非常感谢你。与此同时，我发现了如何解决。我当前的代码如下：

class CustomSearch
{
  public function __construct()
  {
    add_action(\'init\', array($this, \'init\'));
    add_shortcode(\'custom_search\', array($this, \'shortcode_handler\'));
  }

  public function init()
  {
    if (!empty($_POST[\'nonce_custom_form\']))
    {
      if (!wp_verify_nonce($_POST[\'nonce_custom_form\'], \'handle_custom_form\'))
      {
        die(\'You are not authorized to perform this action.\');
      } else
      {
        $error = null;
        if (empty($_POST[\'workingLanguage\']) && empty($_POST[\'workingArea\']) )
        {
          $error = new WP_Error(\'empty_error\', __(\'Please enter search request.\', \'floh\'));
          wp_die($error->get_error_message(), __(\'CustomSearch Error\', \'floh\'));
        }
        else
        {
          $rd_args = array(
            \'post_type\' => \'page\',
            \'meta_query\' => array(
              \'relation\' => \'AND\',
              array(
                \'key\' => \'name\',
                \'value\' => $_POST[\'name\'],
                \'compare\' => \'LIKE\'
              ),
              array(
                \'key\' => \'email\',
                \'value\' => $_POST[\'email\'],
                \'compare\' => \'LIKE\'
              )
            )
          );
          $rd_query = new WP_Query( $rd_args );

          $posts = $rd_query->posts;

          // The Loop
          if( $rd_query->have_posts() ) {
            echo \'<ul>\';
            while ( $rd_query->have_posts() ) {
              $rd_query->the_post();
              echo \'<li>\'.get_the_title().\'</li>\';
            }
            echo \'</ul>\';
          } else {
            // no posts found
          }
        }
      }
    }
  }

  function shortcode_handler($atts)
  {
    return "<form method=\'post\' action=\'\'>
      <p>Name: <input name=\'name\' type=\'text\' value=\'\' /></p>
      <p>eMail: <input name=\'email\' type=\'text\' value=\'\' /></p>
      " . wp_nonce_field(\'handle_custom_form\', \'nonce_custom_form\') . "
      <input type=\'submit\' value=\'Submit\'/>
      </form>";
  }

}

$CustomSearch = new CustomSearch();

现在，我必须了解如何将列表附加到表单下方的searchpage。或者更好的是，如何将结果$rd\\U结果“发送”到默认搜索页面？

更新：我学会了使用return而不是echo，这样输出的顺序就正确了。（我不知道为什么我开始使用echo）

最佳regardsFloh