Cleaning an html fragment (OO support seems to half-arsed for now)
This will ensure all tags are closed, without adding any html/head/body tags around it.
<?php
$tidy_config = array(
'clean' => true,
'output-xhtml' => true,
'show-body-only' => true,
'wrap' => 0,
);
$tidy = tidy_parse_string($html_fragment, $tidy_config, 'UTF8');
$tidy->cleanRepair();
echo $tidy;
?>