Exclude a (Custom) Post Type from WordPress Search Result

WP-exclude-from-search

/* put function in functions.php */

function exclude_from_search() {
    global $wp_post_types;
    /* exclude pages from search result */
    $wp_post_types['page']->exclude_from_search = true;
    /* exclude posts from search result */
    $wp_post_types['post']->exclude_from_search = true;
    /* exclude another custom post type from search result */
    $wp_post_types['name-of-custom-post-type']->exclude_from_search = true;
}
add_action('init', 'exclude_from_search');