pocketmine\utils\Binary::readByte PHP Метод

    public static function readByte($c, $signed = true)
    {
        $b = ord($c[0]);
        if ($signed) {
            if (PHP_INT_SIZE === 8) {
                return $b << 56 >> 56;
            } else {
                return $b << 24 >> 24;
            }
        } else {
            return $b;
        }
    }

 public function getByte()
 {
     return Binary::readByte($this->get(1));
 }