FeedServiceProvider for custom xml and json feed (acorn, wordpress, laravel)

FeedServiceProvider.php

<?php

declare(strict_types=1);

namespace App\Providers;

use DOMDocument;
use Illuminate\Support\ServiceProvider;

class FeedServiceProvider extends ServiceProvider
{
    /**
     * Register assets services.
     */
    #[\Override]
    public function register(): void
    {
        parent::register();

        add_action(
            hook_name: 'init',
            callback: $this->addCustomFeed(...),
            priority: 10,
            accepted_args: 2
        );
        add_filter(
            hook_name: 'feed_content_type',
            callback: $this->customFeedContentType(...),
            priority: 10,
            accepted_args: 2
        );
    }

    public function addCustomFeed(): void
    {
        add_feed('customJson', $this->renderCustomJsonFeed(...));
        add_feed('customXml', $this->renderCustomXmlFeed(...));
    }


    public function customFeedContentType($content_type, $type): string
    {
        return match ($type) {
            'customJson' => 'application/json',
            'customXml' => 'application/rss+xml',
            default => $content_type,
        };
    }

    public function renderCustomJsonFeed(): void
    {
        $feedItems = collect(
            get_posts(
                [
                    'post_type' => 'post',
                    'posts_per_page' => 10,
                ]
            )
        );
        echo $feedItems->toJson();
    }

    public function renderCustomXmlFeed(): void
    {
        $feedItems = collect(
            get_posts([
                'post_type' => 'post',
                'posts_per_page' => 10,
            ])
        );
        $dom = new DOMDocument('1.0', 'UTF-8');

        $rss = $dom->createElement('rss');
        $rss->setAttribute('version', '2.0');

        $channel = $dom->createElement('channel');

        foreach ($feedItems as $item) {
            $title = $dom->createElement('title', htmlspecialchars($item->post_title));
            $link = $dom->createElement('link', get_permalink($item->ID));
            $description = $dom->createElement('description', htmlspecialchars($item->post_excerpt));

            $itemElement = $dom->createElement('item');
            $itemElement->appendChild($title);
            $itemElement->appendChild($link);
            $itemElement->appendChild($description);

            $channel->appendChild($itemElement);
        }

        $rss->appendChild($channel);
        $dom->appendChild($rss);

        echo $dom->saveXML();
    }

}