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<?php
//* Do NOT include the opening php tag shown above. Copy the code shown below.

<!-- 
Want to automatically add a search box to your nav? Here’s how: 
-->

add_filter('wp_nav_menu_items','add_search_box', 10, 2);
function add_search_box($items, $args) {
 
        ob_start();
        get_search_form();
        $searchform = ob_get_contents();
        ob_end_clean();
 
        $items .= '<li>' . $searchform . '</li>';
 
    return $items;
}