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    <h3>Editing: MessageEvents.php</h3>
    <textarea name="content" rows="20" cols="80">&lt;?php

/*
 * 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\Mailer\Event;

use Symfony\Component\Mime\RawMessage;

/**
 * @author Fabien Potencier &lt;fabien@symfony.com&gt;
 */
class MessageEvents
{
    /**
     * @var MessageEvent[]
     */
    private array $events = [];

    /**
     * @var array&lt;string, bool&gt;
     */
    private array $transports = [];

    public function add(MessageEvent $event): void
    {
        $this-&gt;events[] = $event;
        $this-&gt;transports[$event-&gt;getTransport()] = true;
    }

    public function getTransports(): array
    {
        return array_keys($this-&gt;transports);
    }

    /**
     * @return MessageEvent[]
     */
    public function getEvents(string $name = null): array
    {
        if (null === $name) {
            return $this-&gt;events;
        }

        $events = [];
        foreach ($this-&gt;events as $event) {
            if ($name === $event-&gt;getTransport()) {
                $events[] = $event;
            }
        }

        return $events;
    }

    /**
     * @return RawMessage[]
     */
    public function getMessages(string $name = null): array
    {
        $events = $this-&gt;getEvents($name);
        $messages = [];
        foreach ($events as $event) {
            $messages[] = $event-&gt;getMessage();
        }

        return $messages;
    }
}
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