/**
* Return the difference between two HTML documents.
* @param String $a The first HTML document
* @param String $b The second HTML document
* @param Boolean $describe_formatting_changes If true, changes in the formatting (for example adding a certain HTML attribute
* to a tag) are shown in text form.
* @return String An HTML document that represents the difference between the two HTML documents by assigning the class names
* diff-html-added and diff-html-removed to the changed elements.
*/
function html_diff($a, $b, $describe_formatting_changes = false)
{
$out = new ChangeText();
$htmldiffer = new HTMLDiffer(new DelegatingContentHandler($out));
$htmldiffer->htmlDiff($a, $b, $describe_formatting_changes);
return $out->toString();
}
