Excluding pages from search results

When users of your site search for something, often permanent pages may appear in the search results that are, in principle, completely unnecessary in the search results and that can be excluded from search altogether. Use the pre_get_posts hook to exclude permanent pages from search results:

add_action( 'pre_get_posts', 'search_filter' );
function search_filter( $query ){

	if( ! is_admin() && $query->is_main_query() && $query->is_search ){
		$query->set( 'post_type', 'post' );
	}
}