Written by Anonymous

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;
}
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