MultipleHeadersInterface.php

<?php
/**
 * @see       https://github.com/zendframework/zend-mail for the canonical source repository
 * @copyright Copyright (c) 2005-2018 Zend Technologies USA Inc. (https://www.zend.com)
 * @license   https://github.com/zendframework/zend-mail/blob/master/LICENSE.md New BSD License
 */

namespace Zend\Mail\Header;

interface MultipleHeadersInterface extends HeaderInterface
{
    public function toStringMultipleHeaders(array $headers);
}