WordPress redirect single search result

gistfile1.aw

/*If only one search result match, redirect to that page */

function kkf_singlesearch_redirect() {
    if (is_search()) {
        global $wp_query;
        if ($wp_query->post_count == 1) {
            wp_redirect( get_permalink( $wp_query->posts['0']->ID ) );
        }
    }
}

add_action('template_redirect', 'kkf_singlesearch_redirect');