MPOS / php-mpos

  private function decodeHex($hex) {

    $hex = strtoupper($hex);

    $return = "0";

    for ($i = 0; $i < strlen($hex); $i++) {

      $current = (string) strpos(self::$hexchars, $hex[$i]);

      $return = (string) bcmul($return, "16", 0);

      $return = (string) bcadd($return, $current, 0);

    }

    return $return;

  }

    $origbase58 = $base58;

    $return = "0";

    for ($i = 0; $i < strlen($base58); $i++) {

      $current = (string) strpos(Bitcoin::$base58chars, $base58[$i]);

      $return = (string) bcmul($return, "58", 0);

      $return = (string) bcadd($return, $current, 0);

    }

    $return = self::encodeHex($return);