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Editing: SMimePart.php

<?php

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

namespace Symfony\Component\Mime\Part;

use Symfony\Component\Mime\Header\Headers;

/**
 * @author Sebastiaan Stok <s.stok@rollerscapes.net>
 */
class SMimePart extends AbstractPart
{
    /** @internal */
    protected Headers $_headers;

private iterable|string $body;
    private string $type;
    private string $subtype;
    private array $parameters;

public function __construct(iterable|string $body, string $type, string $subtype, array $parameters)
    {
        parent::__construct();

$this->body = $body;
        $this->type = $type;
        $this->subtype = $subtype;
        $this->parameters = $parameters;
    }

public function getMediaType(): string
    {
        return $this->type;
    }

public function getMediaSubtype(): string
    {
        return $this->subtype;
    }

public function bodyToString(): string
    {
        if (\is_string($this->body)) {
            return $this->body;
        }

$body = '';
        foreach ($this->body as $chunk) {
            $body .= $chunk;
        }
        $this->body = $body;

return $body;
    }

public function bodyToIterable(): iterable
    {
        if (\is_string($this->body)) {
            yield $this->body;

return;
        }

$body = '';
        foreach ($this->body as $chunk) {
            $body .= $chunk;
            yield $chunk;
        }
        $this->body = $body;
    }

public function getPreparedHeaders(): Headers
    {
        $headers = clone parent::getHeaders();

$headers->setHeaderBody('Parameterized', 'Content-Type', $this->getMediaType().'/'.$this->getMediaSubtype());

foreach ($this->parameters as $name => $value) {
            $headers->setHeaderParameter('Content-Type', $name, $value);
        }

return $headers;
    }

public function __sleep(): array
    {
        // convert iterables to strings for serialization
        if (is_iterable($this->body)) {
            $this->body = $this->bodyToString();
        }

$this->_headers = $this->getHeaders();

return ['_headers', 'body', 'type', 'subtype', 'parameters'];
    }

public function __wakeup(): void
    {
        $r = new \ReflectionProperty(AbstractPart::class, 'headers');
        $r->setValue($this, $this->_headers);
        unset($this->_headers);
    }
}

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