How to create a sitemap in cakephp?

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composer require dereuromark/cakephp-sitemap

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Plugin::load('CakeSitemap');

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<?php
namespace AppController;

use CakeSitemapSitemapSitemap;
use CakeSitemapSitemapSitemapIndex;
use CakeSitemapDatasourceSitemapSource;

class SitemapController extends AppController
{
    public function initialize()
    {
        parent::initialize();
        $this->loadComponent('RequestHandler');
    }

    public function index()
    {
        $sitemap = new Sitemap();
        $sitemap->addUrl(['url' => '/', 'changefreq' => 'daily', 'priority' => '1.0']);

        $this->set(compact('sitemap'));
        $this->set('_serialize', ['sitemap']);
    }

    public function sitemap()
    {
        $sitemap = new Sitemap();
        $sitemapSource = new SitemapSource();
        $urls = $sitemapSource->getUrls();

        foreach ($urls as $url) {
            $sitemap->addUrl($url);
        }

        $this->response->type('xml');
        $this->set(compact('sitemap'));
        $this->set('_serialize', ['sitemap']);
    }

    public function sitemapIndex()
    {
        $sitemapIndex = new SitemapIndex();

        $sitemapIndex->addSitemap(['url' => ['controller' => 'Sitemap', 'action' => 'sitemap']]);

        $this->response->type('xml');
        $this->set(compact('sitemapIndex'));
        $this->set('_serialize', ['sitemapIndex']);
    }
}

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<?= $this->Xml->header() ?>
<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
    <?php foreach ($sitemap->getUrls() as $url): ?>
        <url>
            <loc><?= h($url['url']) ?></loc>
            <lastmod><?= $this->Time->format($url['lastmod'], 'W3C') ?></lastmod>
            <?php if (isset($url['changefreq'])): ?>
                <changefreq><?= h($url['changefreq']) ?></changefreq>
            <?php endif ?>
            <?php if (isset($url['priority'])): ?>
                <priority><?= h($url['priority']) ?></priority>
            <?php endif ?>
        </url>
    <?php endforeach ?>
</urlset>

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<?= $this->Xml->header() ?>
<sitemapindex xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
    <?php foreach ($sitemapIndex->getSitemaps() as $sitemap): ?>
        <sitemap>
            <loc><?= $this->Url->build($sitemap['url'], true) ?></loc>
        </sitemap>
    <?php endforeach ?>
</sitemapindex>

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<?php
namespace AppModelDatasource;

use Cake

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public function sitemap() {
    // your code to generate the sitemap
}

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Router::connect('/sitemap.xml', array('controller' => 'your_controller', 'action' => 'sitemap'));

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public function sitemap() {
    $this->autoRender = false;

    App::uses('Xml', 'Utility');
    $xml = Xml::build('<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9"></urlset>');

    // add URLs to the sitemap
    $url = $xml->addChild('url');
    $url->addChild('loc', Router::url(array('controller' => 'pages', 'action' => 'home'), true));
    $url->addChild('changefreq', 'daily');
    $url->addChild('priority', '1.0');

    // add more URLs ...

    // output the sitemap
    $this->response->type('xml');
    $this->response->body($xml->asXML());
}