/**
  * Replace HTML type accents in UTF-8 encoded strings, and then DE-ACCENT
  * Replace accented UTF-8 characters like by unaccented ASCII-7 equivalents
  *
  * @param STRING $string
  * @return STRING
  */
 private static function safe_charset($html)
 {
     //--
     return SmartUnicode::html_entities($html);
     //--
 }