find('a') as $link){
$url = $link->href;
// Check if the URL is a relative URL and add the base URL if necessary
if(substr($url, 0, 1) == "/"){
$url = $base_url . $url;
}
// Check if the URL is already in the array
if(!in_array($url, $urls)){
// Add the URL to the array
$urls[] = $url;
// If the URL is a page on the same domain, crawl it and add its URLs to the array
if(strpos($url, $base_url) !== false){
$page_content = file_get_contents($url);
$page_dom = str_get_html($page_content);
foreach($page_dom->find('a') as $page_link){
$page_url = $page_link->href;
// Check if the URL is a relative URL and add the base URL if necessary
if(substr($page_url, 0, 1) == "/"){
$page_url = $base_url . $page_url;
}
// Check if the URL is already in the array
if(!in_array($page_url, $urls)){
$urls[] = $page_url;
}
}
}
}
}
// Create an XML sitemap using SimpleXMLElement
$sitemap = new SimpleXMLElement('