Modify post_types searched

gistfile1.aw

<?php

add_action( 'pre_get_posts', 'localtv_posts_and_pages_for_search' );

function localtv_posts_and_pages_for_search( $query ) {
	if ( $query->is_main_query() && $query->is_search() )
		$query->set( 'post_type', array( 'post', 'page' ) );
}