Change tag attribute value with PHP DOMDocument

Question

I want to change the value of the attribute of a tag with PHP DOMDocument.

For example, say we have this line of HTML:

Answer 1

$dom = new domDocument;
$dom->loadHTML('Click here');

$elements = $dom->getElementsByTagName( 'a' );

if($elements instanceof DOMNodeList)
    foreach($elements as $domElement)
        $domElement->setAttribute('href', 'http://www.google.com/');