4 * Post-transform that copies lang's value to xml:lang (and vice-versa)
5 * @note Theoretically speaking, this could be a pre-transform, but putting
6 * post is more efficient.
8 class HTMLPurifier_AttrTransform_Lang extends HTMLPurifier_AttrTransform
11 public function transform($attr, $config, $context) {
13 $lang = isset($attr['lang']) ? $attr['lang'] : false;
14 $xml_lang = isset($attr['xml:lang']) ? $attr['xml:lang'] : false;
16 if ($lang !== false && $xml_lang === false) {
17 $attr['xml:lang'] = $lang;
18 } elseif ($xml_lang !== false) {
19 $attr['lang'] = $xml_lang;