/**
* @param string $matches
* @return string
*/
static function decodeCharReferencesCallback($matches)
{
if ($matches[1] != '') {
return Sanitizer::decodeEntity($matches[1]);
} elseif ($matches[2] != '') {
return Sanitizer::decodeChar(intval($matches[2]));
} elseif ($matches[3] != '') {
return Sanitizer::decodeChar(hexdec($matches[3]));
}
# Last case should be an ampersand by itself
return $matches[0];
}