Exclude pages in WordPress search result

If you want to exclude pages in search result i WordPress you just this to your functions.php.
If you just want to search for pages instead of posts you just change ’post’ to ’page’.

function add_search_filter( $query ) {
	if ( $query->is_search ) {
		$query->set('post_type', 'post');
	}
	return $query;
}
add_filter('pre_get_posts', 'add_search_filter');