sample-event.php

<?php

final class SampleEvent
{
    private $id;
    private $Email;
    
    public function __construct(UserId $id, Email $email)
    {
        $this->name = $name;
        $this->email = $email;
    }
    
    public function id()
    {
        return $this->id;
    }
    
    public function email()
    {
        return $this->email;
    }
}

$sample_event = new SampleEvent(new UserId(1), new Email('[email protected]'));
$event = serialize($sample_event);