Implements callback_filter_process().
Provides filtering of input into accepted HTML.
function _filter_html($text, $filter) {
$allowed_tags = preg_split('/\\s+|<|>/', $filter->settings['allowed_html'], -1, PREG_SPLIT_NO_EMPTY);
$text = filter_xss($text, $allowed_tags);
if ($filter->settings['filter_html_nofollow']) {
$html_dom = filter_dom_load($text);
$links = $html_dom
->getElementsByTagName('a');
foreach ($links as $link) {
$link
->setAttribute('rel', 'nofollow');
}
$text = filter_dom_serialize($html_dom);
}
return trim($text);
}