In some cases you might feel that you need to exclude certain items from the search results, because you feel that they contain irrelevant or confusing information. Today we’ll take a look at how we can achieve this.
Edit your theme’s functions.php file and paste this at the bottom.
Modify the array bit in the highlighted line, and replace the numbers with the ids of the posts, pages, or custom post types you want to exclude from the search results page.
The function above will make sure that you are executing a search in the main query outside the administration pages. It will then pass the array of ids you have entered to the post__not_in parameter of the WP_Query so they won’t be retrieved. That’s pretty much it.
If you need help finding the id of a certain item, please take a look at this article.
If you shy away from editing files, you can try using the search exclude plugin instead.