In what scenarios would using a DOM parser like DOMDocument or simplehtmldom be more advantageous than manually parsing HTML strings in PHP?

Using a DOM parser like DOMDocument or simplehtmldom in PHP is more advantageous than manually parsing HTML strings when dealing with complex HTML structures or when you need to extract specific elements or attributes from the HTML document. DOM parsers provide a more robust and reliable way to navigate and manipulate the HTML document compared to manual string parsing.

// Example using DOMDocument to parse HTML
$html = '<html><body><h1>Hello, World!</h1></body></html>';

$dom = new DOMDocument();
$dom->loadHTML($html);

$heading = $dom->getElementsByTagName('h1')[0]->nodeValue;
echo $heading;