public function getSteamID64() {
		if (PHP_INT_SIZE == 4) {
			$ret = new Math_BigInteger();
			$ret = $ret->add((new Math_BigInteger($this->universe))->bitwise_leftShift(56));
			$ret = $ret->add((new Math_BigInteger($this->type))->bitwise_leftShift(52));
			$ret = $ret->add((new Math_BigInteger($this->instance))->bitwise_leftShift(32));
			$ret = $ret->add(new Math_BigInteger($this->accountid));
			return $ret->toString();
		}
		return (string) (($this->universe << 56) | ($this->type << 52) | ($this->instance << 32) | ($this->accountid));
	}