How to effectively build a sitemap using php?

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# List URLS
$urls = array(
    'https://example.com/',
    'https://example.com/about',
    'https://example.com/contact',
    'https://example.com/products',
    'https://example.com/products/product-1',
    'https://example.com/products/product-2',
    // add more URLs as needed
);

# Create an XML document using PHP's DOM extension. 
# The XML document will serve as the sitemap file.
$doc = new DOMDocument('1.0', 'UTF-8');
$doc->formatOutput = true;

$urlset = $doc->createElement('urlset');
$urlset->setAttribute('xmlns', 'http://www.sitemaps.org/schemas/sitemap/0.9');
$doc->appendChild($urlset);

# Loop through the array of URLs and 
# add each URL as a <url> element to the XML document.

foreach ($urls as $url) {
    $urlElement = $doc->createElement('url');
    
    $locElement = $doc->createElement('loc');
    $locText = $doc->createTextNode($url);
    $locElement->appendChild($locText);
    
    $urlElement->appendChild($locElement);
    $urlset->appendChild($urlElement);
}

# Finally, save the XML document to a file on your server.
$doc->save('sitemap.xml');

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$urls = array();

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// Add homepage URL
$urls[] = 'http://example.com';

// Add blog post URLs
$posts = get_blog_posts(); // retrieve blog posts from database
foreach ($posts as $post) {
    $urls[] = 'http://example.com/blog/' . $post->slug;
}

// Add product URLs
$products = get_products(); // retrieve products from database
foreach ($products as $product) {
    $urls[] = 'http://example.com/products/' . $product->id;
}

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// Create sitemap XML document
$xml = new SimpleXMLElement('<?xml version="1.0" encoding="UTF-8" ?><urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9"></urlset>');

// Add URLs to sitemap XML document
foreach ($urls as $url) {
    $urlNode = $xml->addChild('url');
    $urlNode->addChild('loc', $url);
}

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// Save sitemap XML document to file
$xml->asXML('/path/to/sitemap.xml');

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// Submit sitemap to Google
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, "http://www.google.com/webmasters/sitemaps/ping?sitemap=http://example.com/sitemap.xml");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
$response = curl_exec($ch);
curl_close($ch);