cx-newsletter/converters/2-messages_converter.php

<?php

namespace cx_newsletter;

class messages_converter
extends database_converter
implements database_converter_interface {
    public function get_array() : array {
        $this->check_target();

        $result = [];
        $result['title'] = $this->target->title;
        $result['content'] = base64_encode($this->target->content);

        if ($this->target->has_id()) {
            $result['id'] = $this->target->get_id();
        }

        return $result;
    }

    public function load_array(array $target) : self {
        $this->check_all_exists($target, [ 'title', 'content' ]);

        $this->target = new message($this->id_or_null($target));
        $this->target->title = $target['title'];
        $this->target->content = base64_decode($target['content']);

        return $this;
    }
}