What are some common methods for converting HTML content into an RSS feed in PHP?

Converting HTML content into an RSS feed in PHP involves parsing the HTML content and extracting relevant information such as title, description, and link for each item. One common method is to use a library like SimpleHTMLDOM to parse the HTML content and then create an RSS feed using the SimpleXMLElement class in PHP.

// Load the SimpleHTMLDOM library
include('simple_html_dom.php');

// Load the HTML content from a file or URL
$html = file_get_html('http://example.com/page.html');

// Create a new RSS feed
$rss = new SimpleXMLElement('<rss version="2.0"></rss>');
$channel = $rss->addChild('channel');
$channel->addChild('title', 'RSS Feed Title');
$channel->addChild('link', 'http://example.com');

// Parse the HTML content and extract relevant information for each item
foreach($html->find('div.item') as $item) {
    $title = $item->find('h2', 0)->plaintext;
    $description = $item->find('p', 0)->plaintext;
    $link = $item->find('a', 0)->href;

    $item = $channel->addChild('item');
    $item->addChild('title', $title);
    $item->addChild('description', $description);
    $item->addChild('link', $link);
}

// Output the RSS feed
header('Content-Type: text/xml');
echo $rss->asXML();