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    <h3>Editing: HeaderInterface.php</h3>
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/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier &lt;fabien@symfony.com&gt;
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Component\Mime\Header;

/**
 * A MIME Header.
 *
 * @author Chris Corbyn
 */
interface HeaderInterface
{
    /**
     * Sets the body.
     *
     * The type depends on the Header concrete class.
     *
     * @param mixed $body
     */
    public function setBody($body);

    /**
     * Gets the body.
     *
     * The return type depends on the Header concrete class.
     *
     * @return mixed
     */
    public function getBody();

    public function setCharset(string $charset);

    public function getCharset(): ?string;

    public function setLanguage(string $lang);

    public function getLanguage(): ?string;

    public function getName(): string;

    public function setMaxLineLength(int $lineLength);

    public function getMaxLineLength(): int;

    /**
     * Gets this Header rendered as a compliant string.
     */
    public function toString(): string;

    /**
     * Gets the header's body, prepared for folding into a final header value.
     *
     * This is not necessarily RFC 2822 compliant since folding white space is
     * not added at this stage (see {@link toString()} for that).
     */
    public function getBodyAsString(): string;
}
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