Post.php

<?php

class PostAggregateRoot
{
    public function publishPost(DateTime $when) {
        $this->recordThat(new PostPublishScheduled($when));

        if ($when < now()) {
            $this->recordThat(new PostPublished());
        }

        return $this;
    }

    public function publishPostNow()
        $this->recordThat(new PostPublished());

        return $this;
    )
}