voku / portable-utf8

      return \iconv_strpos($haystack, $needle, $offset > 0 ? $offset : 0, $encoding);

    }

    if (self::$support['intl'] === true) {

      $returnTmp =  \grapheme_strpos($haystack, $needle, $offset);

      if ($returnTmp !== false) {

        return $returnTmp;

      }

    }

    // fallback via vanilla php

      return \mb_strripos($haystack, $needle, $offset, $encoding);

    }

    if (self::$support['intl'] === true) {

      $returnTmp =  \grapheme_strripos($haystack, $needle, $offset);

      if ($returnTmp !== false ) {

        return $returnTmp;

      }

    }

    return self::strrpos(self::strtolower($haystack, $encoding), self::strtolower($needle, $encoding), $offset, $encoding, $cleanUtf8);

  }

      return \mb_strrpos($haystack, $needle, $offset, $encoding);

    }

    if (self::$support['intl'] === true) {

      $returnTmp = \grapheme_strrpos($haystack, $needle, $offset);

      if ($returnTmp !== false ) {

        return $returnTmp;

      }

    }

    // fallback via vanilla php