voku / portable-utf8

      $encoding = self::normalize_encoding($encoding, 'UTF-8');

    }

    if (

        $encoding !== 'UTF-8'

        &&

        $encoding !== 'ISO-8859-1'

        &&

        $encoding !== 'WINDOWS-1252'

        &&

        self::$SUPPORT['mbstring'] === false

    ) {

      \trigger_error('UTF8::chr() without mbstring cannot handle "' . $encoding . '" encoding', E_USER_WARNING);

    }

    $cacheKey = $code_point . $encoding;

    if (isset($CHAR_CACHE[$cacheKey]) === true) {

        return self::to_iso8859($str);

      }

      if (

          $encoding !== 'UTF-8'

          &&

          $encoding !== 'ISO-8859-1'

          &&

          $encoding !== 'WINDOWS-1252'

          &&

          self::$SUPPORT['mbstring'] === false

      ) {

        \trigger_error('UTF8::encode() without mbstring cannot handle "' . $encoding . '" encoding', E_USER_WARNING);

      }

      $strEncoded = \mb_convert_encoding(

          $str,

      $flags = ENT_QUOTES | ENT_HTML5;

    }

    if (

        $encoding !== 'UTF-8'

        &&

        $encoding !== 'ISO-8859-1'

        &&

        $encoding !== 'WINDOWS-1252'

        &&

        self::$SUPPORT['mbstring'] === false

    ) {

      \trigger_error('UTF8::html_entity_decode() without mbstring cannot handle "' . $encoding . '" encoding', E_USER_WARNING);

    }

    do {

      $str_compare = $str;